feat(issue-#155): rename plugin module to meta (#156)

* feat(issue-#155): rename  module plugin to meta

* feat: remove unused md file

* refactor: rename plugin module to meta

* fix: trigger document error

* fix: code checkstyle

meta/build.gradle

@@ -0,0 +1,7 @@
+dependencies {
+    testImplementation 'mysql:mysql-connector-java:8.0.27'
+    implementation 'org.commonmark:commonmark:0.18.1'
+    implementation 'org.freemarker:freemarker:2.3.31'
+    testImplementation "com.fasterxml.jackson.core:jackson-core:${jacksonVersion}"
+    testImplementation "com.fasterxml.jackson.core:jackson-databind:${jacksonVersion}"
+}

meta/src/main/java/com/databasir/core/Databasir.java

@@ -0,0 +1,50 @@
+package com.databasir.core;
+
+import com.databasir.core.meta.data.DatabaseMeta;
+import com.databasir.core.meta.provider.MetaProviders;
+import com.databasir.core.meta.provider.condition.Condition;
+import com.databasir.core.render.Render;
+import com.databasir.core.render.RenderConfig;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.sql.Connection;
+import java.util.Optional;
+
+@RequiredArgsConstructor
+@Getter
+public class Databasir {
+
+    private final DatabasirConfig config;
+
+    public Optional<DatabaseMeta> get(Connection connection, String databaseName, String schemaName) {
+        Condition condition = Condition.builder()
+                .databaseName(databaseName)
+                .schemaName(schemaName)
+                .ignoreTableNameRegex(config.getIgnoreTableNameRegex())
+                .ignoreTableColumnNameRegex(config.getIgnoreTableColumnNameRegex())
+                .build();
+        return MetaProviders
+                .of(connection)
+                .select(connection, condition);
+    }
+
+    public void renderAsMarkdown(DatabaseMeta meta, OutputStream out) throws IOException {
+        renderAsMarkdown(new RenderConfig(), meta, out);
+    }
+
+    public void renderAsMarkdown(RenderConfig config, DatabaseMeta meta, OutputStream stream) throws IOException {
+        Render.markdownRender(config).rendering(meta, stream);
+    }
+
+    public static Databasir of() {
+        return of(new DatabasirConfig());
+    }
+
+    public static Databasir of(DatabasirConfig config) {
+        return new Databasir(config);
+    }
+
+}

meta/src/main/java/com/databasir/core/DatabasirConfig.java

@@ -0,0 +1,26 @@
+package com.databasir.core;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Collection;
+import java.util.HashSet;
+
+@Getter
+@Setter
+public class DatabasirConfig {
+
+    private Collection<String> ignoreTableNameRegex = new HashSet<>();
+
+    private Collection<String> ignoreTableColumnNameRegex = new HashSet<>();
+
+    public DatabasirConfig ignoreTable(String tableNameRegex) {
+        ignoreTableNameRegex.add(tableNameRegex);
+        return this;
+    }
+
+    public DatabasirConfig ignoreColumn(String columnNameRegex) {
+        ignoreTableColumnNameRegex.add(columnNameRegex);
+        return this;
+    }
+}

meta/src/main/java/com/databasir/core/diff/Diffs.java

@@ -0,0 +1,17 @@
+package com.databasir.core.diff;
+
+import com.databasir.core.diff.data.RootDiff;
+import com.databasir.core.diff.processor.DatabaseDiffProcessor;
+import com.databasir.core.meta.data.DatabaseMeta;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class Diffs {
+
+    private static final DatabaseDiffProcessor databaseDiffProcessor = new DatabaseDiffProcessor();
+
+    public static RootDiff diff(DatabaseMeta original, DatabaseMeta current) {
+        return databaseDiffProcessor.process(original, current);
+    }
+
+}

meta/src/main/java/com/databasir/core/diff/data/Diff.java

@@ -0,0 +1,11 @@
+package com.databasir.core.diff.data;
+
+public interface Diff {
+
+    DiffType getDiffType();
+
+    Object getOriginal();
+
+    Object getCurrent();
+
+}

meta/src/main/java/com/databasir/core/diff/data/DiffType.java

@@ -0,0 +1,9 @@
+package com.databasir.core.diff.data;
+
+public enum DiffType {
+    NONE, ADDED, REMOVED, MODIFIED;
+
+    public static boolean isModified(DiffType type) {
+        return type != null && type != NONE;
+    }
+}

meta/src/main/java/com/databasir/core/diff/data/FieldDiff.java

@@ -0,0 +1,24 @@
+package com.databasir.core.diff.data;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Data
+@Builder
+public class FieldDiff implements Diff {
+
+    private String fieldName;
+
+    private DiffType diffType;
+
+    private Object original;
+
+    private Object current;
+
+    @Builder.Default
+    private List<FieldDiff> fields = new ArrayList<>();
+
+}

meta/src/main/java/com/databasir/core/diff/data/RootDiff.java

@@ -0,0 +1,15 @@
+package com.databasir.core.diff.data;
+
+import lombok.Data;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Data
+public class RootDiff {
+
+    private DiffType diffType;
+
+    private List<FieldDiff> fields = new ArrayList<>();
+
+}

meta/src/main/java/com/databasir/core/diff/processor/ColumnDiffProcessor.java

@@ -0,0 +1,14 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.FieldDiff;
+import com.databasir.core.meta.data.ColumnMeta;
+
+import java.util.List;
+
+public class ColumnDiffProcessor implements DiffProcessor<ColumnMeta> {
+
+    @Override
+    public FieldDiff process(String fieldName, List<ColumnMeta> original, List<ColumnMeta> current) {
+        return diffTableField(original, current, fieldName, ColumnMeta::getName);
+    }
+}

meta/src/main/java/com/databasir/core/diff/processor/DatabaseDiffProcessor.java

@@ -0,0 +1,81 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.DiffType;
+import com.databasir.core.diff.data.FieldDiff;
+import com.databasir.core.diff.data.RootDiff;
+import com.databasir.core.meta.data.DatabaseMeta;
+import lombok.extern.slf4j.Slf4j;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Objects;
+
+@Slf4j
+public class DatabaseDiffProcessor {
+
+    private final TableDiffProcessor tableDiffProcessor = new TableDiffProcessor();
+
+    private static final DatabaseMeta EMPTY = DatabaseMeta.builder().build();
+
+    public RootDiff process(DatabaseMeta original, DatabaseMeta current) {
+        DiffType diffType = null;
+        if (original == null && current != null) {
+            diffType = DiffType.ADDED;
+        }
+        if (original != null && current == null) {
+            diffType = DiffType.REMOVED;
+        }
+        List<FieldDiff> fields = diffDatabaseFields(
+                Objects.requireNonNullElse(original, EMPTY),
+                Objects.requireNonNullElse(current, EMPTY)
+        );
+        boolean isModified = fields.stream().anyMatch(f -> DiffType.isModified(f.getDiffType()));
+        if (diffType == null) {
+            diffType = isModified ? DiffType.MODIFIED : DiffType.NONE;
+        }
+        RootDiff diff = new RootDiff();
+        diff.setFields(fields);
+        diff.setDiffType(diffType);
+        return diff;
+    }
+
+    private List<FieldDiff> diffDatabaseFields(DatabaseMeta original, DatabaseMeta current) {
+        Class<DatabaseMeta> clazz = DatabaseMeta.class;
+        Field[] fields = clazz.getDeclaredFields();
+        List<FieldDiff> diffs = new ArrayList<>(32);
+        // ignore tables diff
+        Arrays.stream(fields)
+                .filter(field -> !Objects.equals(field.getName(), "tables"))
+                .forEach(field -> {
+                    try {
+                        field.setAccessible(true);
+                        Object originalValue = original == null ? null : field.get(original);
+                        Object currentValue = current == null ? null : field.get(current);
+                        if (!Objects.equals(originalValue, currentValue)) {
+                            DiffType diffType;
+                            if (originalValue == null) {
+                                diffType = DiffType.ADDED;
+                            } else if (currentValue == null) {
+                                diffType = DiffType.REMOVED;
+                            } else {
+                                diffType = DiffType.MODIFIED;
+                            }
+                            diffs.add(FieldDiff.builder()
+                                    .diffType(diffType)
+                                    .fieldName(field.getName())
+                                    .original(originalValue)
+                                    .current(currentValue)
+                                    .build());
+                        }
+                    } catch (IllegalAccessException e) {
+                        log.error("diff field failed", e);
+                    }
+                });
+
+        FieldDiff tablesField = tableDiffProcessor.process("tables", original.getTables(), current.getTables());
+        diffs.add(tablesField);
+        return diffs;
+    }
+}

meta/src/main/java/com/databasir/core/diff/processor/DiffProcessor.java

@@ -0,0 +1,101 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.DiffType;
+import com.databasir.core.diff.data.FieldDiff;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+public interface DiffProcessor<T> {
+
+    Logger log = LoggerFactory.getLogger(DiffProcessor.class);
+
+    FieldDiff process(String fieldName, List<T> original, List<T> current);
+
+    default FieldDiff diffTableField(List<T> original,
+                                     List<T> current,
+                                     String fieldName,
+                                     Function<T, String> identity) {
+        Map<String, T> originalMap = toMap(original, identity);
+        Map<String, T> currentMap = toMap(current, identity);
+        List<FieldDiff> columnFieldDiffs = new ArrayList<>(32);
+        // removed
+        List<FieldDiff> removedFields = originalRemovedField(originalMap, currentMap);
+        columnFieldDiffs.addAll(removedFields);
+        // added
+        List<FieldDiff> addedFields = currentAddedField(originalMap, currentMap);
+        columnFieldDiffs.addAll(addedFields);
+        // modified
+        List<FieldDiff> modifiedFields = modifiedField(originalMap, currentMap);
+        columnFieldDiffs.addAll(modifiedFields);
+        return FieldDiff.builder()
+                .fieldName(fieldName)
+                .diffType(columnFieldDiffs.isEmpty() ? DiffType.NONE : DiffType.MODIFIED)
+                .fields(columnFieldDiffs)
+                .build();
+
+    }
+
+    default Map<String, T> toMap(List<T> content, Function<T, String> idMapping) {
+        return content
+                .stream()
+                .collect(Collectors.toMap(idMapping, Function.identity(), (a, b) -> {
+                    log.warn("Duplicate key, origin = {}, current = {}", a, b);
+                    return a;
+                }));
+    }
+
+    default List<FieldDiff> originalRemovedField(Map<String, T> originalMapById,
+                                                 Map<String, T> currentMapById) {
+        return originalMapById.entrySet()
+                .stream()
+                .filter(entry -> !currentMapById.containsKey(entry.getKey()))
+                .map(entry -> FieldDiff.builder()
+                        .fieldName(entry.getKey())
+                        .original(entry.getValue())
+                        .diffType(DiffType.REMOVED)
+                        .build())
+                .collect(Collectors.toList());
+    }
+
+    default List<FieldDiff> currentAddedField(Map<String, T> originalMapById,
+                                              Map<String, T> currentMapById) {
+        return currentMapById.entrySet()
+                .stream()
+                .filter(entry -> !originalMapById.containsKey(entry.getKey()))
+                .map(entry -> FieldDiff.builder()
+                        .fieldName(entry.getKey())
+                        .current(entry.getValue())
+                        .diffType(DiffType.ADDED)
+                        .build())
+                .collect(Collectors.toList());
+    }
+
+    default List<FieldDiff> modifiedField(Map<String, T> original,
+                                          Map<String, T> current) {
+        List<FieldDiff> diff = new ArrayList<>();
+        original.entrySet()
+                .stream()
+                .filter(entry -> current.containsKey(entry.getKey()))
+                .forEach(entry -> {
+                    T originalValue = entry.getValue();
+                    T currentValue = current.get(entry.getKey());
+                    if (!Objects.equals(originalValue, currentValue)) {
+                        FieldDiff fieldDiff = FieldDiff.builder()
+                                .fieldName(entry.getKey())
+                                .original(originalValue)
+                                .current(currentValue)
+                                .diffType(DiffType.MODIFIED)
+                                .build();
+                        diff.add(fieldDiff);
+                    }
+                });
+        return diff;
+    }
+}

meta/src/main/java/com/databasir/core/diff/processor/ForeignKeyDiffProcessor.java

@@ -0,0 +1,18 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.FieldDiff;
+import com.databasir.core.meta.data.ForeignKeyMeta;
+
+import java.util.List;
+
+public class ForeignKeyDiffProcessor implements DiffProcessor<ForeignKeyMeta> {
+
+    @Override
+    public FieldDiff process(String fieldName, List<ForeignKeyMeta> original, List<ForeignKeyMeta> current) {
+        return diffTableField(
+                original,
+                current,
+                "foreignKeys",
+                fk -> fk.getFkTableName() + "." + fk.getFkColumnName() + "." + fk.getKeySeq());
+    }
+}

meta/src/main/java/com/databasir/core/diff/processor/IndexDiffProcessor.java

@@ -0,0 +1,14 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.FieldDiff;
+import com.databasir.core.meta.data.IndexMeta;
+
+import java.util.List;
+
+public class IndexDiffProcessor implements DiffProcessor<IndexMeta> {
+
+    @Override
+    public FieldDiff process(String fieldName, List<IndexMeta> original, List<IndexMeta> current) {
+        return diffTableField(original, current, fieldName, IndexMeta::getName);
+    }
+}

meta/src/main/java/com/databasir/core/diff/processor/TableDiffProcessor.java

@@ -0,0 +1,158 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.DiffType;
+import com.databasir.core.diff.data.FieldDiff;
+import com.databasir.core.meta.data.TableMeta;
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+@Slf4j
+public class TableDiffProcessor implements DiffProcessor<TableMeta> {
+
+    private final IndexDiffProcessor indexDiffProcessor = new IndexDiffProcessor();
+
+    private final ColumnDiffProcessor columnDiffProcessor = new ColumnDiffProcessor();
+
+    private final TriggerDiffProcessor triggerDiffProcessor = new TriggerDiffProcessor();
+
+    private final ForeignKeyDiffProcessor foreignKeyDiffProcessor = new ForeignKeyDiffProcessor();
+
+    private static final TableMeta EMPTY = new TableMeta();
+
+    @Override
+    public FieldDiff process(String fieldName, List<TableMeta> original, List<TableMeta> current) {
+        // diff tables field
+        Map<String, TableMeta> originalMap = toMap(original, TableMeta::getName);
+        Map<String, TableMeta> currentMap = toMap(current, TableMeta::getName);
+        List<FieldDiff> tables = new ArrayList<>();
+        List<TableMeta> added = added(originalMap, currentMap);
+        List<TableMeta> removed = removed(originalMap, currentMap);
+        // added
+        List<FieldDiff> addedFields = added.stream()
+                .map(table -> diffTableField(EMPTY, table))
+                .collect(Collectors.toList());
+        tables.addAll(addedFields);
+        // removed
+        List<FieldDiff> removedFields = removed.stream()
+                .map(table -> diffTableField(table, EMPTY))
+                .collect(Collectors.toList());
+        tables.addAll(removedFields);
+        // modified
+        List<FieldDiff> modified = originalMap.entrySet()
+                .stream()
+                .filter(entry -> currentMap.containsKey(entry.getKey()))
+                .filter(entry -> !Objects.equals(entry.getValue(), currentMap.get(entry.getKey())))
+                .map(entry -> {
+                    TableMeta originalValue = entry.getValue();
+                    TableMeta currentValue = currentMap.get(entry.getKey());
+                    return diffTableField(originalValue, currentValue);
+                })
+                .collect(Collectors.toList());
+        tables.addAll(modified);
+        DiffType tablesDiffType;
+        if (!modified.isEmpty()) {
+            tablesDiffType = DiffType.MODIFIED;
+        } else if (!addedFields.isEmpty()) {
+            tablesDiffType = DiffType.ADDED;
+        } else if (!removedFields.isEmpty()) {
+            tablesDiffType = DiffType.REMOVED;
+        } else {
+            tablesDiffType = DiffType.NONE;
+        }
+        FieldDiff tablesField = FieldDiff.builder()
+                .diffType(tablesDiffType)
+                .fieldName(fieldName)
+                .fields(tables)
+                .build();
+        return tablesField;
+    }
+
+    private List<TableMeta> added(Map<String, TableMeta> originalMap,
+                                  Map<String, TableMeta> currentMap) {
+        return currentMap.entrySet()
+                .stream()
+                .filter(entry -> !originalMap.containsKey(entry.getKey()))
+                .map(Map.Entry::getValue)
+                .collect(Collectors.toList());
+    }
+
+    private List<TableMeta> removed(Map<String, TableMeta> originalMap,
+                                    Map<String, TableMeta> currentMap) {
+        return originalMap.entrySet()
+                .stream()
+                .filter(entry -> !currentMap.containsKey(entry.getKey()))
+                .map(Map.Entry::getValue)
+                .collect(Collectors.toList());
+    }
+
+    private FieldDiff diffTableField(TableMeta original, TableMeta current) {
+        FieldDiff columns =
+                columnDiffProcessor.process("columns", original.getColumns(), current.getColumns());
+        FieldDiff indexes =
+                indexDiffProcessor.process("indexes", original.getIndexes(), current.getIndexes());
+        FieldDiff triggers =
+                triggerDiffProcessor.process("triggers", original.getTriggers(), current.getTriggers());
+        FieldDiff foreignKeys =
+                foreignKeyDiffProcessor.process("foreignKeys", original.getForeignKeys(), current.getForeignKeys());
+        List<FieldDiff> otherFields = fields(original, current);
+
+        List<FieldDiff> fields = new ArrayList<>();
+        fields.add(columns);
+        fields.add(indexes);
+        fields.add(foreignKeys);
+        fields.add(triggers);
+        fields.addAll(otherFields);
+        DiffType diffType;
+        if (original == EMPTY) {
+            diffType = DiffType.ADDED;
+        } else if (current == EMPTY) {
+            diffType = DiffType.REMOVED;
+        } else {
+            diffType = DiffType.MODIFIED;
+        }
+        return FieldDiff.builder()
+                .diffType(diffType)
+                .fieldName(original == EMPTY ? current.getName() : original.getName())
+                .original(current == EMPTY ? original : null)
+                .current(original == EMPTY ? current : null)
+                .fields(fields)
+                .build();
+    }
+
+    private List<FieldDiff> fields(TableMeta original, TableMeta current) {
+        List<FieldDiff> fields = new ArrayList<>();
+        // ignore tables diff
+        Class<TableMeta> clazz = TableMeta.class;
+        List<String> ignoredFields = List.of("columns", "indexes", "triggers", "foreignKeys");
+        Arrays.stream(clazz.getDeclaredFields())
+                .filter(field -> !ignoredFields.contains(field.getName()))
+                .forEach(field -> {
+                    try {
+                        field.setAccessible(true);
+                        Object originalValue = original == null ? null : field.get(original);
+                        Object currentValue = current == null ? null : field.get(current);
+                        if (!Objects.equals(originalValue, currentValue)) {
+                            DiffType diffType;
+                            if (originalValue == null) {
+                                diffType = DiffType.ADDED;
+                            } else if (currentValue == null) {
+                                diffType = DiffType.REMOVED;
+                            } else {
+                                diffType = DiffType.MODIFIED;
+                            }
+                            fields.add(FieldDiff.builder()
+                                    .diffType(diffType)
+                                    .fieldName(field.getName())
+                                    .original(originalValue)
+                                    .current(currentValue)
+                                    .build());
+                        }
+                    } catch (IllegalAccessException e) {
+                        log.error("diff field failed", e);
+                    }
+                });
+        return fields;
+    }
+}

meta/src/main/java/com/databasir/core/diff/processor/TriggerDiffProcessor.java

@@ -0,0 +1,14 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.FieldDiff;
+import com.databasir.core.meta.data.TriggerMeta;
+
+import java.util.List;
+
+public class TriggerDiffProcessor implements DiffProcessor<TriggerMeta> {
+
+    @Override
+    public FieldDiff process(String fieldName, List<TriggerMeta> original, List<TriggerMeta> current) {
+        return diffTableField(original, current, fieldName, TriggerMeta::getName);
+    }
+}

meta/src/main/java/com/databasir/core/meta/data/ColumnMeta.java

@@ -0,0 +1,36 @@
+package com.databasir.core.meta.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ColumnMeta {
+
+    private String name;
+
+    private String comment;
+
+    private String type;
+
+    private Integer dataType;
+
+    /**
+     * if default value is empty string, will be converted to ''.
+     */
+    private String defaultValue;
+
+    private Integer size;
+
+    private Integer decimalDigits;
+
+    private String nullable;
+
+    private String autoIncrement;
+
+    private Boolean isPrimaryKey;
+}

meta/src/main/java/com/databasir/core/meta/data/DatabaseMeta.java

@@ -0,0 +1,50 @@
+package com.databasir.core.meta.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.Collections;
+import java.util.List;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class DatabaseMeta {
+
+    /**
+     * product_name
+     */
+    private String productName;
+
+    /**
+     * product_version
+     */
+    private String productVersion;
+
+    /**
+     * driver_name
+     */
+    private String driverName;
+
+    /**
+     * driver_version
+     */
+    private String driverVersion;
+
+    /**
+     * database_name
+     */
+    private String databaseName;
+
+    /**
+     * schema_name
+     */
+    private String schemaName;
+
+    @Builder.Default
+    private List<TableMeta> tables = Collections.emptyList();
+
+}

meta/src/main/java/com/databasir/core/meta/data/ForeignKeyMeta.java

@@ -0,0 +1,43 @@
+package com.databasir.core.meta.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class ForeignKeyMeta {
+
+    private Integer keySeq;
+
+    /**
+     * may null
+     */
+    private String pkName;
+
+    private String pkTableName;
+
+    private String pkColumnName;
+
+    /**
+     * may null
+     */
+    private String fkName;
+
+    private String fkTableName;
+
+    private String fkColumnName;
+
+    /**
+     * NO_ACTION \ CASCADE \ SET_NULL \ SET_DEFAULT
+     */
+    private String updateRule;
+
+    /**
+     * NO_ACTION \ CASCADE \ SET_NULL \ SET_DEFAULT
+     */
+    private String deleteRule;
+}

meta/src/main/java/com/databasir/core/meta/data/IndexMeta.java

@@ -0,0 +1,23 @@
+package com.databasir.core.meta.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.Collections;
+import java.util.List;
+
+@Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class IndexMeta {
+
+    private String name;
+
+    @Builder.Default
+    private List<String> columnNames = Collections.emptyList();
+
+    private Boolean isUniqueKey;
+}

meta/src/main/java/com/databasir/core/meta/data/TableMeta.java

@@ -0,0 +1,34 @@
+package com.databasir.core.meta.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.Collections;
+import java.util.List;
+
+@Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class TableMeta {
+
+    private String name;
+
+    private String type;
+
+    private String comment;
+
+    @Builder.Default
+    private List<ColumnMeta> columns = Collections.emptyList();
+
+    @Builder.Default
+    private List<TriggerMeta> triggers = Collections.emptyList();
+
+    @Builder.Default
+    private List<IndexMeta> indexes = Collections.emptyList();
+
+    @Builder.Default
+    private List<ForeignKeyMeta> foreignKeys = Collections.emptyList();
+}

meta/src/main/java/com/databasir/core/meta/data/TriggerMeta.java

@@ -0,0 +1,32 @@
+package com.databasir.core.meta.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * now: only support mysql, postgresql.
+ */
+@Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class TriggerMeta {
+
+    private String name;
+
+    /**
+     * example: BEFORE, AFTER
+     */
+    private String timing;
+
+    /**
+     * example: INSERT, UPDATE
+     */
+    private String manipulation;
+
+    private String statement;
+
+    private String createAt;
+}

meta/src/main/java/com/databasir/core/meta/provider/ColumnMetaProvider.java

@@ -0,0 +1,13 @@
+package com.databasir.core.meta.provider;
+
+import com.databasir.core.meta.data.ColumnMeta;
+import com.databasir.core.meta.provider.condition.TableCondition;
+
+import java.sql.Connection;
+import java.util.List;
+
+public interface ColumnMetaProvider {
+
+    List<ColumnMeta> selectColumns(Connection connection, TableCondition condition);
+
+}

meta/src/main/java/com/databasir/core/meta/provider/DatabaseMetaProvider.java

@@ -0,0 +1,13 @@
+package com.databasir.core.meta.provider;
+
+import com.databasir.core.meta.data.DatabaseMeta;
+import com.databasir.core.meta.provider.condition.Condition;
+
+import java.sql.Connection;
+import java.util.Optional;
+
+public interface DatabaseMetaProvider {
+
+    Optional<DatabaseMeta> select(Connection connection, Condition condition);
+
+}

meta/src/main/java/com/databasir/core/meta/provider/ForeignKeyMetaProvider.java

@@ -0,0 +1,13 @@
+package com.databasir.core.meta.provider;
+
+import com.databasir.core.meta.data.ForeignKeyMeta;
+import com.databasir.core.meta.provider.condition.TableCondition;
+
+import java.sql.Connection;
+import java.util.List;
+
+public interface ForeignKeyMetaProvider {
+
+    List<ForeignKeyMeta> selectForeignKeys(Connection connection, TableCondition condition);
+
+}

meta/src/main/java/com/databasir/core/meta/provider/IndexMetaProvider.java

@@ -0,0 +1,12 @@
+package com.databasir.core.meta.provider;
+
+import com.databasir.core.meta.data.IndexMeta;
+import com.databasir.core.meta.provider.condition.TableCondition;
+
+import java.sql.Connection;
+import java.util.List;
+
+public interface IndexMetaProvider {
+
+    List<IndexMeta> selectIndexes(Connection connection, TableCondition condition);
+}

meta/src/main/java/com/databasir/core/meta/provider/MetaProviders.java

@@ -0,0 +1,60 @@
+package com.databasir.core.meta.provider;
+
+import com.databasir.core.meta.provider.jdbc.*;
+import com.databasir.core.meta.provider.mysql.MysqlTableTriggerMetaProvider;
+import lombok.extern.slf4j.Slf4j;
+
+import java.sql.Connection;
+import java.sql.DatabaseMetaData;
+import java.sql.SQLException;
+
+@Slf4j
+public class MetaProviders {
+
+    public static DatabaseMetaProvider jdbc() {
+        var columnMetaProvider = new JdbcColumnMetaProvider();
+        var foreignKeyMetaProvider = new JdbcForeignKeyMetaProvider();
+        var indexMetaProvider = new JdbcIndexMetaProvider();
+        var triggerMetaProvider = new JdbcTriggerMetaProvider();
+        var tableMetaProvider = new JdbcTableMetaProvider(
+                columnMetaProvider,
+                indexMetaProvider,
+                triggerMetaProvider,
+                foreignKeyMetaProvider
+        );
+        return new JdbcDatabaseMetaProvider(tableMetaProvider);
+    }
+
+    public static DatabaseMetaProvider of(Connection connection) {
+        String url;
+        try {
+            DatabaseMetaData metaData = connection.getMetaData();
+            url = metaData.getURL();
+        } catch (SQLException e) {
+            log.warn("failed to get connect url, {}, fallback to jdbc provider", e.getMessage());
+            return jdbc();
+        }
+        if (url.contains(":sqlserver:")) {
+            return jdbc();
+        }
+        if (url.contains(":mysql:")) {
+            return mysql();
+        }
+        return jdbc();
+    }
+
+    private static DatabaseMetaProvider mysql() {
+        var columnMetaProvider = new JdbcColumnMetaProvider();
+        var foreignKeyMetaProvider = new JdbcForeignKeyMetaProvider();
+        var indexMetaProvider = new JdbcIndexMetaProvider();
+        var triggerMetaProvider = new MysqlTableTriggerMetaProvider();
+        var tableMetaProvider = new JdbcTableMetaProvider(
+                columnMetaProvider,
+                indexMetaProvider,
+                triggerMetaProvider,
+                foreignKeyMetaProvider
+        );
+        return new JdbcDatabaseMetaProvider(tableMetaProvider);
+    }
+
+}

meta/src/main/java/com/databasir/core/meta/provider/SqlProvider.java

@@ -0,0 +1,75 @@
+package com.databasir.core.meta.provider;
+
+import java.util.Optional;
+
+/**
+ * TODO use to extension repository
+ */
+public interface SqlProvider {
+
+    Default DEFAULT = new Default();
+
+    /**
+     * <p>
+     * generate sql to select database information, should return the follow columns
+     * </p>
+     *
+     * <table>
+     *     <tr>
+     *         <th> column name </th>
+     *         <th> column type </th>
+     *         <th> description </th>
+     *         <th> nullable </th>
+     *     </tr>
+     *     <tr>
+     *         <td> TABLE_CAT </td>
+     *         <td> String </td>
+     *         <td> catalog name </td>
+     *         <td> NO </td>
+     *     </tr>
+     * </table>
+     * <br>
+     *
+     */
+    default Optional<String> databaseMetaSql(String databaseName) {
+        return Optional.empty();
+    }
+
+    /**
+     * generate sql to select table information, should return the follow columns
+     * <table>
+     *     <tr>
+     *         <th> column name </th>
+     *         <th> column type </th>
+     *         <th> description </th>
+     *         <th> nullable </th>
+     *     </tr>
+     *     <tr>
+     *         <td> TABLE_CAT </td>
+     *         <td> String </td>
+     *         <td> catalog name </td>
+     *         <td> NO </td>
+     *     </tr>
+     * </table>
+     *
+     */
+    default Optional<String> tableMetaSql(String databaseName, String tableName) {
+        return Optional.empty();
+    }
+
+    default Optional<String> tableColumnMetaSql(String databaseName, String tableName) {
+        return Optional.empty();
+    }
+
+    default Optional<String> tableIndexMetaSql(String databaseName, String tableName) {
+        return Optional.empty();
+    }
+
+    default Optional<String> tableTriggerMetaSql(String databaseName, String tableName) {
+        return Optional.empty();
+    }
+
+    class Default implements SqlProvider {
+
+    }
+}

meta/src/main/java/com/databasir/core/meta/provider/TableMetaProvider.java

@@ -0,0 +1,13 @@
+package com.databasir.core.meta.provider;
+
+import com.databasir.core.meta.data.TableMeta;
+import com.databasir.core.meta.provider.condition.Condition;
+
+import java.sql.Connection;
+import java.util.List;
+
+public interface TableMetaProvider {
+
+    List<TableMeta> selectTables(Connection connection, Condition condition);
+
+}

meta/src/main/java/com/databasir/core/meta/provider/TriggerMetaProvider.java

@@ -0,0 +1,13 @@
+package com.databasir.core.meta.provider;
+
+import com.databasir.core.meta.data.TriggerMeta;
+import com.databasir.core.meta.provider.condition.TableCondition;
+
+import java.sql.Connection;
+import java.util.List;
+
+public interface TriggerMetaProvider {
+
+    List<TriggerMeta> selectTriggers(Connection connection, TableCondition condition);
+
+}

meta/src/main/java/com/databasir/core/meta/provider/condition/Condition.java

@@ -0,0 +1,34 @@
+package com.databasir.core.meta.provider.condition;
+
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.experimental.SuperBuilder;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.regex.Pattern;
+
+@SuperBuilder
+@Getter
+public class Condition {
+
+    @NonNull
+    private String databaseName;
+
+    private String schemaName;
+
+    @Builder.Default
+    private Collection<String> ignoreTableNameRegex = Collections.emptyList();
+
+    @Builder.Default
+    private Collection<String> ignoreTableColumnNameRegex = Collections.emptyList();
+
+    public boolean tableIsIgnored(String tableName) {
+        return ignoreTableNameRegex.stream().anyMatch(regex -> Pattern.matches(regex, tableName));
+    }
+
+    public boolean columnIsIgnored(String column) {
+        return ignoreTableColumnNameRegex.stream().anyMatch(regex -> Pattern.matches(regex, column));
+    }
+}

meta/src/main/java/com/databasir/core/meta/provider/condition/TableCondition.java

@@ -0,0 +1,24 @@
+package com.databasir.core.meta.provider.condition;
+
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.experimental.SuperBuilder;
+
+@SuperBuilder
+@Getter
+public class TableCondition extends Condition {
+
+    @NonNull
+    private String tableName;
+
+    public static TableCondition of(Condition condition, String tableName) {
+        return TableCondition.builder()
+                .databaseName(condition.getDatabaseName())
+                .tableName(tableName)
+                .schemaName(condition.getSchemaName())
+                .ignoreTableNameRegex(condition.getIgnoreTableNameRegex())
+                .ignoreTableColumnNameRegex(condition.getIgnoreTableColumnNameRegex())
+                .build();
+    }
+
+}

meta/src/main/java/com/databasir/core/meta/provider/jdbc/JdbcColumnMetaProvider.java

@@ -0,0 +1,129 @@
+package com.databasir.core.meta.provider.jdbc;
+
+import com.databasir.core.meta.data.ColumnMeta;
+import com.databasir.core.meta.provider.ColumnMetaProvider;
+import com.databasir.core.meta.provider.condition.TableCondition;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import java.sql.Connection;
+import java.sql.DatabaseMetaData;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+@Slf4j
+@RequiredArgsConstructor
+public class JdbcColumnMetaProvider implements ColumnMetaProvider {
+
+    @Override
+    public List<ColumnMeta> selectColumns(Connection connection, TableCondition tableCondition) {
+        try {
+            return doSelect(connection, tableCondition);
+        } catch (SQLException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    private List<ColumnMeta> doSelect(Connection connection, TableCondition tableCondition) throws SQLException {
+        List<ColumnMeta> columnDocs = new ArrayList<>();
+        String databaseName = tableCondition.getDatabaseName();
+        String tableName = tableCondition.getTableName();
+        List<String> primaryKeyColumns = selectPrimaryKeyColumns(connection.getMetaData(), tableCondition);
+        ResultSet columnsResult;
+        try {
+            columnsResult = connection.getMetaData()
+                    .getColumns(databaseName, tableCondition.getSchemaName(), tableName, null);
+        } catch (SQLException e) {
+            log.warn("warn: ignore columns in " + databaseName + "." + tableName + ", error: " + e.getMessage());
+            return columnDocs;
+        }
+        try {
+            while (columnsResult.next()) {
+                String columnName = columnsResult.getString("COLUMN_NAME");
+                if (tableCondition.columnIsIgnored(columnName)) {
+                    if (log.isWarnEnabled()) {
+                        log.warn("ignore column: " + columnName);
+                    }
+                } else {
+                    String defaultValue = columnsResult.getString("COLUMN_DEF");
+                    String isNullable = columnsResult.getString("IS_NULLABLE");
+                    if (isNullable.trim().equals("")) {
+                        isNullable = "UNKNOWN";
+                    }
+
+                    if (defaultValue != null && defaultValue.trim().equals("")) {
+                        defaultValue = "'" + defaultValue + "'";
+                    }
+                    Integer decimalDigits;
+                    if (columnsResult.getObject("DECIMAL_DIGITS") == null) {
+                        decimalDigits = null;
+                    } else {
+                        decimalDigits = columnsResult.getInt("DECIMAL_DIGITS");
+                    }
+                    Integer columnSize = columnsResult.getInt("COLUMN_SIZE");
+                    String columnType = columnsResult.getString("TYPE_NAME");
+                    String columnComment = columnsResult.getString("REMARKS");
+                    int dataType = columnsResult.getInt("DATA_TYPE");
+                    String autoIncrement = retrieveAutoIncrement(columnsResult);
+                    ColumnMeta columnMeta = ColumnMeta.builder()
+                            .name(columnName)
+                            .dataType(dataType)
+                            .type(columnType)
+                            .size(columnSize)
+                            .decimalDigits(decimalDigits)
+                            .nullable(isNullable)
+                            .autoIncrement(autoIncrement)
+                            .comment(columnComment)
+                            .defaultValue(defaultValue)
+                            .isPrimaryKey(primaryKeyColumns.contains(columnName))
+                            .build();
+                    columnDocs.add(columnMeta);
+                }
+            }
+        } finally {
+            columnsResult.close();
+        }
+        return columnDocs;
+    }
+
+    private String retrieveAutoIncrement(ResultSet columnsResult) {
+        try {
+            return retrieveAutoIncrement(columnsResult, "IS_AUTOINCREMENT");
+        } catch (SQLException e) {
+            log.warn("get is_autoincrement failed, fallback to is_auto_increment, error: " + e.getMessage());
+            try {
+                // hive jdbc driver doesn't support is_autoincrement, fallback to is_auto_increment
+                return retrieveAutoIncrement(columnsResult, "is_auto_increment");
+            } catch (SQLException ex) {
+                log.warn("get is_auto_increment failed, error: " + ex.getMessage());
+                return "UNKNOWN";
+            }
+        }
+    }
+
+    private String retrieveAutoIncrement(ResultSet columnsResult, String columnName) throws SQLException {
+        String isAutoIncrement = columnsResult.getString(columnName);
+        if (isAutoIncrement.trim().equals("")) {
+            return "UNKNOWN";
+        }
+        return isAutoIncrement;
+    }
+
+    private List<String> selectPrimaryKeyColumns(DatabaseMetaData meta,
+                                                 TableCondition tableCondition) throws SQLException {
+        ResultSet result = meta.getPrimaryKeys(tableCondition.getDatabaseName(),
+                tableCondition.getSchemaName(), tableCondition.getTableName());
+        try {
+            List<String> columns = new ArrayList<>();
+            while (result.next()) {
+                String columnName = result.getString("COLUMN_NAME");
+                columns.add(columnName);
+            }
+            return columns;
+        } finally {
+            result.close();
+        }
+    }
+}

meta/src/main/java/com/databasir/core/meta/provider/jdbc/JdbcDatabaseMetaProvider.java

@@ -0,0 +1,64 @@
+package com.databasir.core.meta.provider.jdbc;
+
+import com.databasir.core.meta.data.DatabaseMeta;
+import com.databasir.core.meta.data.TableMeta;
+import com.databasir.core.meta.provider.DatabaseMetaProvider;
+import com.databasir.core.meta.provider.TableMetaProvider;
+import com.databasir.core.meta.provider.condition.Condition;
+import lombok.RequiredArgsConstructor;
+
+import java.sql.Connection;
+import java.sql.DatabaseMetaData;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+@RequiredArgsConstructor
+public class JdbcDatabaseMetaProvider implements DatabaseMetaProvider {
+
+    private final TableMetaProvider tableMetaProvider;
+
+    @Override
+    public Optional<DatabaseMeta> select(Connection connection, Condition condition) {
+        try {
+            DatabaseMetaData metaData = connection.getMetaData();
+            ResultSet catalogs = metaData.getCatalogs();
+            while (catalogs.next()) {
+                String catalogName = catalogs.getString("TABLE_CAT");
+                if (Objects.equals(condition.getDatabaseName(), catalogName)) {
+                    List<TableMeta> tableDocs = tableMetaProvider.selectTables(connection, condition);
+                    DatabaseMeta meta = DatabaseMeta.builder()
+                            .productName(metaData.getDatabaseProductName())
+                            .productVersion(metaData.getDatabaseProductVersion())
+                            .databaseName(catalogName)
+                            .schemaName(condition.getSchemaName())
+                            .tables(tableDocs)
+                            .build();
+                    return Optional.of(meta);
+                }
+            }
+
+            ResultSet schemas = metaData.getSchemas();
+            while (schemas.next()) {
+                String schemaName = schemas.getString("TABLE_SCHEM");
+                if (Objects.equals(condition.getSchemaName(), schemaName)) {
+                    List<TableMeta> tableDocs = tableMetaProvider.selectTables(connection, condition);
+                    DatabaseMeta meta = DatabaseMeta.builder()
+                            .productName(metaData.getDatabaseProductName())
+                            .productVersion(metaData.getDatabaseProductVersion())
+                            .databaseName(condition.getDatabaseName())
+                            .schemaName(condition.getSchemaName())
+                            .tables(tableDocs)
+                            .build();
+                    return Optional.of(meta);
+                }
+            }
+            return Optional.empty();
+        } catch (SQLException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+}

meta/src/main/java/com/databasir/core/meta/provider/jdbc/JdbcForeignKeyMetaProvider.java

@@ -0,0 +1,92 @@
+package com.databasir.core.meta.provider.jdbc;
+
+import com.databasir.core.meta.data.ForeignKeyMeta;
+import com.databasir.core.meta.provider.ForeignKeyMetaProvider;
+import com.databasir.core.meta.provider.condition.TableCondition;
+import lombok.extern.slf4j.Slf4j;
+
+import java.sql.Connection;
+import java.sql.DatabaseMetaData;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+@Slf4j
+public class JdbcForeignKeyMetaProvider implements ForeignKeyMetaProvider {
+
+    @Override
+    public List<ForeignKeyMeta> selectForeignKeys(Connection connection, TableCondition condition) {
+        String databaseName = condition.getDatabaseName();
+        String schemaName = condition.getSchemaName();
+        String tableName = condition.getTableName();
+        List<ForeignKeyMeta> foreignKeys = new ArrayList<>();
+        ResultSet keyResult = null;
+        try {
+            keyResult = connection.getMetaData().getImportedKeys(databaseName, schemaName, tableName);
+            while (keyResult.next()) {
+                String fkTableName = keyResult.getString("FKTABLE_NAME");
+                String fkColumnName = keyResult.getString("FKCOLUMN_NAME");
+                String fkName = keyResult.getString("FK_NAME");
+
+                String pkTableName = keyResult.getString("PKTABLE_NAME");
+                String pkColumnName = keyResult.getString("PKCOLUMN_NAME");
+                String pkName = keyResult.getString("PK_NAME");
+                int updateRule = keyResult.getInt("UPDATE_RULE");
+                int keySeq = keyResult.getInt("KEY_SEQ");
+                int deleteRule = keyResult.getInt("DELETE_RULE");
+                ForeignKeyMeta meta = ForeignKeyMeta.builder()
+                        .keySeq(keySeq)
+                        .fkTableName(fkTableName)
+                        .fkColumnName(fkColumnName)
+                        .fkName(fkName)
+                        .pkTableName(pkTableName)
+                        .pkColumnName(pkColumnName)
+                        .pkName(pkName)
+                        .updateRule(updateRuleConvert(updateRule))
+                        .deleteRule(deleteRuleConvert(deleteRule))
+                        .build();
+                foreignKeys.add(meta);
+            }
+        } catch (SQLException e) {
+            log.warn("warn: ignore foreign keys in " + databaseName + "." + tableName + ", " + e.getMessage());
+        } finally {
+            try {
+                if (keyResult != null) {
+                    keyResult.close();
+                }
+            } catch (SQLException e) {
+                log.warn("warn: close key result error " + databaseName + "." + tableName + ", " + e.getMessage());
+            }
+        }
+        return foreignKeys;
+    }
+
+    private String updateRuleConvert(int updateRule) {
+        return doMapping(updateRule, "update");
+    }
+
+    private String deleteRuleConvert(int deleteRule) {
+        return doMapping(deleteRule, "delete");
+    }
+
+    private String doMapping(int rule, String type) {
+        if (rule == DatabaseMetaData.importedKeyCascade) {
+            return "CASCADE";
+        }
+        if (rule == DatabaseMetaData.importedKeyRestrict) {
+            return "CASCADE";
+        }
+        if (rule == DatabaseMetaData.importedKeyNoAction) {
+            return "RESTRICT";
+        }
+        if (rule == DatabaseMetaData.importedKeySetNull) {
+            return "SET_NULL";
+        }
+        if (rule == DatabaseMetaData.importedKeySetDefault) {
+            return "SET_DEFAULT";
+        }
+        log.warn("can not map foreign key " + type + " rule = " + rule);
+        return "";
+    }
+}

meta/src/main/java/com/databasir/core/meta/provider/jdbc/JdbcIndexMetaProvider.java

@@ -0,0 +1,63 @@
+package com.databasir.core.meta.provider.jdbc;
+
+import com.databasir.core.meta.data.IndexMeta;
+import com.databasir.core.meta.provider.IndexMetaProvider;
+import com.databasir.core.meta.provider.condition.TableCondition;
+import lombok.extern.slf4j.Slf4j;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.*;
+
+@Slf4j
+public class JdbcIndexMetaProvider implements IndexMetaProvider {
+    @Override
+    public List<IndexMeta> selectIndexes(Connection connection, TableCondition condition) {
+        try {
+            return doCreateIndexDocs(connection, condition);
+        } catch (SQLException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    private List<IndexMeta> doCreateIndexDocs(Connection connection, TableCondition condition)
+            throws SQLException {
+        String databaseName = condition.getDatabaseName();
+        String tableName = condition.getTableName();
+        List<IndexMeta> indexMetas = new ArrayList<>();
+        ResultSet indexResults;
+        try {
+            indexResults = connection.getMetaData()
+                    .getIndexInfo(databaseName, condition.getSchemaName(), tableName, false, false);
+        } catch (SQLException e) {
+            log.warn("warn: ignore " + databaseName + "." + tableName + ", error=" + e.getMessage());
+            return indexMetas;
+        }
+
+        Map<String, IndexMeta> pojoGroupByName = new HashMap<>();
+        try {
+            while (indexResults.next()) {
+                Boolean nonUnique = indexResults.getBoolean("NON_UNIQUE");
+                String indexName = indexResults.getString("INDEX_NAME");
+                String columnName = indexResults.getString("COLUMN_NAME");
+                if (pojoGroupByName.containsKey(indexName)) {
+                    pojoGroupByName.get(indexName).getColumnNames().add(columnName);
+                } else {
+                    List<String> columns = new ArrayList<>();
+                    columns.add(columnName);
+                    IndexMeta indexMeta = IndexMeta.builder()
+                            .name(indexName)
+                            .columnNames(columns)
+                            .isUniqueKey(Objects.equals(nonUnique, false))
+                            .build();
+                    pojoGroupByName.put(indexName, indexMeta);
+                }
+            }
+        } finally {
+            indexResults.close();
+        }
+        return new ArrayList<>(pojoGroupByName.values());
+    }
+
+}

meta/src/main/java/com/databasir/core/meta/provider/jdbc/JdbcTableMetaProvider.java

@@ -0,0 +1,80 @@
+package com.databasir.core.meta.provider.jdbc;
+
+import com.databasir.core.meta.data.ColumnMeta;
+import com.databasir.core.meta.data.TableMeta;
+import com.databasir.core.meta.provider.*;
+import com.databasir.core.meta.provider.condition.Condition;
+import com.databasir.core.meta.provider.condition.TableCondition;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+@RequiredArgsConstructor
+@Slf4j
+public class JdbcTableMetaProvider implements TableMetaProvider {
+
+    private final ColumnMetaProvider columnMetaProvider;
+
+    private final IndexMetaProvider indexMetaProvider;
+
+    private final TriggerMetaProvider triggerMetaProvider;
+
+    private final ForeignKeyMetaProvider foreignKeyMetaProvider;
+
+    @Override
+    public List<TableMeta> selectTables(Connection connection, Condition condition) {
+        try {
+            return doSelect(connection, condition);
+        } catch (SQLException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+
+    private List<TableMeta> doSelect(Connection connection, Condition condition) throws SQLException {
+        List<TableMeta> tableMetas = new ArrayList<>();
+        String databaseName = condition.getDatabaseName();
+        ResultSet tablesResult = connection.getMetaData()
+                .getTables(databaseName, condition.getSchemaName(), null, new String[]{"TABLE"});
+        try {
+            while (tablesResult.next()) {
+                String tableName = tablesResult.getString("TABLE_NAME");
+                if (condition.tableIsIgnored(tableName)) {
+                    if (log.isWarnEnabled()) {
+                        log.warn("ignored table: " + databaseName + "." + tableName);
+                    }
+                } else {
+                    String tableType = tablesResult.getString("TABLE_TYPE");
+                    String tableComment = tablesResult.getString("REMARKS");
+                    TableCondition tableCondition = TableCondition.of(condition, tableName);
+                    List<ColumnMeta> columns = columnMetaProvider.selectColumns(connection, tableCondition);
+                    if (columns.isEmpty()) {
+                        if (log.isWarnEnabled()) {
+                            log.warn("ignored table: " + databaseName + "." + tableName
+                                    + ", caused by get empty columns");
+                        }
+                        continue;
+                    }
+                    TableMeta tableMeta = TableMeta.builder()
+                            .name(tableName)
+                            .type(tableType)
+                            .comment(tableComment)
+                            .columns(columns)
+                            .foreignKeys(foreignKeyMetaProvider.selectForeignKeys(connection, tableCondition))
+                            .indexes(indexMetaProvider.selectIndexes(connection, tableCondition))
+                            .triggers(triggerMetaProvider.selectTriggers(connection, tableCondition))
+                            .build();
+                    tableMetas.add(tableMeta);
+                }
+            }
+        } finally {
+            tablesResult.close();
+        }
+        return tableMetas;
+    }
+
+}

meta/src/main/java/com/databasir/core/meta/provider/jdbc/JdbcTriggerMetaProvider.java

@@ -0,0 +1,18 @@
+package com.databasir.core.meta.provider.jdbc;
+
+import com.databasir.core.meta.data.TriggerMeta;
+import com.databasir.core.meta.provider.TriggerMetaProvider;
+import com.databasir.core.meta.provider.condition.TableCondition;
+
+import java.sql.Connection;
+import java.util.Collections;
+import java.util.List;
+
+public class JdbcTriggerMetaProvider implements TriggerMetaProvider {
+
+    @Override
+    public List<TriggerMeta> selectTriggers(Connection connection, TableCondition condition) {
+        // note: jdbc not support get triggers
+        return Collections.emptyList();
+    }
+}

meta/src/main/java/com/databasir/core/meta/provider/mysql/MysqlTableTriggerMetaProvider.java

@@ -0,0 +1,69 @@
+package com.databasir.core.meta.provider.mysql;
+
+import com.databasir.core.meta.data.TriggerMeta;
+import com.databasir.core.meta.provider.TriggerMetaProvider;
+import com.databasir.core.meta.provider.condition.TableCondition;
+import lombok.extern.slf4j.Slf4j;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+@Slf4j
+public class MysqlTableTriggerMetaProvider implements TriggerMetaProvider {
+
+    @Override
+    public List<TriggerMeta> selectTriggers(Connection connection, TableCondition condition) {
+        String sql = "SELECT TRIGGER_CATALOG,\n"
+                + "       TRIGGER_SCHEMA,\n"
+                + "       TRIGGER_NAME,\n"
+                + "       EVENT_MANIPULATION,\n"
+                + "       EVENT_OBJECT_CATALOG,\n"
+                + "       EVENT_OBJECT_SCHEMA,\n"
+                + "       EVENT_OBJECT_TABLE,\n"
+                + "       ACTION_ORDER,\n"
+                + "       ACTION_CONDITION,\n"
+                + "       ACTION_STATEMENT,\n"
+                + "       ACTION_ORIENTATION,\n"
+                + "       ACTION_TIMING,\n"
+                + "       ACTION_REFERENCE_OLD_TABLE,\n"
+                + "       ACTION_REFERENCE_NEW_TABLE,\n"
+                + "       ACTION_REFERENCE_OLD_ROW,\n"
+                + "       ACTION_REFERENCE_NEW_ROW,\n"
+                + "       CREATED,\n"
+                + "       SQL_MODE,\n"
+                + "       DEFINER\n "
+                + "FROM information_schema.TRIGGERS WHERE EVENT_OBJECT_SCHEMA = ? AND EVENT_OBJECT_TABLE = ?";
+        try {
+            PreparedStatement preparedStatement = connection.prepareStatement(sql);
+            preparedStatement.setObject(1, condition.getDatabaseName());
+            preparedStatement.setObject(2, condition.getTableName());
+            ResultSet results = preparedStatement.executeQuery();
+            List<TriggerMeta> triggers = new ArrayList<>();
+            while (results.next()) {
+                String name = results.getString("TRIGGER_NAME");
+                String statement = results.getString("ACTION_STATEMENT");
+                String timing = results.getString("ACTION_TIMING");
+                String manipulation = results.getString("EVENT_MANIPULATION");
+                String created = results.getString("CREATED");
+                TriggerMeta meta = TriggerMeta.builder()
+                        .name(name)
+                        .manipulation(manipulation)
+                        .timing(timing)
+                        .statement(statement)
+                        .createAt(created)
+                        .build();
+                triggers.add(meta);
+            }
+            return triggers;
+        } catch (SQLException e) {
+            log.warn("create trigger doc failed", e);
+            return Collections.emptyList();
+        }
+    }
+
+}

meta/src/main/java/com/databasir/core/render/Render.java

@@ -0,0 +1,17 @@
+package com.databasir.core.render;
+
+import com.databasir.core.meta.data.DatabaseMeta;
+import com.databasir.core.render.markdown.MarkdownTemplateRender;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public interface Render {
+
+    void rendering(DatabaseMeta meta, OutputStream outputStream) throws IOException;
+
+    static Render markdownRender(RenderConfig configuration) {
+        return new MarkdownTemplateRender(configuration);
+    }
+
+}

meta/src/main/java/com/databasir/core/render/RenderConfig.java

@@ -0,0 +1,65 @@
+package com.databasir.core.render;
+
+import com.databasir.core.meta.data.ColumnMeta;
+import com.databasir.core.meta.data.IndexMeta;
+import com.databasir.core.meta.data.TriggerMeta;
+import lombok.Data;
+
+import java.util.LinkedHashMap;
+import java.util.function.Function;
+
+@Data
+public class RenderConfig {
+
+    private Boolean renderTables = true;
+
+    private Boolean renderColumns = true;
+
+    private Boolean renderIndexes = true;
+
+    private Boolean renderTriggers = true;
+
+    private LinkedHashMap<String, Function<ColumnMeta, String>> columnTitleAndValueMapping =
+            columnTitleAndValueMapping();
+
+    private LinkedHashMap<String, Function<IndexMeta, String>> indexTitleAndValueMapping =
+            indexTitleAndValueMapping();
+
+    private LinkedHashMap<String, Function<TriggerMeta, String>> triggerTitleAndValueMapping =
+            triggerTitleAndValueMapping();
+
+    protected LinkedHashMap<String, Function<ColumnMeta, String>> columnTitleAndValueMapping() {
+        LinkedHashMap<String, Function<ColumnMeta, String>> mapping = new LinkedHashMap<>();
+        mapping.put("Name", ColumnMeta::getName);
+        mapping.put("Type", column -> {
+            String type;
+            if (column.getDecimalDigits() == null || column.getDecimalDigits().equals(0)) {
+                type = column.getType()
+                        + "(" + column.getSize().toString() + ")";
+            } else {
+                type = column.getType()
+                        + "(" + column.getSize().toString() + ", " + column.getDecimalDigits().toString() + ")";
+            }
+            return type;
+        });
+        return mapping;
+    }
+
+    protected LinkedHashMap<String, Function<IndexMeta, String>> indexTitleAndValueMapping() {
+        LinkedHashMap<String, Function<IndexMeta, String>> mapping = new LinkedHashMap<>();
+        mapping.put("Name", IndexMeta::getName);
+        mapping.put("IsUnique", index -> index.getIsUniqueKey() ? "YES" : "");
+        mapping.put("Columns", index -> String.join(", ", index.getColumnNames()));
+        return mapping;
+    }
+
+    protected LinkedHashMap<String, Function<TriggerMeta, String>> triggerTitleAndValueMapping() {
+        LinkedHashMap<String, Function<TriggerMeta, String>> mapping = new LinkedHashMap<>();
+        mapping.put("Name", TriggerMeta::getName);
+        mapping.put("Timing", trigger -> trigger.getTiming() + " " + trigger.getManipulation());
+        mapping.put("Statement", trigger -> trigger.getStatement().replace("\n", " ")
+                .replace("\r", " "));
+        mapping.put("Create At", TriggerMeta::getCreateAt);
+        return mapping;
+    }
+}

meta/src/main/java/com/databasir/core/render/markdown/MarkdownBuilder.java

@@ -0,0 +1,108 @@
+package com.databasir.core.render.markdown;
+
+import java.util.List;
+
+public class MarkdownBuilder {
+
+    private static final String LINE = "\n";
+
+    private static final String DOUBLE_LINE = LINE + LINE;
+
+    private StringBuilder builder = new StringBuilder(1024);
+
+    private MarkdownBuilder() {
+    }
+
+    public static MarkdownBuilder builder() {
+        return new MarkdownBuilder();
+    }
+
+    public MarkdownBuilder primaryTitle(String title) {
+        builder.append("# ").append(title).append(DOUBLE_LINE);
+        return this;
+    }
+
+    public MarkdownBuilder secondTitle(String title) {
+        builder.append("## ").append(title).append(DOUBLE_LINE);
+        return this;
+    }
+
+    public MarkdownBuilder thirdTitle(String title) {
+        builder.append("### ").append(title).append(DOUBLE_LINE);
+        return this;
+    }
+
+    public MarkdownBuilder text(String text) {
+        builder.append(text).append(DOUBLE_LINE);
+        return this;
+    }
+
+    public MarkdownBuilder table(List<String> titles, List<List<String>> rows) {
+        if (titles == null || titles.isEmpty()) {
+            throw new IllegalArgumentException("titles must not be null or empty");
+        }
+        // build titles
+        builder.append("| ");
+        for (String title : titles) {
+            builder.append(title).append(" | ");
+        }
+        builder.append(LINE);
+
+        // build separators
+        builder.append("| ");
+        for (String title : titles) {
+            builder.append("------").append(" | ");
+        }
+        builder.append(LINE);
+
+        // build rows
+        for (List<String> row : rows) {
+            builder.append("| ");
+            for (String column : row) {
+                builder.append(column).append(" | ");
+            }
+            builder.append(LINE);
+        }
+        builder.append(LINE);
+        return this;
+    }
+
+    public MarkdownBuilder orderedList(List<String> list) {
+        for (int i = 0; i < list.size(); i++) {
+            builder.append(i + 1).append(". ").append(list.get(i)).append(LINE);
+        }
+        builder.append(LINE);
+        return this;
+    }
+
+    public MarkdownBuilder unorderedList(List<String> list) {
+        for (String item : list) {
+            builder.append("- ").append(item).append(LINE);
+        }
+        builder.append(LINE);
+        return this;
+    }
+
+    public MarkdownBuilder blockquotes(String content) {
+        builder.append("> ").append(content).append(DOUBLE_LINE);
+        return this;
+    }
+
+    public MarkdownBuilder code(String languageType, String statement) {
+        builder.append("```").append(languageType).append(LINE)
+                .append(statement)
+                .append("```")
+                .append(DOUBLE_LINE);
+        return this;
+    }
+
+    public MarkdownBuilder link(String text, String link) {
+        builder.append("[").append(text).append("]")
+                .append("(").append(link).append(")");
+        return this;
+    }
+
+    public String build() {
+        return builder.toString();
+    }
+}

meta/src/main/java/com/databasir/core/render/markdown/MarkdownRender.java

@@ -0,0 +1,114 @@
+package com.databasir.core.render.markdown;
+
+import com.databasir.core.meta.data.DatabaseMeta;
+import com.databasir.core.meta.data.TableMeta;
+import com.databasir.core.render.Render;
+import com.databasir.core.render.RenderConfig;
+import lombok.Getter;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class MarkdownRender implements Render {
+
+    @Getter
+    private final RenderConfig config;
+
+    protected MarkdownRender(RenderConfig config) {
+        this.config = config;
+    }
+
+    public static MarkdownRender of(RenderConfig config) {
+        return new MarkdownRender(config);
+    }
+
+    @Override
+    public void rendering(DatabaseMeta meta,
+                          OutputStream outputStream) throws IOException {
+        MarkdownBuilder contentBuilder = MarkdownBuilder.builder();
+        contentBuilder.primaryTitle(meta.getDatabaseName());
+        if (config.getRenderTables()) {
+            for (TableMeta table : meta.getTables()) {
+                buildTableName(contentBuilder, table);
+                if (config.getRenderColumns()) {
+                    buildColumns(contentBuilder, table);
+                }
+                if (config.getRenderIndexes()) {
+                    buildIndexes(contentBuilder, table);
+                }
+                if (config.getRenderTriggers()) {
+                    buildTriggers(contentBuilder, table);
+                }
+            }
+        }
+        outputStream.write(contentBuilder.build().getBytes(StandardCharsets.UTF_8));
+    }
+
+    private void buildTableName(MarkdownBuilder contentBuilder, TableMeta table) {
+        String tableName;
+        if (table.getComment().isEmpty()) {
+            tableName = table.getName();
+        } else {
+            tableName = table.getName() + "(" + table.getComment() + ")";
+        }
+        contentBuilder.secondTitle(tableName);
+    }
+
+    private void buildColumns(MarkdownBuilder contentBuilder, TableMeta table) {
+        contentBuilder.unorderedList(Collections.singletonList("columns"));
+        List<List<String>> allColumnRows = table.getColumns()
+                .stream()
+                .map(column -> config.getColumnTitleAndValueMapping()
+                        .values()
+                        .stream()
+                        .map(mapping -> mapping.apply(column))
+                        .collect(Collectors.toList()))
+                .collect(Collectors.toList());
+        contentBuilder.table(tableTitles(), allColumnRows);
+    }
+
+    private void buildIndexes(MarkdownBuilder contentBuilder, TableMeta table) {
+        contentBuilder.unorderedList(Collections.singletonList("indexes"));
+        List<List<String>> allIndexRows = table.getIndexes().stream()
+                .map(index -> config.getIndexTitleAndValueMapping()
+                        .values()
+                        .stream()
+                        .map(mapping -> mapping.apply(index))
+                        .collect(Collectors.toList()))
+                .collect(Collectors.toList());
+        contentBuilder.table(indexTitles(), allIndexRows);
+    }
+
+    private void buildTriggers(MarkdownBuilder contentBuilder, TableMeta table) {
+        if (table.getTriggers() == null || table.getTriggers().isEmpty()) {
+            return;
+        }
+
+        contentBuilder.unorderedList(Collections.singletonList("triggers"));
+        List<List<String>> allRows = table.getTriggers().stream()
+                .map(trigger -> config.getTriggerTitleAndValueMapping()
+                        .values()
+                        .stream()
+                        .map(mapping -> mapping.apply(trigger))
+                        .collect(Collectors.toList()))
+                .collect(Collectors.toList());
+        contentBuilder.table(triggerTitles(), allRows);
+    }
+
+    private List<String> tableTitles() {
+        return new ArrayList<>(config.getColumnTitleAndValueMapping().keySet());
+    }
+
+    private List<String> indexTitles() {
+        return new ArrayList<>(config.getIndexTitleAndValueMapping().keySet());
+    }
+
+    private List<String> triggerTitles() {
+        return new ArrayList<>(config.getTriggerTitleAndValueMapping().keySet());
+    }
+}

meta/src/main/java/com/databasir/core/render/markdown/MarkdownTemplateRender.java

@@ -0,0 +1,57 @@
+package com.databasir.core.render.markdown;
+
+import com.databasir.core.meta.data.DatabaseMeta;
+import com.databasir.core.render.Render;
+import com.databasir.core.render.RenderConfig;
+import freemarker.template.Configuration;
+import freemarker.template.Template;
+import freemarker.template.TemplateException;
+import freemarker.template.TemplateExceptionHandler;
+import lombok.RequiredArgsConstructor;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * use freemarker template to render markdown
+ */
+@RequiredArgsConstructor
+public class MarkdownTemplateRender implements Render {
+
+    private final RenderConfig renderConfig;
+
+    private String templatePath = "template/render/markdown/markdown.ftlh";
+
+    public MarkdownTemplateRender(RenderConfig config, String templatePath) {
+        this(config);
+        this.templatePath = templatePath;
+    }
+
+    @Override
+    public void rendering(DatabaseMeta meta, OutputStream outputStream) throws IOException {
+        doRendering(meta, outputStream);
+    }
+
+    public void doRendering(DatabaseMeta meta, OutputStream outputStream) throws IOException {
+        Configuration cfg = new Configuration(Configuration.VERSION_2_3_29);
+        cfg.setClassForTemplateLoading(getClass(), "/");
+        cfg.setDefaultEncoding("UTF-8");
+        cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
+        cfg.setLogTemplateExceptions(false);
+        cfg.setWrapUncheckedExceptions(true);
+        cfg.setFallbackOnNullLoopVariable(false);
+
+        Map<String, Object> root = new HashMap<>();
+        root.put("meta", meta);
+        root.put("config", renderConfig);
+        Template template = cfg.getTemplate(templatePath);
+        try {
+            template.process(root, new OutputStreamWriter(outputStream));
+        } catch (TemplateException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+}

meta/src/main/resources/template/render/markdown/markdown.ftlh

@@ -0,0 +1,49 @@
+# ${meta.databaseName}
+|                 |      |
+| --------------- | ---- |
+| Database name   |      |
+| Product name    |      |
+| Product version |      |
+
+## Overview
+|  | name | type | comment |
+| ---- | --------------- | ------ | ------ |
+<#list meta.tables as table>
+| ${table_index+1} | [${table.name}](#${table.name}) |  ${table.type} |  ${table.comment!'N/A'} |
+</#list>
+
+<#if config.renderTables>
+    <#list meta.tables as table>
+## ${table.name}
+        <#if config.renderColumns>
+### Columns
+
+|  | name | type | primary Key | nullable | auto increment| default | comment |
+| --- | ---- | ---- | ----------- | -------- | ------------- | ------- | ------- |
+            <#list table.columns as column>
+| ${column_index+1} | ${column.name} | ${column.type} | ${column.isPrimaryKey?then('YES','NO')} | ${column.nullable } | ${column.autoIncrement} | ${column.defaultValue!'NULL'} | ${column.comment!''} |
+            </#list>
+        </#if>
+
+<#if config.renderIndexes>
+### Indexes
+
+|  | name | unique | columns |
+| --- | ---- | ------ | ------- |
+       <#list table.indexes as index>
+| ${index_index+1} | ${index.name} | ${index.isUniqueKey?then('YES', 'NO')} | ${index.columnNames?join(', ')} |
+       </#list>
+    </#if>
+
+   <#if config.renderTriggers>
+### Triggers
+
+|  | name | timing | statement | created |
+| --- | ---- | ------ | --------- | ------- |
+    <#list table.triggers as trigger>
+| ${trigger_index} | ${trigger.name} | ${trigger.timing + " " + trigger.manipulation } | ${trigger.statement?replace("\n", "<br>")?replace("\r", " ")} | ${trigger.createAt} |
+    </#list>
+   </#if>
+
+    </#list>
+</#if>

meta/src/test/java/com/databasir/core/diff/service/DiffsTest.java

@@ -0,0 +1,597 @@
+package com.databasir.core.diff.service;
+
+import com.databasir.core.diff.Diffs;
+import com.databasir.core.diff.data.DiffType;
+import com.databasir.core.diff.data.FieldDiff;
+import com.databasir.core.diff.data.RootDiff;
+import com.databasir.core.meta.data.*;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.TimeZone;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class DiffsTest {
+
+    private static ObjectMapper objectMapper;
+
+    @BeforeAll
+    static void init() {
+        objectMapper = new ObjectMapper();
+        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_ABSENT)
+                .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
+                .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
+                .disable(DeserializationFeature.READ_DATE_TIMESTAMPS_AS_NANOSECONDS)
+                .disable(SerializationFeature.WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS)
+                .setTimeZone(TimeZone.getDefault());
+    }
+
+    @Test
+    void diffEmptyDatabaseSame() {
+        DatabaseMeta original = DatabaseMeta.builder().build();
+        DatabaseMeta current = DatabaseMeta.builder().build();
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.NONE, diff.getDiffType());
+    }
+
+    @Test
+    void diffDatabaseSame() {
+        DatabaseMeta original = load("ut/diffsTest/diffDatabaseSame/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffDatabaseSame/current.json");
+
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.NONE, diff.getDiffType());
+        assertSame(1, diff.getFields().size());
+        FieldDiff tableField = diff.getFields().iterator().next();
+        assertEquals("tables", tableField.getFieldName());
+        assertEquals(DiffType.NONE, tableField.getDiffType());
+        assertTrue(tableField.getFields().isEmpty());
+    }
+
+    @Test
+    void diffDatabaseAdded() {
+        DatabaseMeta current = load("ut/diffsTest/diffDatabaseAdded/current.json");
+        RootDiff diff = Diffs.diff(null, current);
+        assertEquals(DiffType.ADDED, diff.getDiffType());
+    }
+
+    @Test
+    void diffDatabaseRemoved() {
+        DatabaseMeta original = load("ut/diffsTest/diffDatabaseRemoved/original.json");
+        RootDiff diff = Diffs.diff(original, null);
+        assertEquals(DiffType.REMOVED, diff.getDiffType());
+    }
+
+    @Test
+    void diffDatabaseModified() {
+        DatabaseMeta original = load("ut/diffsTest/diffDatabaseModified/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffDatabaseModified/current.json");
+
+        // database
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+        assertSame(2, diff.getFields().size());
+        Map<String, FieldDiff> diffMap = diff.getFields()
+                .stream()
+                .collect(Collectors.toMap(d -> d.getFieldName(), Function.identity()));
+
+        // productVersion
+        assertTrue(diffMap.containsKey("productVersion"));
+        assertIsModified(diffMap.get("productVersion"));
+        assertEquals(original.getProductVersion(), diffMap.get("productVersion").getOriginal());
+        assertEquals(current.getProductVersion(), diffMap.get("productVersion").getCurrent());
+
+        // tables
+        assertTrue(diffMap.containsKey("tables"));
+        assertIsNone(diffMap.get("tables"));
+        assertTrue(diffMap.get("tables").getFields().isEmpty());
+    }
+
+    @Test
+    void diffTableAdded() {
+        DatabaseMeta original = load("ut/diffsTest/diffTableAdded/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffTableAdded/current.json");
+
+        // database
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+
+        // add table: departments, dept_emp
+        assertSame(1, diff.getFields().size());
+        FieldDiff tableField = diff.getFields().iterator().next();
+        assertEquals("tables", tableField.getFieldName());
+        assertEquals(DiffType.ADDED, tableField.getDiffType());
+
+        // tables without original & current value
+        assertNull(tableField.getOriginal());
+        assertNull(tableField.getCurrent());
+
+        // add two tables
+        assertSame(2, tableField.getFields().size());
+        Map<String, FieldDiff> tableFieldMap = tableField.getFields()
+                .stream()
+                .collect(Collectors.toMap(FieldDiff::getFieldName, Function.identity()));
+        Map<String, TableMeta> currentTablesMap = current.getTables()
+                .stream()
+                .collect(Collectors.toMap(TableMeta::getName, Function.identity()));
+
+        List.of("departments", "dept_emp").forEach(tableName -> {
+            assertTrue(tableFieldMap.containsKey(tableName));
+            FieldDiff departments = tableFieldMap.get(tableName);
+            assertIsAdded(departments);
+            assertNull(departments.getOriginal());
+            assertNotNull(departments.getCurrent());
+            assertEquals(currentTablesMap.get(tableName), departments.getCurrent());
+        });
+    }
+
+    @Test
+    void diffTableRemoved() {
+        DatabaseMeta original = load("ut/diffsTest/diffTableRemoved/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffTableRemoved/current.json");
+
+        // database
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+
+        // remove table: departments, dept_emp
+        assertSame(1, diff.getFields().size());
+        FieldDiff tableField = diff.getFields().iterator().next();
+        assertEquals("tables", tableField.getFieldName());
+        assertEquals(DiffType.REMOVED, tableField.getDiffType());
+
+        // tables without original & current value
+        assertNull(tableField.getOriginal());
+        assertNull(tableField.getCurrent());
+
+        // remove two tables
+        assertSame(2, tableField.getFields().size());
+        Map<String, FieldDiff> tableFieldMap = tableField.getFields()
+                .stream()
+                .collect(Collectors.toMap(FieldDiff::getFieldName, Function.identity()));
+        Map<String, TableMeta> originalTablesMap = original.getTables()
+                .stream()
+                .collect(Collectors.toMap(TableMeta::getName, Function.identity()));
+
+        List.of("departments", "dept_emp").forEach(tableName -> {
+            assertTrue(tableFieldMap.containsKey(tableName));
+            FieldDiff field = tableFieldMap.get(tableName);
+            assertIsRemoved(field);
+            assertNull(field.getCurrent());
+            assertNotNull(field.getOriginal());
+            assertEquals(originalTablesMap.get(tableName), field.getOriginal());
+        });
+    }
+
+    /**
+     * modify three table: departments, dept_emp
+     * - dept_manager: add comment, change table type
+     * - departments: add comment
+     * - dept_emp: add comment
+     */
+    @Test
+    void diffTableModified() {
+        DatabaseMeta original = load("ut/diffsTest/diffTableModified/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffTableModified/current.json");
+
+        // database
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+
+        assertSame(1, diff.getFields().size());
+        FieldDiff tableField = diff.getFields().iterator().next();
+        assertEquals("tables", tableField.getFieldName());
+        assertEquals(DiffType.MODIFIED, tableField.getDiffType());
+
+        // tables without original & current value
+        assertNull(tableField.getOriginal());
+        assertNull(tableField.getCurrent());
+
+        // modify 3 tables
+        assertSame(3, tableField.getFields().size());
+        Map<String, FieldDiff> tableFieldMap = tableField.getFields()
+                .stream()
+                .collect(Collectors.toMap(FieldDiff::getFieldName, Function.identity()));
+        Map<String, TableMeta> originalTableMap = original.getTables()
+                .stream()
+                .collect(Collectors.toMap(TableMeta::getName, Function.identity()));
+        Map<String, TableMeta> currentTableMap = current.getTables()
+                .stream()
+                .collect(Collectors.toMap(TableMeta::getName, Function.identity()));
+
+        List.of("departments", "dept_emp", "dept_manager").forEach(tableName -> {
+            assertTrue(tableFieldMap.containsKey(tableName));
+            FieldDiff departments = tableFieldMap.get(tableName);
+            assertIsModified(departments);
+            assertNull(departments.getCurrent());
+            assertNull(departments.getOriginal());
+            if ("dept_manager".equals(tableName)) {
+                // columns \ indexes \ triggers \ forgienKes \ comment
+                assertSame(6, departments.getFields().size());
+                FieldDiff departmentCommentField = departments.getFields().stream()
+                        .filter(f -> f.getFieldName().equals("type"))
+                        .findAny()
+                        .orElseThrow();
+                assertEquals(originalTableMap.get(tableName).getType(), departmentCommentField.getOriginal());
+                assertEquals(currentTableMap.get(tableName).getType(), departmentCommentField.getCurrent());
+            } else {
+                // columns \ indexes \ triggers \ forgienKes \ comment
+                assertSame(5, departments.getFields().size());
+            }
+
+            FieldDiff departmentCommentField = departments.getFields().stream()
+                    .filter(f -> f.getFieldName().equals("comment"))
+                    .findAny()
+                    .orElseThrow();
+            assertEquals(originalTableMap.get(tableName).getComment(), departmentCommentField.getOriginal());
+            assertEquals(currentTableMap.get(tableName).getComment(), departmentCommentField.getCurrent());
+        });
+    }
+
+    /**
+     * add columns \ indexes \ triggers \ foreignKeys
+     * <p>
+     * department:
+     * - add column [deleted], [dept_code]
+     * - add index [dept_deleted]
+     * - add triggers [before_insert]
+     * - add foreignKeys [dept_emp_ibfk_1]
+     * </p>
+     */
+    @Test
+    void diffTableFieldsAdded() {
+        DatabaseMeta original = load("ut/diffsTest/diffTableFieldsAdded/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffTableFieldsAdded/current.json");
+
+        // database
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+
+        // modified table: departments
+        assertSame(1, diff.getFields().size());
+        FieldDiff tableField = diff.getFields().iterator().next();
+        assertEquals("tables", tableField.getFieldName());
+        assertEquals(DiffType.MODIFIED, tableField.getDiffType());
+
+        // tables without original & current value
+        assertNull(tableField.getOriginal());
+        assertNull(tableField.getCurrent());
+
+        // modified 1 tables
+        assertSame(1, tableField.getFields().size());
+        Map<String, FieldDiff> tableFieldMap = tableField.getFields()
+                .stream()
+                .collect(Collectors.toMap(FieldDiff::getFieldName, Function.identity()));
+        TableMeta currentDepartment = current.getTables()
+                .stream()
+                .filter(t -> "departments".equals(t.getName()))
+                .findFirst()
+                .orElseThrow();
+
+        List.of("departments").forEach(tableName -> {
+            assertTrue(tableFieldMap.containsKey(tableName));
+            FieldDiff departments = tableFieldMap.get(tableName);
+            assertIsModified(departments);
+            assertNull(departments.getOriginal());
+            assertNull(departments.getCurrent());
+
+            // columns / indexes / triggers / foreignKes
+            assertSame(4, departments.getFields().size());
+            for (FieldDiff field : departments.getFields()) {
+                assertIsModified(field);
+                if ("columns".equals(field.getFieldName())) {
+                    assertSame(2, field.getFields().size());
+                    for (FieldDiff columnField : field.getFields()) {
+                        assertIsAdded(columnField);
+                        assertNull(columnField.getOriginal());
+                        assertNotNull(columnField.getCurrent());
+                        ColumnMeta colMeta = (ColumnMeta) columnField.getCurrent();
+                        boolean matched = currentDepartment.getColumns().stream()
+                                .anyMatch(idx -> Objects.equals(idx, colMeta));
+                        assertTrue(matched);
+                    }
+                }
+                if ("indexes".equals(field.getFieldName())) {
+                    assertSame(1, field.getFields().size());
+                    FieldDiff indexes = field.getFields().iterator().next();
+                    assertIsAdded(indexes);
+                    assertNull(indexes.getOriginal());
+                    IndexMeta index = (IndexMeta) indexes.getCurrent();
+                    assertNotNull(index);
+                    boolean matched = currentDepartment.getIndexes().stream()
+                            .anyMatch(idx -> Objects.equals(idx, index));
+                    assertTrue(matched);
+                }
+                if ("triggers".equals(field.getFieldName())) {
+                    assertSame(1, field.getFields().size());
+                    FieldDiff triggers = field.getFields().iterator().next();
+                    assertIsAdded(triggers);
+                    assertNull(triggers.getOriginal());
+                    TriggerMeta tg = (TriggerMeta) triggers.getCurrent();
+                    assertNotNull(tg);
+                    boolean matched = currentDepartment.getTriggers().stream().anyMatch(t -> Objects.equals(t, tg));
+                    assertTrue(matched);
+                }
+                if ("foreignKeys".equals(field.getFieldName())) {
+                    assertSame(1, field.getFields().size());
+                    FieldDiff foreignKeys = field.getFields().iterator().next();
+                    assertIsAdded(foreignKeys);
+                    assertNull(foreignKeys.getOriginal());
+                    ForeignKeyMeta fk = (ForeignKeyMeta) foreignKeys.getCurrent();
+                    assertNotNull(fk);
+                    boolean matched = currentDepartment.getForeignKeys().stream().anyMatch(f -> Objects.equals(f, fk));
+                    assertTrue(matched);
+                }
+            }
+        });
+    }
+
+    /**
+     * dept_emp
+     * fk: dept_emp_ibfk_2
+     * column: from_date, to_date
+     * index: dept_no
+     * trigger: before_insert
+     */
+    @Test
+    void diffTableFieldsRemoved() {
+        DatabaseMeta original = load("ut/diffsTest/diffTableFieldsRemoved/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffTableFieldsRemoved/current.json");
+
+        // database
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+
+        // modified table: departments
+        assertSame(1, diff.getFields().size());
+        FieldDiff tableField = diff.getFields().iterator().next();
+        assertEquals("tables", tableField.getFieldName());
+        assertEquals(DiffType.MODIFIED, tableField.getDiffType());
+
+        // tables without original & current value
+        assertNull(tableField.getOriginal());
+        assertNull(tableField.getCurrent());
+
+        // modified 1 tables
+        assertSame(1, tableField.getFields().size());
+        Map<String, FieldDiff> tableFieldMap = tableField.getFields()
+                .stream()
+                .collect(Collectors.toMap(FieldDiff::getFieldName, Function.identity()));
+        TableMeta originalTable = original.getTables()
+                .stream()
+                .filter(t -> "dept_emp".equals(t.getName()))
+                .findFirst()
+                .orElseThrow();
+
+        List.of("dept_emp").forEach(tableName -> {
+            assertTrue(tableFieldMap.containsKey(tableName));
+            FieldDiff departments = tableFieldMap.get(tableName);
+            assertIsModified(departments);
+            assertNull(departments.getOriginal());
+            assertNull(departments.getCurrent());
+
+            // columns / indexes / triggers / foreignKes
+            assertSame(4, departments.getFields().size());
+            for (FieldDiff field : departments.getFields()) {
+                assertIsModified(field);
+                if ("columns".equals(field.getFieldName())) {
+                    assertSame(2, field.getFields().size());
+                    for (FieldDiff columnField : field.getFields()) {
+                        assertIsRemoved(columnField);
+                        assertNull(columnField.getCurrent());
+                        assertNotNull(columnField.getOriginal());
+                        ColumnMeta colMeta = (ColumnMeta) columnField.getOriginal();
+                        boolean matched = originalTable.getColumns().stream()
+                                .anyMatch(idx -> Objects.equals(idx, colMeta));
+                        assertTrue(matched);
+                    }
+                }
+                if ("indexes".equals(field.getFieldName())) {
+                    assertSame(1, field.getFields().size());
+                    FieldDiff indexes = field.getFields().iterator().next();
+                    assertIsRemoved(indexes);
+                    assertNull(indexes.getCurrent());
+                    IndexMeta index = (IndexMeta) indexes.getOriginal();
+                    assertNotNull(index);
+                    boolean matched = originalTable.getIndexes().stream()
+                            .anyMatch(idx -> Objects.equals(idx, index));
+                    assertTrue(matched);
+                }
+                if ("triggers".equals(field.getFieldName())) {
+                    assertSame(1, field.getFields().size());
+                    FieldDiff triggers = field.getFields().iterator().next();
+                    assertIsRemoved(triggers);
+                    assertNull(triggers.getCurrent());
+                    TriggerMeta tg = (TriggerMeta) triggers.getOriginal();
+                    assertNotNull(tg);
+                    boolean matched = originalTable.getTriggers().stream().anyMatch(t -> Objects.equals(t, tg));
+                    assertTrue(matched);
+                }
+                if ("foreignKeys".equals(field.getFieldName())) {
+                    assertSame(1, field.getFields().size());
+                    FieldDiff foreignKeys = field.getFields().iterator().next();
+                    assertIsRemoved(foreignKeys);
+                    assertNull(foreignKeys.getCurrent());
+                    ForeignKeyMeta fk = (ForeignKeyMeta) foreignKeys.getOriginal();
+                    assertNotNull(fk);
+                    boolean matched = originalTable.getForeignKeys().stream().anyMatch(f -> Objects.equals(f, fk));
+                    assertTrue(matched);
+                }
+            }
+        });
+    }
+
+
+    /**
+     * departments
+     * column: dept_no add comment
+     * column: dept_name add comment
+     * indexes: dept_name change unique=false
+     * <p>
+     * dept_emp
+     * column: emp_no change default value
+     * column: dept_noL change auto increment true
+     * indexes: dept_no
+     * triggers: before_insert
+     * foreignKeys: dept_emp_ibfk_2
+     * </p>
+     */
+    @Test
+    void diffTableFieldsModified() {
+        DatabaseMeta original = load("ut/diffsTest/diffTableFieldsModified/original.json");
+        DatabaseMeta current = load("ut/diffsTest/diffTableFieldsModified/current.json");
+
+        // database
+        RootDiff diff = Diffs.diff(original, current);
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+
+        // modified table: departments, dept_emp
+        assertSame(1, diff.getFields().size());
+        FieldDiff tablesField = diff.getFields().iterator().next();
+        assertEquals("tables", tablesField.getFieldName());
+        assertEquals(DiffType.MODIFIED, tablesField.getDiffType());
+
+        // tables without original & current value
+        assertNull(tablesField.getOriginal());
+        assertNull(tablesField.getCurrent());
+
+        // modified 1 tables
+        assertSame(2, tablesField.getFields().size());
+        Map<String, FieldDiff> tableFieldMap = tablesField.getFields()
+                .stream()
+                .collect(Collectors.toMap(FieldDiff::getFieldName, Function.identity()));
+        Map<String, TableMeta> originalTaleMap = original.getTables()
+                .stream()
+                .collect(Collectors.toMap(TableMeta::getName, Function.identity()));
+        Map<String, TableMeta> currentTableMap = current.getTables()
+                .stream()
+                .collect(Collectors.toMap(TableMeta::getName, Function.identity()));
+
+        List.of("departments", "dept_emp").forEach(tableName -> {
+            assertTrue(tableFieldMap.containsKey(tableName));
+            FieldDiff tableField = tableFieldMap.get(tableName);
+            assertIsModified(tableField);
+            assertNull(tableField.getOriginal());
+            assertNull(tableField.getCurrent());
+
+            // columns / indexes / triggers / foreignKes
+            assertSame(4, tableField.getFields().size());
+            for (FieldDiff field : tableField.getFields()) {
+                if ("columns".equals(field.getFieldName())) {
+                    assertIsModified(field);
+                    assertSame(2, field.getFields().size());
+                    for (FieldDiff columnField : field.getFields()) {
+                        assertIsModified(columnField);
+                        assertNotNull(columnField.getCurrent());
+                        assertNotNull(columnField.getOriginal());
+                        ColumnMeta originalCol = (ColumnMeta) columnField.getOriginal();
+                        boolean matched = originalTaleMap.get(tableName)
+                                .getColumns()
+                                .stream()
+                                .anyMatch(idx -> Objects.equals(idx, originalCol));
+                        assertTrue(matched);
+
+                        ColumnMeta currentCol = (ColumnMeta) columnField.getCurrent();
+                        assertTrue(currentTableMap.get(tableName)
+                                .getColumns()
+                                .stream()
+                                .anyMatch(idx -> Objects.equals(idx, currentCol)));
+                    }
+                }
+                if ("indexes".equals(field.getFieldName())) {
+                    assertIsModified(field);
+                    assertSame(1, field.getFields().size());
+                    FieldDiff indexes = field.getFields().iterator().next();
+                    assertIsModified(indexes);
+                    assertNotNull(indexes.getCurrent());
+                    assertNotNull(indexes.getOriginal());
+
+                    IndexMeta originalIndex = (IndexMeta) indexes.getOriginal();
+                    boolean matched = originalTaleMap.get(tableName)
+                            .getIndexes()
+                            .stream()
+                            .anyMatch(idx -> Objects.equals(idx, originalIndex));
+                    assertTrue(matched);
+
+                    IndexMeta currentIndex = (IndexMeta) indexes.getCurrent();
+                    assertTrue(currentTableMap.get(tableName)
+                            .getIndexes()
+                            .stream()
+                            .anyMatch(idx -> Objects.equals(idx, currentIndex)));
+                }
+                if (tableName.equals("dept_emp") && "triggers".equals(field.getFieldName())) {
+                    assertIsModified(field);
+                    assertSame(1, field.getFields().size());
+                    FieldDiff triggers = field.getFields().iterator().next();
+                    assertIsModified(triggers);
+                    assertNotNull(triggers.getCurrent());
+                    assertNotNull(triggers.getOriginal());
+                    TriggerMeta originalTg = (TriggerMeta) triggers.getOriginal();
+                    assertTrue(originalTaleMap.get(tableName).getTriggers().stream()
+                            .anyMatch(t -> Objects.equals(t, originalTg)));
+
+                    TriggerMeta currentTg = (TriggerMeta) triggers.getCurrent();
+                    assertTrue(currentTableMap.get(tableName).getTriggers().stream()
+                            .anyMatch(t -> Objects.equals(t, currentTg)));
+                }
+                if (tableName.equals("dept_emp") && "foreignKeys".equals(field.getFieldName())) {
+                    assertIsModified(field);
+                    assertSame(1, field.getFields().size());
+                    FieldDiff foreignKeys = field.getFields().iterator().next();
+                    assertIsModified(foreignKeys);
+                    assertNotNull(foreignKeys.getCurrent());
+                    assertNotNull(foreignKeys.getOriginal());
+                    ForeignKeyMeta originalFk = (ForeignKeyMeta) foreignKeys.getOriginal();
+                    assertTrue(originalTaleMap.get(tableName)
+                            .getForeignKeys().stream().anyMatch(f -> Objects.equals(f, originalFk)));
+
+                    ForeignKeyMeta currentFk = (ForeignKeyMeta) foreignKeys.getCurrent();
+                    assertTrue(currentTableMap.get(tableName)
+                            .getForeignKeys().stream().anyMatch(f -> Objects.equals(f, currentFk)));
+                }
+                if (tableName.equals("departments")
+                        && List.of("foreignKeys", "triggers").contains(field.getFieldName())) {
+                    assertIsNone(field);
+                }
+            }
+        });
+    }
+
+    private void assertIsModified(FieldDiff diff) {
+        assertEquals(DiffType.MODIFIED, diff.getDiffType());
+    }
+
+    private void assertIsNone(FieldDiff diff) {
+        assertEquals(DiffType.NONE, diff.getDiffType());
+    }
+
+    private void assertIsRemoved(FieldDiff diff) {
+        assertEquals(DiffType.REMOVED, diff.getDiffType());
+    }
+
+    private void assertIsAdded(FieldDiff diff) {
+        assertEquals(DiffType.ADDED, diff.getDiffType());
+    }
+
+    private DatabaseMeta load(String url) {
+        URL originalUrl = Thread.currentThread().getContextClassLoader()
+                .getResource(url);
+        try {
+            return objectMapper.readValue(originalUrl, DatabaseMeta.class);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseAdded/current.json

@@ -0,0 +1,466 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseAdded/original.json

@@ -0,0 +1,3 @@
+{
+
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseModified/current.json

@@ -0,0 +1,470 @@
+{
+  "databaseName": "employees",
+  "schemaName": "employees",
+  "productName": "MySQL",
+  "productVersion": "8.0.26",
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseModified/original.json

@@ -0,0 +1,470 @@
+{
+  "databaseName": "employees",
+  "schemaName": "employees",
+  "productName": "MySQL",
+  "productVersion": "9.0",
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseRemoved/current.json

@@ -0,0 +1,3 @@
+{
+
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseRemoved/original.json

@@ -0,0 +1,466 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseSame/current.json

@@ -0,0 +1,466 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffDatabaseSame/original.json

@@ -0,0 +1,466 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableAdded/current.json

@@ -0,0 +1,466 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableAdded/original.json

@@ -0,0 +1,328 @@
+{
+  "tables": [
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableFieldsAdded/current.json

@@ -0,0 +1,514 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_code",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "deleted",
+          "type": "bool",
+          "size": 1,
+          "decimalDigits": 1,
+          "comment": "delete flag",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": 1
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "dept_deleted",
+          "isUniqueKey": false,
+          "columnNames": [
+            "deleted"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": [
+        {
+          "name": "before_insert",
+          "timing": "BEFORE",
+          "manipulation": "INSERT",
+          "statement": "set null",
+          "createAt": "2022-01-01"
+        }
+      ]
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableFieldsAdded/original.json

@@ -0,0 +1,466 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableFieldsModified/current.json

@@ -0,0 +1,474 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "department unique no",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "department unique name",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": -1
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "YES",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "NONE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": [
+        {
+          "name": "before_insert",
+          "timing": "AFTER",
+          "manipulation": "INSERT",
+          "statement": "set null",
+          "createAt": "2022-01-01"
+        }
+      ]
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableFieldsModified/original.json

@@ -0,0 +1,472 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": [{
+        "name": "before_insert",
+        "timing": "BEFORE",
+        "manipulation": "INSERT",
+        "statement": "set null",
+        "createAt": "2022-01-01"
+      }]
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableFieldsRemoved/current.json

@@ -0,0 +1,428 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableFieldsRemoved/original.json

@@ -0,0 +1,474 @@
+{
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": [
+        {
+          "name": "before_insert",
+          "timing": "BEFORE",
+          "manipulation": "INSERT",
+          "statement": "set null",
+          "createAt": "2022-01-01"
+        }
+      ]
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableModified/current.json

@@ -0,0 +1,470 @@
+{
+  "databaseName": "employees",
+  "schemaName": "employees",
+  "productName": "MySQL",
+  "productVersion": "9.0",
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "部门信息",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "员工部门关系",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE2",
+      "comment": "部门经理关系",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableModified/original.json

@@ -0,0 +1,470 @@
+{
+  "databaseName": "employees",
+  "schemaName": "employees",
+  "productName": "MySQL",
+  "productVersion": "9.0",
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableRemoved/current.json

@@ -0,0 +1,332 @@
+{
+  "databaseName": "employees",
+  "schemaName": "employees",
+  "productName": "MySQL",
+  "productVersion": "9.0",
+  "tables": [
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}

meta/src/test/resources/ut/diffsTest/diffTableRemoved/original.json

@@ -0,0 +1,470 @@
+{
+  "databaseName": "employees",
+  "schemaName": "employees",
+  "productName": "MySQL",
+  "productVersion": "9.0",
+  "tables": [
+    {
+      "name": "departments",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_name",
+          "type": "VARCHAR",
+          "size": 40,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_name",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_name"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "dept_emp",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_emp_ibfk_2",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_emp_ibfk_1",
+          "fkTableName": "dept_emp",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "dept_manager",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "dept_no",
+          "type": "CHAR",
+          "size": 4,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "dept_no",
+          "isUniqueKey": false,
+          "columnNames": [
+            "dept_no"
+          ]
+        },
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "dept_no"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "dept_manager_ibfk_2",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "dept_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "departments",
+          "pkColumnName": "dept_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        },
+        {
+          "fkName": "dept_manager_ibfk_1",
+          "fkTableName": "dept_manager",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "employees",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "birth_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "first_name",
+          "type": "VARCHAR",
+          "size": 14,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "last_name",
+          "type": "VARCHAR",
+          "size": 16,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "gender",
+          "type": "ENUM",
+          "size": 1,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "hire_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no"
+          ]
+        }
+      ],
+      "foreignKeys": [],
+      "triggers": []
+    },
+    {
+      "name": "salaries",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "salary",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "salaries_ibfk_1",
+          "fkTableName": "salaries",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    },
+    {
+      "name": "titles",
+      "type": "TABLE",
+      "comment": "",
+      "columns": [
+        {
+          "name": "emp_no",
+          "type": "INT",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "title",
+          "type": "VARCHAR",
+          "size": 50,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "from_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": true,
+          "nullable": "NO",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        },
+        {
+          "name": "to_date",
+          "type": "DATE",
+          "size": 10,
+          "decimalDigits": null,
+          "comment": "",
+          "isPrimaryKey": false,
+          "nullable": "YES",
+          "autoIncrement": "NO",
+          "defaultValue": null
+        }
+      ],
+      "indexes": [
+        {
+          "name": "PRIMARY",
+          "isUniqueKey": true,
+          "columnNames": [
+            "emp_no",
+            "title",
+            "from_date"
+          ]
+        }
+      ],
+      "foreignKeys": [
+        {
+          "fkName": "titles_ibfk_1",
+          "fkTableName": "titles",
+          "fkColumnName": "emp_no",
+          "pkName": "PRIMARY",
+          "pkTableName": "employees",
+          "pkColumnName": "emp_no",
+          "updateRule": "CASCADE",
+          "deleteRule": "CASCADE"
+        }
+      ],
+      "triggers": []
+    }
+  ]
+}