feat: support version diff (#52)

* feat: implementation diff processor

* fix: checkstyle

* feat: ignore sync if without change

* fix: checkstyle

* feat:add databasir diff api

* feat:update frontend resources

api/src/main/java/com/databasir/api/DocumentController.java

@@ -1,6 +1,7 @@
 package com.databasir.api;
 
 import com.databasir.common.JsonData;
+import com.databasir.core.diff.data.RootDiff;
 import com.databasir.core.domain.document.data.DatabaseDocumentResponse;
 import com.databasir.core.domain.document.data.DatabaseDocumentSimpleResponse;
 import com.databasir.core.domain.document.data.DatabaseDocumentVersionResponse;
@@ -39,6 +40,13 @@ public class DocumentController {
         return JsonData.ok();
     }
 
+    @GetMapping(Routes.Document.DIFF)
+    public JsonData<RootDiff> diff(@PathVariable Integer projectId,
+                                   @RequestParam(name = "originalVersion") Long originalVersion,
+                                   @RequestParam(required = false) Long currentVersion) {
+        return JsonData.ok(documentService.diff(projectId, originalVersion, currentVersion));
+    }
+
     @GetMapping(Routes.Document.GET_ONE)
     public JsonData<DatabaseDocumentResponse> getByProjectId(@PathVariable Integer projectId,
                                                              @RequestParam(required = false) Long version) {

api/src/main/java/com/databasir/api/Routes.java

@@ -82,6 +82,8 @@ public interface Routes {
 
         String GET_TABLE_DETAIL = BASE + "/projects/{projectId}/documents/{documentId}/table_documents";
 
+        String DIFF = BASE + "/projects/{projectId}/diff_documents";
+
         String EXPORT = BASE + "/projects/{projectId}/document_files";
     }
 

api/src/main/resources/static/css/321.d892cf8e.css

@@ -0,0 +1 @@
+@-webkit-keyframes running-line{to{stroke-dashoffset:-1000}}@keyframes running-line{to{stroke-dashoffset:-1000}}.text{font-size:14px;line-height:1.3rem}.item{margin-top:10px;margin-right:40px}.remark-card{margin-bottom:30px}.remark-header{display:flex;justify-content:space-between;align-items:center}.remark-header .remark-user{color:#6d6d6d}.remark-header .remark-time{color:#6d6d6d;font-size:.8rem;margin-left:10px}.remark-content{white-space:pre-wrap;text-align:left}.badge-item{margin-top:18px;margin-bottom:6px}.h2{font-size:24px;color:#606266;margin-top:13px;margin-bottom:13px}.h2,.h3{font-family:Helvetica Neue,Helvetica,PingFang SC,Hiragino Sans GB,Microsoft YaHei,微软雅黑,Arial,sans-serif}.h3{font-size:20px;color:#909399;margin-top:18px;margin-bottom:18px}.removed-item{background-color:#fef0f0!important;color:#f56c6c}.added-item{background-color:#f0f9eb!important;color:#67c23a}.modified-item{background-color:#fdf6ec!important;color:#e6a23c}.modified-original-item{background-color:#fdf6ec!important;color:#a8abb2}.span-ellipsis{width:100%;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;flex:1;display:flex;align-items:left;justify-content:space-between;font-size:14px}.doc-toc-aside{overflow-wrap:break-word;text-overflow:ellipsis;bottom:0;top:100px;position:fixed;overflow-y:hidden;overflow-x:hidden;max-width:var(--el-aside-width);width:var(--el-aside-width);border-width:0 1px 0 0;border-color:#ddd;border-style:solid}.doc-toc-aside:hover{overflow-y:auto;scrollbar-width:thin}

api/src/main/resources/static/css/907.1437368b.css

@@ -1 +0,0 @@
-@-webkit-keyframes running-line{to{stroke-dashoffset:-1000}}@keyframes running-line{to{stroke-dashoffset:-1000}}.text{font-size:14px;line-height:1.3rem}.item{margin-top:10px;margin-right:40px}.remark-card{margin-bottom:30px}.remark-header{display:flex;justify-content:space-between;align-items:center}.remark-header .remark-user{color:#6d6d6d}.remark-header .remark-time{color:#6d6d6d;font-size:.8rem;margin-left:10px}.remark-content{white-space:pre-wrap;text-align:left}.span-ellipsis{width:100%;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;flex:1;display:flex;align-items:left;justify-content:space-between;font-size:14px}.doc-toc-aside{overflow-wrap:break-word;text-overflow:ellipsis;bottom:0;top:100px;position:fixed;overflow-y:hidden;overflow-x:hidden;max-width:var(--el-aside-width);width:var(--el-aside-width);border-width:0 1px 0 0;border-color:#ddd;border-style:solid}.doc-toc-aside:hover{overflow-y:auto;scrollbar-width:thin}

api/src/main/resources/static/index.html

@@ -1 +1 @@
-<!doctype html><html lang=""><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="/favicon.ico"><title>databasir-frontend</title><script defer="defer" type="module" src="/js/chunk-vendors.45746587.js"></script><script defer="defer" type="module" src="/js/app.e0747db1.js"></script><link href="/css/chunk-vendors.8e1003a6.css" rel="stylesheet"><link href="/css/app.757c1ef3.css" rel="stylesheet"><script defer="defer" src="/js/chunk-vendors-legacy.54c3660b.js" nomodule></script><script defer="defer" src="/js/app-legacy.e6a59dc2.js" nomodule></script></head><body><noscript><strong>We're sorry but databasir-frontend doesn't work properly without JavaScript enabled. Please enable it to continue.</strong></noscript><div id="app"></div></body></html>
+<!doctype html><html lang=""><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="/favicon.ico"><title>databasir-frontend</title><script defer="defer" type="module" src="/js/chunk-vendors.45746587.js"></script><script defer="defer" type="module" src="/js/app.08e3c996.js"></script><link href="/css/chunk-vendors.8e1003a6.css" rel="stylesheet"><link href="/css/app.757c1ef3.css" rel="stylesheet"><script defer="defer" src="/js/chunk-vendors-legacy.54c3660b.js" nomodule></script><script defer="defer" src="/js/app-legacy.3d5e4b5d.js" nomodule></script></head><body><noscript><strong>We're sorry but databasir-frontend doesn't work properly without JavaScript enabled. Please enable it to continue.</strong></noscript><div id="app"></div></body></html>

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api/src/main/resources/static/js/865.ebbb1893.js

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api/src/main/resources/static/js/865.ebbb1893.js.map

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api/src/main/resources/static/js/99-legacy.6cfcb3aa.js

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api/src/main/resources/static/js/99.79a6a4f8.js

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core/src/main/java/com/databasir/core/domain/DomainErrors.java

@@ -32,6 +32,7 @@ public enum DomainErrors implements DatabasirErrors {
     MUST_NOT_MODIFY_SYSTEM_DEFAULT_DATABASE_TYPE("A_10017", "禁止修改系统默认数据库类型"),
     DOWNLOAD_DRIVER_ERROR("A_10018", "驱动下载失败"),
     INVALID_DATABASE_TYPE_URL_PATTERN("A_10019", "不合法的 url pattern"),
+    DOCUMENT_VERSION_IS_INVALID("A_10020", "文档版本不合法"),
     ;
 
     private final String errCode;

core/src/main/java/com/databasir/core/domain/document/converter/BaseConverter.java

@@ -1,9 +0,0 @@
-package com.databasir.core.domain.document.converter;
-
-public interface BaseConverter {
-
-    @NullToEmpty
-    default String nullToEmpty(String s) {
-        return s == null ? "" : s;
-    }
-}

core/src/main/java/com/databasir/core/domain/document/converter/DatabaseMetaConverter.java

@@ -0,0 +1,71 @@
+package com.databasir.core.domain.document.converter;
+
+import com.databasir.core.infrastructure.converter.JsonConverter;
+import com.databasir.core.meta.data.ColumnMeta;
+import com.databasir.core.meta.data.DatabaseMeta;
+import com.databasir.core.meta.data.IndexMeta;
+import com.databasir.core.meta.data.TableMeta;
+import com.databasir.dao.tables.pojos.*;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+@Mapper(componentModel = "spring", uses = JsonConverter.class)
+public interface DatabaseMetaConverter {
+
+    default DatabaseMeta of(DatabaseDocumentPojo database,
+                            List<TableDocumentPojo> tables,
+                            List<TableColumnDocumentPojo> columns,
+                            List<TableIndexDocumentPojo> indexes,
+                            List<TableTriggerDocumentPojo> triggers,
+                            List<TableForeignKeyDocumentPojo> foreignKeys) {
+        var columnMap = groupBy(columns, TableColumnDocumentPojo::getTableDocumentId);
+        var indexMap = groupBy(indexes, TableIndexDocumentPojo::getTableDocumentId);
+        var triggerMap = groupBy(triggers, TableTriggerDocumentPojo::getTableDocumentId);
+        var fkMap = groupBy(foreignKeys, TableForeignKeyDocumentPojo::getTableDocumentId);
+        return of(database, tables, columnMap, indexMap, triggerMap, fkMap);
+    }
+
+    default DatabaseMeta of(DatabaseDocumentPojo database,
+                            List<TableDocumentPojo> tables,
+                            Map<Integer, List<TableColumnDocumentPojo>> columnGroupByTableId,
+                            Map<Integer, List<TableIndexDocumentPojo>> indexGroupByTableId,
+                            Map<Integer, List<TableTriggerDocumentPojo>> triggerGroupByTableId,
+                            Map<Integer, List<TableForeignKeyDocumentPojo>> fkGroupByTableId) {
+        List<TableMeta> tableMetas = tables.stream()
+                .map(table -> {
+                    Integer id = table.getId();
+                    var columns = columnGroupByTableId.getOrDefault(id, Collections.emptyList());
+                    var indexes = indexGroupByTableId.getOrDefault(id, Collections.emptyList());
+                    var triggers = triggerGroupByTableId.getOrDefault(id, Collections.emptyList());
+                    var foreignKeys = fkGroupByTableId.getOrDefault(id, Collections.emptyList());
+                    return of(table, columns, indexes, triggers, foreignKeys);
+                })
+                .collect(Collectors.toList());
+        return of(database, tableMetas);
+    }
+
+    DatabaseMeta of(DatabaseDocumentPojo database, List<TableMeta> tables);
+
+    TableMeta of(TableDocumentPojo table,
+                 List<TableColumnDocumentPojo> columns,
+                 List<TableIndexDocumentPojo> indexes,
+                 List<TableTriggerDocumentPojo> triggers,
+                 List<TableForeignKeyDocumentPojo> foreignKeys);
+
+    ColumnMeta of(TableColumnDocumentPojo pojo);
+
+    @Mapping(target = "isUniqueKey", source = "pojo.isUnique")
+    @Mapping(target = "columnNames", source = "pojo.columnNameArray")
+    IndexMeta of(TableIndexDocumentPojo pojo);
+
+    default <R> Map<Integer, List<R>> groupBy(List<R> content, Function<R, Integer> idMapping) {
+        return content.stream()
+                .collect(Collectors.groupingBy(idMapping));
+    }
+}

core/src/main/java/com/databasir/core/domain/document/converter/DocumentPojoConverter.java

@@ -14,7 +14,7 @@ import java.util.List;
 import java.util.stream.Collectors;
 
 @Mapper(componentModel = "spring", uses = JsonConverter.class, unmappedTargetPolicy = ReportingPolicy.WARN)
-public interface DocumentPojoConverter extends BaseConverter {
+public interface DocumentPojoConverter {
 
     @Mapping(target = "databaseName", source = "meta.databaseName")
     @Mapping(target = "schemaName", source = "meta.schemaName")
@@ -23,7 +23,6 @@ public interface DocumentPojoConverter extends BaseConverter {
                                         com.databasir.core.meta.data.DatabaseMeta meta,
                                         Long version);
 
-    @Mapping(target = "comment", qualifiedBy = NullToEmpty.class)
     TableDocumentPojo toTablePojo(Integer databaseDocumentId,
                                   com.databasir.core.meta.data.TableMeta meta);
 
@@ -35,7 +34,6 @@ public interface DocumentPojoConverter extends BaseConverter {
                 .collect(Collectors.toList());
     }
 
-    @Mapping(target = "comment", qualifiedBy = NullToEmpty.class)
     TableColumnDocumentPojo toColumnPojo(Integer databaseDocumentId,
                                          Integer tableDocumentId,
                                          ColumnMeta meta);

core/src/main/java/com/databasir/core/domain/document/converter/NullToEmpty.java

@@ -1,14 +0,0 @@
-package com.databasir.core.domain.document.converter;
-
-import org.mapstruct.Qualifier;
-
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-
-@Qualifier
-@Target(ElementType.METHOD)
-@Retention(RetentionPolicy.CLASS)
-public @interface NullToEmpty {
-}

core/src/main/java/com/databasir/core/domain/document/service/DocumentService.java

@@ -2,7 +2,11 @@ package com.databasir.core.domain.document.service;
 
 import com.databasir.core.Databasir;
 import com.databasir.core.DatabasirConfig;
+import com.databasir.core.diff.Diffs;
+import com.databasir.core.diff.data.DiffType;
+import com.databasir.core.diff.data.RootDiff;
 import com.databasir.core.domain.DomainErrors;
+import com.databasir.core.domain.document.converter.DatabaseMetaConverter;
 import com.databasir.core.domain.document.converter.DocumentPojoConverter;
 import com.databasir.core.domain.document.converter.DocumentResponseConverter;
 import com.databasir.core.domain.document.converter.DocumentSimpleResponseConverter;
@@ -74,6 +78,8 @@ public class DocumentService {
 
     private final DocumentSimpleResponseConverter documentSimpleResponseConverter;
 
+    private final DatabaseMetaConverter databaseMetaConverter;
+
     private final JsonConverter jsonConverter;
 
     private final List<DocumentFileGenerator> documentFileGenerators;
@@ -82,19 +88,37 @@ public class DocumentService {
     public void syncByProjectId(Integer projectId) {
         projectDao.selectOptionalById(projectId)
                 .orElseThrow(DomainErrors.PROJECT_NOT_FOUND::exception);
-        DatabaseMeta meta = retrieveDatabaseMeta(projectId);
+        DatabaseMeta current = retrieveDatabaseMeta(projectId);
-        Optional<DatabaseDocumentPojo> latestDocumentOpt = databaseDocumentDao.selectNotArchivedByProjectId(projectId);
+        Optional<DatabaseDocumentPojo> originalOption = databaseDocumentDao.selectNotArchivedByProjectId(projectId);
-        if (latestDocumentOpt.isPresent()) {
+        if (originalOption.isPresent()) {
-            DatabaseDocumentPojo latestDocument = latestDocumentOpt.get();
+            DatabaseDocumentPojo original = originalOption.get();
-            Integer previousDocumentId = latestDocument.getId();
+            DatabaseMeta originalMeta = retrieveOriginalDatabaseMeta(original);
+            RootDiff diff = Diffs.diff(originalMeta, current);
+            if (diff.getDiffType() == DiffType.NONE) {
+                log.info("ignore project {} {} sync data, because without change",
+                        projectId,
+                        original.getDatabaseName());
+                return;
+            }
+            Integer previousDocumentId = original.getId();
             // archive old version
             databaseDocumentDao.updateIsArchiveById(previousDocumentId, true);
-            saveNewDocument(meta, latestDocument.getVersion() + 1, latestDocument.getProjectId());
+            saveNewDocument(current, original.getVersion() + 1, original.getProjectId());
         } else {
-            saveNewDocument(meta, 1L, projectId);
+            saveNewDocument(current, 1L, projectId);
         }
     }
 
+    private DatabaseMeta retrieveOriginalDatabaseMeta(DatabaseDocumentPojo original) {
+        Integer docId = original.getId();
+        List<TableDocumentPojo> tables = tableDocumentDao.selectByDatabaseDocumentId(docId);
+        List<TableColumnDocumentPojo> columns = tableColumnDocumentDao.selectByDatabaseDocumentId(docId);
+        List<TableIndexDocumentPojo> indexes = tableIndexDocumentDao.selectByDatabaseMetaId(docId);
+        List<TableTriggerDocumentPojo> triggers = tableTriggerDocumentDao.selectByDatabaseDocumentId(docId);
+        List<TableForeignKeyDocumentPojo> fks = tableForeignKeyDocumentDao.selectByDatabaseDocumentId(docId);
+        return databaseMetaConverter.of(original, tables, columns, indexes, triggers, fks);
+    }
+
     private DatabaseMeta retrieveDatabaseMeta(Integer projectId) {
         ProjectSyncRulePojo rule = projectSyncRuleDao.selectByProjectId(projectId);
         DataSourcePojo dataSource = dataSourceDao.selectByProjectId(projectId);
@@ -325,4 +349,20 @@ public class DocumentService {
                             .ifPresent(generator -> generator.generate(context, out));
                 });
     }
+
+    public RootDiff diff(Integer projectId, Long originalVersion, Long currentVersion) {
+        var original = databaseDocumentDao.selectOptionalByProjectIdAndVersion(projectId, originalVersion)
+                .orElseThrow(DomainErrors.DOCUMENT_VERSION_IS_INVALID::exception);
+        DatabaseDocumentPojo current;
+        if (currentVersion == null) {
+            current = databaseDocumentDao.selectNotArchivedByProjectId(projectId)
+                    .orElseThrow(DomainErrors.DOCUMENT_VERSION_IS_INVALID::exception);
+        } else {
+            current = databaseDocumentDao.selectOptionalByProjectIdAndVersion(projectId, currentVersion)
+                    .orElseThrow(DomainErrors.DOCUMENT_VERSION_IS_INVALID::exception);
+        }
+        DatabaseMeta currMeta = retrieveOriginalDatabaseMeta(current);
+        DatabaseMeta originalMeta = retrieveOriginalDatabaseMeta(original);
+        return Diffs.diff(originalMeta, currMeta);
+    }
 }

dao/generated-src/jooq/main/java/com/databasir/dao/tables/TableColumnDocument.java

@@ -81,7 +81,7 @@ public class TableColumnDocument extends TableImpl<TableColumnDocumentRecord> {
     /**
      * The column <code>databasir.table_column_document.comment</code>.
      */
-    public final TableField<TableColumnDocumentRecord, String> COMMENT = createField(DSL.name("comment"), SQLDataType.VARCHAR(512).nullable(false), this, "");
+    public final TableField<TableColumnDocumentRecord, String> COMMENT = createField(DSL.name("comment"), SQLDataType.VARCHAR(512), this, "");
 
     /**
      * The column <code>databasir.table_column_document.default_value</code>.

dao/generated-src/jooq/main/java/com/databasir/dao/tables/TableDocument.java

@@ -69,12 +69,12 @@ public class TableDocument extends TableImpl<TableDocumentRecord> {
     /**
      * The column <code>databasir.table_document.type</code>.
      */
-    public final TableField<TableDocumentRecord, String> TYPE = createField(DSL.name("type"), SQLDataType.CLOB.nullable(false), this, "");
+    public final TableField<TableDocumentRecord, String> TYPE = createField(DSL.name("type"), SQLDataType.VARCHAR(255).nullable(false), this, "");
 
     /**
      * The column <code>databasir.table_document.comment</code>.
      */
-    public final TableField<TableDocumentRecord, String> COMMENT = createField(DSL.name("comment"), SQLDataType.CLOB.nullable(false), this, "");
+    public final TableField<TableDocumentRecord, String> COMMENT = createField(DSL.name("comment"), SQLDataType.VARCHAR(512), this, "");
 
     /**
      * The column <code>databasir.table_document.create_at</code>.

dao/generated-src/jooq/main/java/com/databasir/dao/tables/TableForeignKeyDocument.java

@@ -19,7 +19,7 @@ import org.jooq.Identity;
 import org.jooq.Index;
 import org.jooq.Name;
 import org.jooq.Record;
-import org.jooq.Row12;
+import org.jooq.Row13;
 import org.jooq.Schema;
 import org.jooq.Table;
 import org.jooq.TableField;
@@ -69,6 +69,11 @@ public class TableForeignKeyDocument extends TableImpl<TableForeignKeyDocumentRe
      */
     public final TableField<TableForeignKeyDocumentRecord, Integer> DATABASE_DOCUMENT_ID = createField(DSL.name("database_document_id"), SQLDataType.INTEGER.nullable(false), this, "");
 
+    /**
+     * The column <code>databasir.table_foreign_key_document.key_seq</code>.
+     */
+    public final TableField<TableForeignKeyDocumentRecord, Integer> KEY_SEQ = createField(DSL.name("key_seq"), SQLDataType.INTEGER.nullable(false).defaultValue(DSL.inline("0", SQLDataType.INTEGER)), this, "");
+
     /**
      * The column <code>databasir.table_foreign_key_document.fk_name</code>.
      */
@@ -203,11 +208,11 @@ public class TableForeignKeyDocument extends TableImpl<TableForeignKeyDocumentRe
     }
 
     // -------------------------------------------------------------------------
-    // Row12 type methods
+    // Row13 type methods
     // -------------------------------------------------------------------------
 
     @Override
-    public Row12<Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> fieldsRow() {
+    public Row13<Integer, Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> fieldsRow() {
-        return (Row12) super.fieldsRow();
+        return (Row13) super.fieldsRow();
     }
 }

dao/generated-src/jooq/main/java/com/databasir/dao/tables/pojos/TableForeignKeyDocumentPojo.java

@@ -19,6 +19,7 @@ public class TableForeignKeyDocumentPojo implements Serializable {
     private Integer       id;
     private Integer       tableDocumentId;
     private Integer       databaseDocumentId;
+    private Integer       keySeq;
     private String        fkName;
     private String        fkTableName;
     private String        fkColumnName;
@@ -35,6 +36,7 @@ public class TableForeignKeyDocumentPojo implements Serializable {
         this.id = value.id;
         this.tableDocumentId = value.tableDocumentId;
         this.databaseDocumentId = value.databaseDocumentId;
+        this.keySeq = value.keySeq;
         this.fkName = value.fkName;
         this.fkTableName = value.fkTableName;
         this.fkColumnName = value.fkColumnName;
@@ -50,6 +52,7 @@ public class TableForeignKeyDocumentPojo implements Serializable {
         Integer       id,
         Integer       tableDocumentId,
         Integer       databaseDocumentId,
+        Integer       keySeq,
         String        fkName,
         String        fkTableName,
         String        fkColumnName,
@@ -63,6 +66,7 @@ public class TableForeignKeyDocumentPojo implements Serializable {
         this.id = id;
         this.tableDocumentId = tableDocumentId;
         this.databaseDocumentId = databaseDocumentId;
+        this.keySeq = keySeq;
         this.fkName = fkName;
         this.fkTableName = fkTableName;
         this.fkColumnName = fkColumnName;
@@ -120,6 +124,20 @@ public class TableForeignKeyDocumentPojo implements Serializable {
         this.databaseDocumentId = databaseDocumentId;
     }
 
+    /**
+     * Getter for <code>databasir.table_foreign_key_document.key_seq</code>.
+     */
+    public Integer getKeySeq() {
+        return this.keySeq;
+    }
+
+    /**
+     * Setter for <code>databasir.table_foreign_key_document.key_seq</code>.
+     */
+    public void setKeySeq(Integer keySeq) {
+        this.keySeq = keySeq;
+    }
+
     /**
      * Getter for <code>databasir.table_foreign_key_document.fk_name</code>.
      */
@@ -265,6 +283,7 @@ public class TableForeignKeyDocumentPojo implements Serializable {
         sb.append(id);
         sb.append(", ").append(tableDocumentId);
         sb.append(", ").append(databaseDocumentId);
+        sb.append(", ").append(keySeq);
         sb.append(", ").append(fkName);
         sb.append(", ").append(fkTableName);
         sb.append(", ").append(fkColumnName);

dao/generated-src/jooq/main/java/com/databasir/dao/tables/records/TableForeignKeyDocumentRecord.java

@@ -11,8 +11,8 @@ import java.time.LocalDateTime;
 
 import org.jooq.Field;
 import org.jooq.Record1;
-import org.jooq.Record12;
+import org.jooq.Record13;
-import org.jooq.Row12;
+import org.jooq.Row13;
 import org.jooq.impl.UpdatableRecordImpl;
 
 
@@ -20,7 +20,7 @@ import org.jooq.impl.UpdatableRecordImpl;
  * This class is generated by jOOQ.
  */
 @SuppressWarnings({ "all", "unchecked", "rawtypes" })
-public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableForeignKeyDocumentRecord> implements Record12<Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> {
+public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableForeignKeyDocumentRecord> implements Record13<Integer, Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> {
 
     private static final long serialVersionUID = 1L;
 
@@ -70,18 +70,32 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
         return (Integer) get(2);
     }
 
+    /**
+     * Setter for <code>databasir.table_foreign_key_document.key_seq</code>.
+     */
+    public void setKeySeq(Integer value) {
+        set(3, value);
+    }
+
+    /**
+     * Getter for <code>databasir.table_foreign_key_document.key_seq</code>.
+     */
+    public Integer getKeySeq() {
+        return (Integer) get(3);
+    }
+
     /**
      * Setter for <code>databasir.table_foreign_key_document.fk_name</code>.
      */
     public void setFkName(String value) {
-        set(3, value);
+        set(4, value);
     }
 
     /**
      * Getter for <code>databasir.table_foreign_key_document.fk_name</code>.
      */
     public String getFkName() {
-        return (String) get(3);
+        return (String) get(4);
     }
 
     /**
@@ -89,7 +103,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.fk_table_name</code>.
      */
     public void setFkTableName(String value) {
-        set(4, value);
+        set(5, value);
     }
 
     /**
@@ -97,7 +111,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.fk_table_name</code>.
      */
     public String getFkTableName() {
-        return (String) get(4);
+        return (String) get(5);
     }
 
     /**
@@ -105,7 +119,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.fk_column_name</code>.
      */
     public void setFkColumnName(String value) {
-        set(5, value);
+        set(6, value);
     }
 
     /**
@@ -113,21 +127,21 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.fk_column_name</code>.
      */
     public String getFkColumnName() {
-        return (String) get(5);
+        return (String) get(6);
     }
 
     /**
      * Setter for <code>databasir.table_foreign_key_document.pk_name</code>.
      */
     public void setPkName(String value) {
-        set(6, value);
+        set(7, value);
     }
 
     /**
      * Getter for <code>databasir.table_foreign_key_document.pk_name</code>.
      */
     public String getPkName() {
-        return (String) get(6);
+        return (String) get(7);
     }
 
     /**
@@ -135,7 +149,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.pk_table_name</code>.
      */
     public void setPkTableName(String value) {
-        set(7, value);
+        set(8, value);
     }
 
     /**
@@ -143,7 +157,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.pk_table_name</code>.
      */
     public String getPkTableName() {
-        return (String) get(7);
+        return (String) get(8);
     }
 
     /**
@@ -151,7 +165,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.pk_column_name</code>.
      */
     public void setPkColumnName(String value) {
-        set(8, value);
+        set(9, value);
     }
 
     /**
@@ -159,7 +173,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * <code>databasir.table_foreign_key_document.pk_column_name</code>.
      */
     public String getPkColumnName() {
-        return (String) get(8);
+        return (String) get(9);
     }
 
     /**
@@ -167,7 +181,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * NO_ACTION, CASCADE, SET_NULL, SET_DEFAULT
      */
     public void setUpdateRule(String value) {
-        set(9, value);
+        set(10, value);
     }
 
     /**
@@ -175,7 +189,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * NO_ACTION, CASCADE, SET_NULL, SET_DEFAULT
      */
     public String getUpdateRule() {
-        return (String) get(9);
+        return (String) get(10);
     }
 
     /**
@@ -183,7 +197,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * NO_ACTION, CASCADE, SET_NULL, SET_DEFAULT
      */
     public void setDeleteRule(String value) {
-        set(10, value);
+        set(11, value);
     }
 
     /**
@@ -191,21 +205,21 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
      * NO_ACTION, CASCADE, SET_NULL, SET_DEFAULT
      */
     public String getDeleteRule() {
-        return (String) get(10);
+        return (String) get(11);
     }
 
     /**
      * Setter for <code>databasir.table_foreign_key_document.create_at</code>.
      */
     public void setCreateAt(LocalDateTime value) {
-        set(11, value);
+        set(12, value);
     }
 
     /**
      * Getter for <code>databasir.table_foreign_key_document.create_at</code>.
      */
     public LocalDateTime getCreateAt() {
-        return (LocalDateTime) get(11);
+        return (LocalDateTime) get(12);
     }
 
     // -------------------------------------------------------------------------
@@ -218,17 +232,17 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
     }
 
     // -------------------------------------------------------------------------
-    // Record12 type implementation
+    // Record13 type implementation
     // -------------------------------------------------------------------------
 
     @Override
-    public Row12<Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> fieldsRow() {
+    public Row13<Integer, Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> fieldsRow() {
-        return (Row12) super.fieldsRow();
+        return (Row13) super.fieldsRow();
     }
 
     @Override
-    public Row12<Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> valuesRow() {
+    public Row13<Integer, Integer, Integer, Integer, String, String, String, String, String, String, String, String, LocalDateTime> valuesRow() {
-        return (Row12) super.valuesRow();
+        return (Row13) super.valuesRow();
     }
 
     @Override
@@ -247,47 +261,52 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
     }
 
     @Override
-    public Field<String> field4() {
+    public Field<Integer> field4() {
-        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.FK_NAME;
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.KEY_SEQ;
     }
 
     @Override
     public Field<String> field5() {
-        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.FK_TABLE_NAME;
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.FK_NAME;
     }
 
     @Override
     public Field<String> field6() {
-        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.FK_COLUMN_NAME;
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.FK_TABLE_NAME;
     }
 
     @Override
     public Field<String> field7() {
-        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.PK_NAME;
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.FK_COLUMN_NAME;
     }
 
     @Override
     public Field<String> field8() {
-        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.PK_TABLE_NAME;
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.PK_NAME;
     }
 
     @Override
     public Field<String> field9() {
-        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.PK_COLUMN_NAME;
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.PK_TABLE_NAME;
     }
 
     @Override
     public Field<String> field10() {
-        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.UPDATE_RULE;
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.PK_COLUMN_NAME;
     }
 
     @Override
     public Field<String> field11() {
+        return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.UPDATE_RULE;
+    }
+
+    @Override
+    public Field<String> field12() {
         return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.DELETE_RULE;
     }
 
     @Override
-    public Field<LocalDateTime> field12() {
+    public Field<LocalDateTime> field13() {
         return TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT.CREATE_AT;
     }
 
@@ -307,47 +326,52 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
     }
 
     @Override
-    public String component4() {
+    public Integer component4() {
-        return getFkName();
+        return getKeySeq();
     }
 
     @Override
     public String component5() {
-        return getFkTableName();
+        return getFkName();
     }
 
     @Override
     public String component6() {
-        return getFkColumnName();
+        return getFkTableName();
     }
 
     @Override
     public String component7() {
-        return getPkName();
+        return getFkColumnName();
     }
 
     @Override
     public String component8() {
-        return getPkTableName();
+        return getPkName();
     }
 
     @Override
     public String component9() {
-        return getPkColumnName();
+        return getPkTableName();
     }
 
     @Override
     public String component10() {
-        return getUpdateRule();
+        return getPkColumnName();
     }
 
     @Override
     public String component11() {
+        return getUpdateRule();
+    }
+
+    @Override
+    public String component12() {
         return getDeleteRule();
     }
 
     @Override
-    public LocalDateTime component12() {
+    public LocalDateTime component13() {
         return getCreateAt();
     }
 
@@ -367,47 +391,52 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
     }
 
     @Override
-    public String value4() {
+    public Integer value4() {
-        return getFkName();
+        return getKeySeq();
     }
 
     @Override
     public String value5() {
-        return getFkTableName();
+        return getFkName();
     }
 
     @Override
     public String value6() {
-        return getFkColumnName();
+        return getFkTableName();
     }
 
     @Override
     public String value7() {
-        return getPkName();
+        return getFkColumnName();
     }
 
     @Override
     public String value8() {
-        return getPkTableName();
+        return getPkName();
     }
 
     @Override
     public String value9() {
-        return getPkColumnName();
+        return getPkTableName();
     }
 
     @Override
     public String value10() {
-        return getUpdateRule();
+        return getPkColumnName();
     }
 
     @Override
     public String value11() {
+        return getUpdateRule();
+    }
+
+    @Override
+    public String value12() {
         return getDeleteRule();
     }
 
     @Override
-    public LocalDateTime value12() {
+    public LocalDateTime value13() {
         return getCreateAt();
     }
 
@@ -430,61 +459,67 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
     }
 
     @Override
-    public TableForeignKeyDocumentRecord value4(String value) {
+    public TableForeignKeyDocumentRecord value4(Integer value) {
-        setFkName(value);
+        setKeySeq(value);
         return this;
     }
 
     @Override
     public TableForeignKeyDocumentRecord value5(String value) {
-        setFkTableName(value);
+        setFkName(value);
         return this;
     }
 
     @Override
     public TableForeignKeyDocumentRecord value6(String value) {
-        setFkColumnName(value);
+        setFkTableName(value);
         return this;
     }
 
     @Override
     public TableForeignKeyDocumentRecord value7(String value) {
-        setPkName(value);
+        setFkColumnName(value);
         return this;
     }
 
     @Override
     public TableForeignKeyDocumentRecord value8(String value) {
-        setPkTableName(value);
+        setPkName(value);
         return this;
     }
 
     @Override
     public TableForeignKeyDocumentRecord value9(String value) {
-        setPkColumnName(value);
+        setPkTableName(value);
         return this;
     }
 
     @Override
     public TableForeignKeyDocumentRecord value10(String value) {
-        setUpdateRule(value);
+        setPkColumnName(value);
         return this;
     }
 
     @Override
     public TableForeignKeyDocumentRecord value11(String value) {
+        setUpdateRule(value);
+        return this;
+    }
+
+    @Override
+    public TableForeignKeyDocumentRecord value12(String value) {
         setDeleteRule(value);
         return this;
     }
 
     @Override
-    public TableForeignKeyDocumentRecord value12(LocalDateTime value) {
+    public TableForeignKeyDocumentRecord value13(LocalDateTime value) {
         setCreateAt(value);
         return this;
     }
 
     @Override
-    public TableForeignKeyDocumentRecord values(Integer value1, Integer value2, Integer value3, String value4, String value5, String value6, String value7, String value8, String value9, String value10, String value11, LocalDateTime value12) {
+    public TableForeignKeyDocumentRecord values(Integer value1, Integer value2, Integer value3, Integer value4, String value5, String value6, String value7, String value8, String value9, String value10, String value11, String value12, LocalDateTime value13) {
         value1(value1);
         value2(value2);
         value3(value3);
@@ -497,6 +532,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
         value10(value10);
         value11(value11);
         value12(value12);
+        value13(value13);
         return this;
     }
 
@@ -514,12 +550,13 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
     /**
      * Create a detached, initialised TableForeignKeyDocumentRecord
      */
-    public TableForeignKeyDocumentRecord(Integer id, Integer tableDocumentId, Integer databaseDocumentId, String fkName, String fkTableName, String fkColumnName, String pkName, String pkTableName, String pkColumnName, String updateRule, String deleteRule, LocalDateTime createAt) {
+    public TableForeignKeyDocumentRecord(Integer id, Integer tableDocumentId, Integer databaseDocumentId, Integer keySeq, String fkName, String fkTableName, String fkColumnName, String pkName, String pkTableName, String pkColumnName, String updateRule, String deleteRule, LocalDateTime createAt) {
         super(TableForeignKeyDocument.TABLE_FOREIGN_KEY_DOCUMENT);
 
         setId(id);
         setTableDocumentId(tableDocumentId);
         setDatabaseDocumentId(databaseDocumentId);
+        setKeySeq(keySeq);
         setFkName(fkName);
         setFkTableName(fkTableName);
         setFkColumnName(fkColumnName);
@@ -541,6 +578,7 @@ public class TableForeignKeyDocumentRecord extends UpdatableRecordImpl<TableFore
             setId(value.getId());
             setTableDocumentId(value.getTableDocumentId());
             setDatabaseDocumentId(value.getDatabaseDocumentId());
+            setKeySeq(value.getKeySeq());
             setFkName(value.getFkName());
             setFkTableName(value.getFkTableName());
             setFkColumnName(value.getFkColumnName());

dao/src/main/resources/db/migration/V1__init.sql

@@ -136,11 +136,11 @@ CREATE TABLE IF NOT EXISTS table_document
 (
 
     id                   INT PRIMARY KEY AUTO_INCREMENT,
-    database_document_id INT       NOT NULL,
+    database_document_id INT          NOT NULL,
-    name                 TEXT      NOT NULL,
+    name                 TEXT         NOT NULL,
-    type                 TEXT      NOT NULL,
+    type                 VARCHAR(255) NOT NULL,
-    comment              TEXT      NOT NULL,
+    comment              VARCHAR(512)          DEFAULT NULL,
-    create_at            TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    create_at            TIMESTAMP    NOT NULL DEFAULT CURRENT_TIMESTAMP,
     INDEX idx_database_document_id (database_document_id)
 ) CHARSET utf8mb4
   COLLATE utf8mb4_unicode_ci;
@@ -153,7 +153,7 @@ CREATE TABLE IF NOT EXISTS table_column_document
     database_document_id INT          NOT NULL,
     name                 TEXT         NOT NULL,
     type                 VARCHAR(255) NOT NULL,
-    comment              VARCHAR(512) NOT NULL,
+    comment              VARCHAR(512)          DEFAULT NULL,
     default_value        VARCHAR(512)          DEFAULT NULL,
     size                 INT          NOT NULL,
     decimal_digits       INT                   DEFAULT NULL,
@@ -171,6 +171,7 @@ CREATE TABLE IF NOT EXISTS table_foreign_key_document
     id                   INT PRIMARY KEY AUTO_INCREMENT,
     table_document_id    INT          NOT NULL,
     database_document_id INT          NOT NULL,
+    key_seq              INT          NOT NULL DEFAULT 0,
     fk_name              VARCHAR(255)          DEFAULT NULL,
     fk_table_name        VARCHAR(512) NOT NULL,
     fk_column_name       VARCHAR(512) NOT NULL,

plugin/build.gradle

@@ -2,4 +2,6 @@ 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}"
 }

plugin/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);
+    }
+
+}

plugin/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();
+
+}

plugin/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;
+    }
+}

plugin/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<>();
+
+}

plugin/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<>();
+
+}

plugin/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);
+    }
+}

plugin/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;
+    }
+}

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

@@ -0,0 +1,94 @@
+package com.databasir.core.diff.processor;
+
+import com.databasir.core.diff.data.DiffType;
+import com.databasir.core.diff.data.FieldDiff;
+
+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> {
+
+    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()));
+    }
+
+    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;
+    }
+}

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

@@ -0,0 +1,24 @@
+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 -> {
+                    if (fk.getFkName() == null) {
+                        return fk.getFkTableName() + "." + fk.getFkColumnName() + "." + fk.getKeySeq();
+                    } else {
+                        return fk.getFkName();
+                    }
+                });
+    }
+}

plugin/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);
+    }
+}

plugin/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;
+    }
+}

plugin/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);
+    }
+}

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

@@ -1,10 +1,14 @@
 package com.databasir.core.meta.data;
 
+import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
-@Data
 @Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
 public class ColumnMeta {
 
     private String name;

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

@@ -1,12 +1,16 @@
 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 {
 

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

@@ -1,12 +1,18 @@
 package com.databasir.core.meta.data;
 
+import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
-@Data
 @Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
 public class ForeignKeyMeta {
 
+    private Integer keySeq;
+
     /**
      * may null
      */

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

@@ -1,13 +1,17 @@
 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
 @Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
 public class IndexMeta {
 
     private String name;

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

@@ -1,13 +1,17 @@
 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
 @Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
 public class TableMeta {
 
     private String name;
@@ -27,6 +31,4 @@ public class TableMeta {
 
     @Builder.Default
     private List<ForeignKeyMeta> foreignKeys = Collections.emptyList();
-
-    private String remark;
 }

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

@@ -1,13 +1,17 @@
 package com.databasir.core.meta.data;
 
+import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
 /**
  * now: only support mysql, postgresql.
  */
-@Data
 @Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
 public class TriggerMeta {
 
     private String name;

plugin/src/main/java/com/databasir/core/meta/repository/impl/jdbc/JdbcForeignKeyMetaRepository.java

@@ -41,8 +41,10 @@ public class JdbcForeignKeyMetaRepository implements ForeignKeyMetaRepository {
                 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)

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

@@ -51,7 +51,7 @@ public class MarkdownRender implements Render {
 
     private void buildTableName(MarkdownBuilder contentBuilder, TableMeta table) {
         String tableName;
-        if (table.getComment() == null || table.getComment().trim().isEmpty()) {
+        if (table.getComment().isEmpty()) {
             tableName = table.getName();
         } else {
             tableName = table.getName() + "(" + table.getComment() + ")";

plugin/src/test/java/App.java

@@ -1,40 +0,0 @@
-import com.databasir.core.Databasir;
-import com.databasir.core.meta.data.DatabaseMeta;
-import org.junit.jupiter.api.Test;
-
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.SQLException;
-import java.util.Properties;
-
-public class App {
-
-    @Test
-    public void testRenderAsMarkdown() throws SQLException, ClassNotFoundException {
-        try (FileOutputStream out = new FileOutputStream("demo.md")) {
-            Connection connection = getJdbcConnection();
-            Databasir databasir = Databasir.of();
-            DatabaseMeta doc = databasir.get(connection, "demo").orElseThrow();
-            databasir.renderAsMarkdown(doc, out);
-        } catch (IOException e) {
-            throw new IllegalStateException(e);
-        }
-    }
-
-    private static Connection getJdbcConnection() throws SQLException, ClassNotFoundException {
-        // get database connection
-        Class.forName("com.mysql.cj.jdbc.Driver");
-
-        Properties info = new Properties();
-        info.put("user", "root");
-        info.put("password", "123456");
-        // this config is used by mysql
-        info.put("useInformationSchema", "true");
-
-        String url = "jdbc:mysql://localhost:3306/demo?"
-                + "useUnicode=true&characterEncoding=UTF-8&useSSL=false&allowPublicKeyRetrieval=true";
-        return DriverManager.getConnection(url, info);
-    }
-}

plugin/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);
+        }
+    }
+}

plugin/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": []
+    }
+  ]
+}

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

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

plugin/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": []
+    }
+  ]
+}

plugin/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": []
+    }
+  ]
+}

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

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

plugin/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": []
+    }
+  ]
+}

plugin/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": []
+    }
+  ]
+}