优化ddl解析

dbsyncer-parser/src/main/java/org/dbsyncer/parser/ddl/alter/AddStrategy.java

@@ -10,7 +10,12 @@ import org.dbsyncer.sdk.config.DDLConfig;
 import org.dbsyncer.sdk.enums.DDLOperationEnum;
 
 /**
- * 解析add的属性 exampleSql: ALTER TABLE cost ADD duan INT after(before) `tmp`;
+ * 新增字段
+ * <code>
+ *     ALTER TABLE `test`.`test_user`
+ * ADD COLUMN `aaa` varchar(255) NULL AFTER `create_date`,
+ * ADD COLUMN `bbb` varchar(255) NULL AFTER `aaa`
+ * </code>
  *
  * @author life
  */

dbsyncer-parser/src/main/java/org/dbsyncer/parser/ddl/alter/ChangeStrategy.java

@@ -11,7 +11,11 @@ import org.dbsyncer.sdk.enums.DDLOperationEnum;
 
 /**
  * 解析change属性
- * exampleSql: ALTER TABLE test_table CHANGE duan1  duan2 INT(10)
+ * <code>
+ *     ALTER TABLE `test`.`test_user`
+ * CHANGE COLUMN `name` `name2` varchar(200) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL AFTER `id`,
+ * CHANGE COLUMN `remark` `remark2` varchar(200) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL AFTER `name2`
+ * </code>
  *
  * @author life
  */

dbsyncer-parser/src/main/java/org/dbsyncer/parser/ddl/alter/DropStrategy.java

@@ -11,6 +11,11 @@ import org.dbsyncer.sdk.enums.DDLOperationEnum;
 
 /**
  * 解析drop
+ * <code>
+ *     ALTER TABLE `test`.`test_user`
+ * DROP COLUMN `aaa`,
+ * DROP COLUMN `bbb`
+ * </code>
  *
  * @author life
  */