!123 一些bug修复

* fix: 数据同步、数据迁移体验优化
* fix: des加密传输sql
* fix: 修复达梦字段注释显示问题
* fix: mysql timestamp 字段类型导出ddl错误修复

server/internal/db/dbm/dbi/metasql/dm_meta.sql

@@ -60,15 +60,15 @@ select a.owner,
        a.char_col_decl_length                                                              as CHAR_MAX_LENGTH,
        a.data_precision                                                                    as NUM_PRECISION,
        a.data_scale                                                                        as NUM_SCALE,
-       b.comments                                                                          as COLUMN_COMMENT,
+       b.COMMENT$                                                                          as COLUMN_COMMENT,
        a.data_default                                                                      as COLUMN_DEFAULT,
        case when t.INFO2 & 0x01 = 0x01 then 1 else 0 end                                   as IS_IDENTITY,
        case when t2.constraint_type = 'P' then 1 else 0 end                                as IS_PRIMARY_KEY
 from all_tab_columns a
-         left join all_col_comments b
-                   on b.owner = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
-                       and b.table_name = a.table_name
-                       and a.column_name = b.column_name
+         left join SYSCOLUMNCOMMENTS b
+                   on b.SCHNAME = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
+                       and b.TVNAME = a.table_name
+                       and a.column_name = b.COLNAME
          left join (select c1.*, c2.object_name, c2.owner
                     FROM SYS.SYSCOLUMNS c1
                              join SYS.all_objects c2 on c1.id = c2.object_id and c2.object_type = 'TABLE') t