feat(db): 添加对达梦数据库的支持

- 在应用程序中新增对达梦数据库（DM）的配置和连接支持
- 实现 SetDmDB 函数以配置达梦数据库连接
- 更新数据库操作逻辑，支持达梦特有的 SQL 语法和功能
- 在相关文件中添加达梦数据库的处理逻辑，包括表创建、数据插入和查询
- 更新 go.mod 和 go.sum 文件以引入达梦数据库驱动
- 增强文档，详细说明达梦数据库的配置和使用方法

code/makecode.go

@@ -118,6 +118,9 @@ func (that *MakeCode) Db2JSON(db *db.HoTimeDB, config Map) {
 	if db.Type == "sqlite" {
 		nowTables = db.Select("sqlite_master", "name", Map{"type": "table"})
 	}
+	if db.Type == "dm" || db.Type == "dameng" {
+		nowTables = db.Query(`SELECT TABLE_NAME AS "name", COMMENTS AS "label" FROM USER_TAB_COMMENTS WHERE TABLE_TYPE='TABLE'`)
+	}
 	//idSlice=append(idSlice,nowTables)
 	for _, v := range nowTables {
 		// if v.GetString("name") == "cached" {
@@ -163,6 +166,9 @@ func (that *MakeCode) Db2JSON(db *db.HoTimeDB, config Map) {
 		if db.Type == "sqlite" {
 			tableInfo = db.Query("pragma table_info([" + v.GetString("name") + "]);")
 		}
+		if db.Type == "dm" || db.Type == "dameng" {
+			tableInfo = db.Query(`SELECT c.COLUMN_NAME AS "name", c.DATA_TYPE AS "type", m.COMMENTS AS "label", c.NULLABLE AS "must", c.DATA_DEFAULT AS "dflt_value" FROM USER_TAB_COLUMNS c LEFT JOIN USER_COL_COMMENTS m ON c.TABLE_NAME=m.TABLE_NAME AND c.COLUMN_NAME=m.COLUMN_NAME WHERE c.TABLE_NAME='` + v.GetString("name") + `' ORDER BY c.COLUMN_ID`)
+		}
 
 		idSlice = append(idSlice, tableInfo)
 		for _, info1 := range tableInfo {