!126 feat: 解析达梦特殊字段

* feat: 解析达梦特殊字段

server/internal/db/dbm/postgres/helper.go

@@ -73,8 +73,14 @@ var (
 		dbi.CommonTypeEnum:       "varchar(2000)",
 		dbi.CommonTypeJSON:       "varchar(2000)",
 	}
+	dataHelper   = &DataHelper{}
+	columnHelper = &ColumnHelper{}
 )
 
+func GetDataHelper() *DataHelper {
+	return dataHelper
+}
+
 type DataHelper struct {
 }