enhance: Save operation support for contrib/drivers/dm

[oldme-git]

Dear reviewer:
优化了 dm 数据库的 save 方法，换成了和 Oracle 一套的逻辑。

[cf-devil-cry]

dameng Save where table has a AUTO_INCREMENT key Id. when save a new Record， it not work .
ex： MERGE INTO forecast_config T1 USING (SELECT 100 AS RATIO,'coeason' AS REASON FROM DUAL) T2 ON (T1.id = T2.id) WHEN NOT MATCHED THEN INSERT(RATIO,REASON) VALUES (T2.RATIO,T2.REASON) WHEN MATCHED THEN UPDATE SET T1.RATIO = T2.RATIO,T1.REASON = T2.REASON; 无法解析的成员访问表达式[T2.ID]