SQL触发器与SQLite触发器的区别- 唔愛吃蘋果- 博客园企业库|免费b2b网站

代码

::----------SQL触发器-------------------------------------------------
1.删除
    CREATE TRIGGER [Delete_TopAlexa] ON [dbo].[tb_WebSite]
    FOR DELETE
    AS
    BEGIN TRANSACTION
        delete from tb_alexa where websiteid=(select websiteid from deleted)
        delete from tb_top100 where websiteid=(select websiteid from deleted)
        IF (@@ERROR <> 0) -- 如果有错误
        BEGIN
            ROLLBACK TRANSACTION -- 回滚
        END
    COMMIT TRANSACTION -- 提交事务
2.更新
    create trigger Test_OK
    on ok
    for update
    as
    if update(name)
    begin
        update sname set sname.s_name=ok.name from ok,sname
        where sname.n_id=ok.n_id
    end

::----------SQLite触发器-------------------------------------------------
1.删除
    Create  Trigger MAIN.[UserOK_DeleteOK] AFTER DELETE On [UserOK] FOR EACH ROW
    begin
        delete from userbak where uid=old.uid ;
    end;

2.更新
    Create  Trigger MAIN.[UserOK_Update] AFTER UPDATE On [UserOK] FOR EACH ROW
    begin
        update userbak set username=new.username
        where userbak.uid=old.uid ;
    end;

以上UPDATE() 函数可用于确定 INSERT 或 UPDATE 语句是否影响表中的特定列。无论何时为列赋值，该函数都将返回 TRUE。

此外，COLUMNS_UPDATED 函数也可用于检查 INSERT 或 UPDATE 语句更新了表中的哪些列。此函数使用整数位掩码指定要测试的列。有关详细信息，请参阅 CREATE TRIGGER。