mysql 触发器更新自己表|单表操作 阿星小栈

#更新表`m_order`的status_id，
#注意要用BEFORE
#SQL语句不能用UPDATE，要用SET
CREATE TRIGGER `tg_order2order_update` BEFORE UPDATE ON `m_order` FOR EACH ROW BEGIN
    set new.`status_id` = (SELECT `status_id`  FROM m_status WHERE `id` =  new.`order_id`) ;
END;

常会报错如：

updating of new row is not allowed in after trigger

Can’t update table ‘dept’ in stored function/trigger because it is already used by statement which invoked this stored function/trigger.

转自：http://blog.csdn.net/webnoties/article/details/47728363