MySQL 触发器：在删除之前在日志中插入 table

Question

这是我第一次 post 来这里！ =]

我正在创建一个触发器以在每次有人试图从 table

中删除某些内容时插入日志 table

CREATE DEFINER=`root`@`localhost` TRIGGER `user_before_delete`      
BEFORE DELETE ON `user` FOR EACH ROW BEGIN

INSERT INTO log_alert(id, table_id, name)
VALUES('99002', OLD.id, OLD.name);

SIGNAL SQLSTATE '99002'
SET MESSAGE_TEXT = 'TRYING TO REMOVE A USER!'
END

但问题是： SIGNAL SQLSTATE 回滚整个操作！那么，如何在日志 TABLE 上插入并防止删除用户？

Answer 1

在使用 BEGIN/END 块之前，将分隔符更改为 $$，然后切换回：

DELIMITER $$

CREATE DEFINER=`root`@`localhost` TRIGGER `user_before_delete`      
BEFORE DELETE ON `user` FOR EACH ROW BEGIN

INSERT INTO log_alert(id, table_id, name)
VALUES('99002', OLD.id, OLD.name);

SIGNAL SQLSTATE '99002'
SET MESSAGE_TEXT = 'TRYING TO REMOVE A USER!';

END $$

DELIMITER ;

试试吧!!!

Answer 2

Marc B 解决方法对我有用 =]

quick/dirty workaround: change log_alert to be a myisam table. no transactions there, so no way to roll back your insert. –  Marc B 15 hours ago

只需将 log_alert 更改为 MyISAM 类型，INSERTS 将不再回滚

MySQL 触发器：在删除之前在日志中插入 table

MySQL Triggers: INSERT ON log BEFORE DELETE ON table

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