本文實例講述了mysql 觸發(fā)器語法與應(yīng)用。分享給大家供大家參考，具體如下：

例子：創(chuàng)建觸發(fā)器，記錄表的增、刪、改操作記錄

//創(chuàng)建user表；DROP TABLE IF EXISTS `user`;CREATE TABLE `user` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `account` varchar(255) DEFAULT NULL, `name` varchar(255) DEFAULT NULL, `address` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8; //創(chuàng)建對user表操作歷史表DROP TABLE IF EXISTS `user_history`;CREATE TABLE `user_history` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `user_id` bigint(20) NOT NULL, `operatetype` varchar(200) NOT NULL, `operatetime` datetime NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;

DELIMITER：改變輸入的結(jié)束符，默認(rèn)情況下輸入結(jié)束符是分號;，這里把它改成了兩個分號;;，這樣做的目的是把多條含分號的語句做個封裝，全部輸入完之后一起執(zhí)行，而不是一遇到默認(rèn)的分號結(jié)束符就自動執(zhí)行；

INSERT:

DROP TRIGGER IF EXISTS `tri_insert_user`;DELIMITER ;;CREATE TRIGGER `tri_insert_user` AFTER INSERT ON `user` FOR EACH ROW begin INSERT INTO user_history(user_id, operatetype, operatetime) VALUES (new.id, ’add a user’, now());end;;DELIMITER ;

UPDATE:

DROP TRIGGER IF EXISTS `tri_update_user`;DELIMITER ;;CREATE TRIGGER `tri_update_user` AFTER UPDATE ON `user` FOR EACH ROW begin INSERT INTO user_history(user_id,operatetype, operatetime) VALUES (new.id, ’update a user’, now());end;;DELIMITER ;

DELETE:

DROP TRIGGER IF EXISTS `tri_delete_user`;DELIMITER ;;CREATE TRIGGER `tri_delete_user` AFTER DELETE ON `user` FOR EACH ROW begin INSERT INTO user_history(user_id, operatetype, operatetime) VALUES (old.id, ’delete a user’, now());end;;DELIMITER ;

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希望本文所述對大家MySQL數(shù)據(jù)庫計有所幫助。