mysql触发器实例_MySQL

测试表1

DROP TABLE IF EXISTS test;                  CREATE TABLE test (    id           bigint(11) unsigned NOT NULL AUTO_INCREMENT,    name         varchar(100) NOT NULL DEFAULT '',    type         varchar(100),  create_time  datetime,    PRIMARY KEY (ID)  ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;  

测试表2

DROP TABLE IF EXISTS test_hisy;                  CREATE TABLE test_hisy (    id           bigint(11) unsigned NOT NULL AUTO_INCREMENT,    name         varchar(100) NOT NULL DEFAULT '',    type         varchar(100),  create_time  datetime,  operation    varchar(100) COMMENT '操作类型',  PRIMARY KEY (ID)  ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;  

insert触发器

表test新增记录后，将type值为“1”的记录同时插入到test_hisy表中（AFTER INSERT：录入后触发， BEFORE INSERT：录入前触发）

DELIMITER //DROP TRIGGER IF EXISTS t_after_insert_test//CREATE TRIGGER t_after_insert_testAFTER INSERT ON testFOR EACH ROWBEGIN    IF new.type='1' THEN    insert into test_hisy(name, type, create_time, operation)     values(new.name, new.type, new.create_time, 'insert');    END IF;END;//

update触发器

表test修改时，若type值为“2”则将修改前的记录同时插入到test_hisy表中（AFTER UPDATE：修改后触发， BEFORE UPDATE：修改前触发）

DELIMITER //DROP TRIGGER IF EXISTS t_before_update_test//CREATE TRIGGER t_before_update_testBEFORE UPDATE ON testFOR EACH ROWBEGIN    IF new.type='2' THEN    insert into test_hisy(name, type, create_time, operation)     values(old.name, old.type, old.create_time, 'update');    END IF;END;//

delete触发器

表test删除记录前，将删除的记录录入到表test_hisy中（AFTER DELETE：删除后触发， BEFORE DELETE：删除前触发）

DELIMITER //DROP TRIGGER IF EXISTS t_before_delete_test//CREATE TRIGGER t_before_delete_testBEFORE DELETE ON testFOR EACH ROWBEGIN    insert into test_hisy(name, type, create_time, operation)     values(old.name, old.type, old.create_time, 'delete');END;//

注：以上触发器例子中出现的new为修改后的数据， old为修改前的数据