mysql触发器实例
mysql触发器实例
测试表1?
1 2 3 4 5 6 7 8 | 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
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1 2 3 4 5 6 7 8 9 | 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)
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1 2 3 4 5 6 7 8 9 10 11 | DELIMITER // DROP TRIGGER IF EXISTS t_after_insert_test// CREATE TRIGGER t_after_insert_test AFTER INSERT ON test FOR EACH ROW BEGIN 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)
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1 2 3 4 5 6 7 8 9 10 11 | DELIMITER // DROP TRIGGER IF EXISTS t_before_update_test// CREATE TRIGGER t_before_update_test BEFORE UPDATE ON test FOR EACH ROW BEGIN 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)
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1 2 3 4 5 6 7 8 9 | DELIMITER // DROP TRIGGER IF EXISTS t_before_delete_test// CREATE TRIGGER t_before_delete_test BEFORE DELETE ON test FOR EACH ROW BEGIN 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