mysql觸發器實例

 　　測試表1
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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;

　　測試表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 '操作類型',   PRIMARY KEY (ID)  ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

　　insert觸發器

　　表test新增記錄後，將type值為“1”的記錄同時插入到test_hisy表中(AFTER INSERT：錄入後觸發， BEFORE INSERT：錄入前觸發)

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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觸發器

　　表test修改時，若type值為“2”則將修改前的記錄同時插入到test_hisy表中(AFTER UPDATE：修改後觸發， BEFORE UPDATE：修改前觸發)

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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觸發器

　　表test刪除記錄前，將刪除的記錄錄入到表test_hisy中(AFTER DELETE：刪除後觸發， BEFORE DELETE：刪除前觸發)

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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：以上觸發器例子中出現的new為修改後的數據， old為修改前的數據