6. Trigger

6. Trigger
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6.1. create trigger

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CREATE TABLE user_history SELECT * FROM user WHERE 1 <> 1

DELIMITER //
CREATE TRIGGER user_history BEFORE update ON user FOR EACH ROW
BEGIN
insert into user_history SELECT * FROM user WHERE id = OLD.id;
END; //
DELIMITER ;

6.2. drop trigger

DROP TRIGGER admin_user_history;

DELIMITER //
CREATE TRIGGER admin_user_history BEFORE update ON admin_user FOR EACH ROW
BEGIN
insert into admin_user_history SELECT * FROM admin_user WHERE user_id = OLD.user_id;
END; //
DELIMITER;

6.3. show triggers

show triggers;

6.4. EXAMPLE

例 5.1. BEFORE/AFTER

DROP TRIGGER MY_TEST_MONITOR;
DELIMITER //
CREATE TRIGGER MY_TEST_MONITOR BEFORE insert ON MY_TEST FOR EACH ROW
BEGIN
	INSERT INTO MY_TEST_MONITOR SELECT * FROM MY_TEST WHERE TICKET = NEW.TICKET;
END; //
DELIMITER;

DROP TRIGGER MY_TEST_MONITOR;
DELIMITER //
CREATE TRIGGER MY_TEST_MONITOR AFTER insert ON MY_TEST FOR EACH ROW
BEGIN
	INSERT INTO MY_TEST_MONITOR SELECT * FROM MY_TEST WHERE TICKET = NEW.TICKET;
END; //
DELIMITER;

例 5.2. uuid()

delimiter $$

CREATE TABLE `member` (
  `uuid` char(36) NOT NULL,
  `username` varchar(20) DEFAULT NULL,
  `password` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`uuid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8$$

CREATE
DEFINER=`root`@`%`
TRIGGER `test`.`member_before_insert`
BEFORE INSERT ON `test`.`member`
FOR EACH ROW
SET new.uuid = uuid()
$$

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