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트리거 중첩트리거
use shopdb;
create table orderTbl - -구매 테이블
(orderNo Int AUTO_INCREMENT PRIMARY key,
userID VARCHAR(5),
prodName VARCHAR(5),
orderamount int
);
CREATE TABLE prodTbl --물품테이블
( prodName VARCHAR(5),
ACCOUNT int);
create table deliverTbl( --배송테이블
deliverNo INT AUTO_INCREMENT PRIMARY KEY,
PRODNAME VARCHAR(5),
ACCOUNT INT UNIQUE
);
INSERT INTO prodTbl values('apple',100);
INSERT INTO prodTbl values('tomat',100);
INSERT INTO prodTbl values('pine',100);
-- 주문테이블에 insert 되면 상품테이블에 update가 발생하는 트리거
drop trigger if exists orderTrg;
DELIMITER //
CREATE TRIGGER orderTrg
AFTER INSERT
ON orderTbl
FOR EACH ROW
BEGIN
UPDATE prodTbl SET ACCOUNT = ACCOUNT - NEW.orderamount
where PRODNAME = new.PRODNAME;
END //
DELIMITER ;
-- 상품테이블에 update가 발생하면 발송테이블에 insert가 발생
DROP TRIGGER IF EXISTS prodTrg;
DELIMITER //
CREATE TRIGGER prodTrg
AFTER UPDATE
ON prodtbl
FOR EACH ROW
BEGIN
DECLARE orderamount int;
set orderamount = old.account - new.account;
INSERT into deliverTbl(prodName,account) values(new.prodName,orderamount);
END //
DELIMITER ;
INSERT INTO orderTbl VALUES(NULL,'JONE','apple',10);
select * from prodTbl;
select * from deliverTbl;
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