我在尝试触发时遇到了一些问题。
这是我对触发器的 MySQL 查询:
delimiter //
CREATE TRIGGER `aggiornaProduzione`
BEFORE UPDATE ON `strutture` FOR EACH ROW
BEGIN
DECLARE temp bigint;
IF ( tipo=1/*mercato*/ AND old.livello <> new.livello )
THEN (
SELECT round(2*livello*livello + 13.8*livello)
FROM strutture WHERE tipo=1 AND city=old.city INTO temp;
WHILE (temp%6<>0) temp=temp+1;
END WHILE;
UPDATE strutture SET produzione=temp WHERE city=new.city AND tipo=1;
)
END IF;
END //
错误是
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '; WHILE (temp%6<>0) temp=temp+1; END WHILE; UPDATE strutture SET ' at line 8
有人知道我为什么会收到此错误吗?
最佳答案
删除 THEN
子句两边的括号。此外,您的 WHILE
子句在语法上不正确:
delimiter //
CREATE TRIGGER `aggiornaProduzione`
BEFORE UPDATE ON `strutture` FOR EACH ROW
BEGIN
DECLARE temp bigint;
IF ( tipo=1/*mercato*/ AND old.livello <> new.livello )
THEN
SELECT round(2*livello*livello + 13.8*livello)
FROM strutture WHERE tipo=1 AND city=old.city INTO temp;
WHILE temp%6<>0 DO
SET temp=temp+1;
END WHILE;
UPDATE strutture SET produzione=temp WHERE city=new.city AND tipo=1;
END IF;
END //
关于mysql - 创建 MySQL 触发器时出现语法错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19621482/