此触发器有什么问题(要在''附近使用正确的语法) [英] What is the issue with this trigger (for the right syntax to use near '' )

问题描述

当表中已经插入2列(id_prof，id_etud)但每次出现此错误

Please I did this trigger to update table rating after each insert when 2 columns (id_prof,id_etud) inserted are already in the table but it gives mi this error

> #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 6

触发器:

CREATE TRIGGER Before_Insert_Rate
BEFORE INSERT ON rating
FOR EACH ROW
BEGIN
  IF (EXISTS(SELECT * FROM rating WHERE id_prof=NEW.id_prof and id_etud = NEW.id_etud)) THEN
    UPDATE `rating` SET `rate` = NEW.rate WHERE `id_prof` = NEW.id_prof and `id_etud` = NEW.id_etud; 
    ELSE INSERT INTO rating VALUES (NEW.idprof,New.rate,New.id_etud);
  END IF
END
DELIMITER ;

推荐答案

我在查询而不是触发器上使用 ON DUPLICATE KEY 解决了它

I solved it using ON DUPLICATE KEY on a query instead of trigger

CREATE TABLE `rating` (
  `id_prof` int(11) NOT NULL,
  `rate` float NOT NULL,
  `id_etud` int(11) NOT NULL,
UNIQUE (id_prof,id_etud)
)

查询:

INSERT INTO rating (id_prof,rate,id_etud) VALUES (1,2,5)
ON DUPLICATE KEY UPDATE rate=2

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