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我在使用mySQL触发器时遇到了一些问题。替换触发器激活的DELETE触发器,但不是INSERT - mySQL
我有这样的工作:
CREATE TRIGGER `insert_trigger` AFTER INSERT ON `table`
FOR EACH ROW
BEGIN
IF (SELECT COUNT(*) FROM `table` WHERE userID = NEW.userID AND IP = new.IP) = 0 THEN
IF (SELECT COUNT(*) FROM `table` WHERE userID = NEW.userID) = 0 THEN
INSERT INTO `table2` VALUES(NEW.userID, (SELECT (COUNT(*)+1) FROM `table` WHERE userID = NEW.userID));
ELSE
UPDATE `table2` SET views = views+1 WHERE table.userID = NEW.userID;
END IF;
END IF;
END//
DELIMITER ;
其中具有INSERT
语句工作正常。
不过,我使用REPLACE
这似乎只是叫我DELETE
触发
CREATE TRIGGER `delete_trigger` BEFORE DELETE ON `table`
FOR EACH ROW
BEGIN
IF (SELECT views FROM `table2` WHERE userID = OLD.userID) > 1 THEN
UPDATE `table2` SET views = views-1 WHEREuserID = OLD.userID;
END IF;
END//
DELIMITER ;
当使用REPLACE
都DELETE
和INSERT
触发器应该叫。
我知道mySQL不支持多触发器。
当另一个表有INSERT
,DELETE
和REPLACE
事件发生时,获得相同结果(加/减视图)的可能解决方案是什么?
谢谢!
It's Smart answer,+1 –