我需要在MySQL中编写一个触发器,以确保每当将新行插入表中时,其中一个字段的值将由其他字段的值组合生成的特定值填充。
正如您所看到的,一开始我需要将name字段中的所有空格替换为-,然后将其连接为-和phone字段的值,最后将结果放入昵称字段。
触发
The following query has failed: "CREATE DEFINER=`root`@`localhost`
TRIGGER `generatenickname` BEFORE INSERT ON `Users`
FOR EACH ROW
DECLARE temp = REPLACE(NEW.name, " ", "-");
SET NEW.nickname = concat(temp + '-' + NEW.phone);"
MySQL said: #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 'DECLARE temp = REPLACE(NEW.name, " ", "-"); SET
NEW.nickname = concat(t' at line 1
如果我用开始和结束包围它;并删除"FOR EACH ROW",它不会显示错误,而是在昵称字段中放入0。
试试这个,它可以解决你的问题。
DELIMITER $$
CREATE TRIGGER `generatenickname` BEFORE INSERT ON `Users`
FOR EACH ROW
BEGIN
SET NEW.NAME = CONCAT(REPLACE(NEW.name, " ", "-") , '-' , NEW.phone);
END;
$$
DELIMITER ;
您的触发器包含多个语句,因此您需要将它们封装在BEGIN。。。END块。
请参阅文档:http://dev.mysql.com/doc/refman/5.6/en/create-trigger.htmlhttp://dev.mysql.com/doc/refman/5.6/en/trigger-syntax.html