当我尝试在 mysql 中创建触发器时出现语法错误

Posted 2023-03-22

【中文标题】当我尝试在 mysql 中创建触发器时出现语法错误

【英文标题】：Syntax Error when I try to create trigger in mysql

【发布时间】：2021-01-31 19:30:25

【问题描述】：

我正在尝试为审计日志创建触发器，其中插入 manageMemberLog 并且 action 列等于 CREATE，然后插入 users 表的关联列，然后抓取选择新创建的行并获取用户 ID，然后将其余数据插入配置文件，但是当我尝试提交查询时收到此错误消息。

#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 'END' at line 9

第 9 行 = 结束 IF；

我尝试仔细重新输入我写的内容，但同样的错误消息。

更新：使用了格式，它说WHERE userID = @newUserID 是错误，我仍然不明白，因为我从选择中获取数据并将值设置为@newUserID。

DELIMITER $$
CREATE TRIGGER usersDB_ai AFTER INSERT
ON manageMemberLog 
FOR EACH ROW 
    IF NEW.action = 'CREATE' THEN
        INSERT INTO users (firstName, lastName, userName, email, pwd) VALUES (NEW.firstName, NEW.lastName, NEW.userName, NEW.email, NEW.pwd);
        SET @newUserID := (SELECT userID FROM users WHERE userName = NEW.userName AND email = NEW.email); 
        UPDATE profiles SET rankID = NEW.rankID WHERE userID = @newUserID;
    END IF;
END$$
DELIMITER ;

相关表：

CREATE TABLE `users` (
  `userID` int(11) NOT NULL,
  `firstName` varchar(128) NOT NULL,
  `lastName` varchar(128) NOT NULL,
  `userName` varchar(128) NOT NULL,
  `email` varchar(128) NOT NULL,
  `pwd` varchar(128) NOT NULL
) 

DELIMITER $$
CREATE TRIGGER `userCreated` AFTER INSERT ON `users` FOR EACH ROW BEGIN 
INSERT INTO profiles (userID) VALUES(NEW.userID);
END
$$
DELIMITER ;


CREATE TABLE `profiles` (
  `profileID` int(11) NOT NULL,
  `userID` int(11) NOT NULL,
  `rankID` int(11) NOT NULL,
   ...
)

CREATE TABLE `manageMemberLog` (
  `manageMemberLogID` int(11) NOT NULL,
  `manageDate` datetime NOT NULL,
  `managerID` int(11) DEFAULT NULL,
  `action` varchar(6) CHARACTER SET utf8mb4 NOT NULL,
  `userID` int(11) DEFAULT NULL,
  `firstName` varchar(128) CHARACTER SET utf8mb4 NOT NULL,
  `lastName` varchar(128) CHARACTER SET utf8mb4 NOT NULL,
  `userName` varchar(128) CHARACTER SET utf8mb4 NOT NULL,
  `email` varchar(128) CHARACTER SET utf8mb4 NOT NULL,
  `pwd` varchar(128) CHARACTER SET utf8mb4 NOT NULL,
  `rankID` int(11) NOT NULL
)

谁能帮忙提前谢谢！

【参考方案1】：

我很傻，所以出了问题的是我忘记在 FOR EACH ROW 之后写“BEGIN”，并且不涉及它所说的任何错误。错误消息有时不可靠，但我想 END 确实有帮助。更好的错误消息是you can't end when it never began.

所以正确的查询是：

DELIMITER $$
CREATE TRIGGER usersDB_ai AFTER INSERT
ON manageMemberLog 
FOR EACH ROW BEGIN
    IF NEW.action = 'CREATE' THEN
        INSERT INTO users (firstName, lastName, userName, email, pwd) VALUES (NEW.firstName, NEW.lastName, NEW.userName, NEW.email, NEW.pwd);
        SET @newUserID := (SELECT userID FROM users WHERE userName = NEW.userName AND email = NEW.email); 
        UPDATE profiles SET rankID = NEW.rankID WHERE userID = @newUserID;
    END IF;
END$$
DELIMITER ;