我有一个触发器,可以将新行插入到另一个表中,但是某处出现错误,因为它告诉我我的值是 NULL,但它们不是或至少不应该是。
触发器代码
分隔符//
CREATE TRIGGER new_active_user AFTER UPDATE ON `pre_reg`
FOR EACH ROW
BEGIN
DECLARE currentUser INT;
DECLARE banned INT;
DECLARE user_type INT;
DECLARE username VARCHAR (25);
DECLARE password VARCHAR (60);
DECLARE usersince datetime;
DECLARE email varchar(40);
SET @currentUser := (select `id` FROM `pre_reg` WHERE `active` = 1);
SET @banned = 0;
SET @user_type = 3;
SET @username := (select `username` FROM `pre_reg` WHERE `id` = currentUser);
SET @password := (select `password` FROM `pre_reg` WHERE `id` = currentUser);
SET @usersince := (select `date` FROM `pre_reg` WHERE `id` = currentUser);
SET @email := (select `email` FROM `pre_reg` WHERE `id` = currentUser);
INSERT INTO `users` (`id`, `username`, `password`) VALUES (@currentUser, @username, @password);
END//
Delimiter ;
我什至尝试在 SET 用户名、密码、电子邮件 SET 语句中对 currentUser 的值进行硬编码。但是它不起作用,我收到以下错误:
错误
SQLSTATE[23000]:违反完整性约束:1048 列“用户名”不能为空
我什至尝试只输入 ID (@currentUser) 以确保其设置,其余部分都是硬编码的(工作正常!所以我假设错误出现在 SET 语句中,但无法弄清楚它总是告诉我什么该值为 NULL
这就是我创建表格的方式
CREATE TABLE `pre_reg` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(25) NOT NULL,
`password` varchar(60) NOT NULL,
`email` varchar(40) NOT NULL,
`authentication` varchar(32) NOT NULL,
`active` smallint(1) NOT NULL DEFAULT '0',
`date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`id`),
UNIQUE KEY `username` (`username`,`email`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
GO
CREATE TABLE `users` (
`id` INT PRIMARY KEY,
`username` VARCHAR (25) NOT NULL,
`password` VARCHAR (60) NOT NULL,
`banned` SMALLINT NOT NULL DEFAULT 0,
`user_since` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP
)ENGINE=InnoDB DEFAULT CHARSET=latin1
GO
最佳答案
这可能就是您想要的:
Delimiter //
CREATE TRIGGER new_active_user AFTER UPDATE ON `pre_reg`
FOR EACH ROW
BEGIN
INSERT INTO `users` (`id`, `username`, `password`)
VALUES (new.id, new.username, new.password);
END//
Delimiter ;
它会将 pre_reg
中刚刚更新的内容插入到 users
表中。
关于mysql - MySQL TRIGGER 内的语法错误 -> Insert Into Statement,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27894750/