当我执行以下 SQL 命令时:
INSERT INTO test_usershosts (RID,userid,hid,Usr,Pass)
VALUES (NULL,1,1,"user","pass");
我收到以下错误消息:
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint f
ails (`dm`.`test_usershosts`, CONSTRAINT `test_usershosts_ibfk_1` FOREIGN KEY (`
userid`) REFERENCES `test_users` (`userid`) ON DELETE CASCADE ON UPDATE CASCADE)
我的桌子:
CREATE TABLE IF NOT EXISTS `test_users` (
`userid` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(10) NOT NULL DEFAULT '',
`password` varchar(50) NOT NULL DEFAULT '',
PRIMARY KEY (userid)
) ENGINE=InnoDB;
INSERT INTO `test_users` (`userid`, `username`, `password) VALUES
(1120, 'guest', '12250170a9624f336ca24');
CREATE TABLE IF NOT EXISTS `test_hosts` (
`hid` int(11) NOT NULL AUTO_INCREMENT,
`UID` int(11) NOT NULL,
`name` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (hid)
) ENGINE=InnoDB;
INSERT INTO `test_hosts` (`hid`, `UID`, `name`) VALUES (30, 10, 'MU');
CREATE TABLE IF NOT EXISTS `test_usershosts` (
`RID` int(11) NULL AUTO_INCREMENT,
`userid` int(11) ,
`hid` int(11) ,
`Usr` varchar(100) ,
`Pass` varchar(100) ,
PRIMARY KEY (RID),
INDEX (userid),
INDEX (hid),
FOREIGN KEY (userid) REFERENCES test_users (userid)
ON DELETE CASCADE ON UPDATE CASCADE,
FOREIGN KEY (hid) REFERENCES test_hosts (hid)
ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB;
我研究了许多类似的案例,但找不到任何解决方案。任何帮助,将不胜感激。