Question

我试图看看另一个人的问题，但他们似乎与我的不同。

我的问题是我一直收到ERROR 1452问题“ERROR 1452（23000）：无法添加或更新子行：外键约束失败”即使我认为外键受到约束。

我的桌子是

CREATE TABLE `Users` (
  `id` int(11) unsigned NOT NULL,
  `username` varchar(255) NOT NULL,
  `email` varchar(255) NOT NULL,
  `joinTime` datetime DEFAULT NULL,
  `isRemoved` tinyint(3) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  UNIQUE KEY `email` (`email`),
  UNIQUE KEY `username` (`username`),
  KEY `isRemoved` (`isRemoved`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

CREATE TABLE `RoleGroups` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `name` text NOT NULL,
  `description` text NOT NULL,
  `createdTime` datetime NOT NULL,
  `lastUpdate` datetime DEFAULT NULL,
  `isRemoved` tinyint(3) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  KEY `isRemoved` (`isRemoved`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1

CREATE TABLE `RoleGroupsUsers` (
  `groupId` int(11) unsigned NOT NULL,
  `userId` int(11) unsigned NOT NULL,
  `addedTime` datetime NOT NULL,
  KEY `fkGroup_groupId` (`groupId`),
  KEY `fkGroup_userId` (`userId`),
  CONSTRAINT `fkGroup_groupId` FOREIGN KEY (`groupId`) REFERENCES `RoleGroups` (`id`),
  CONSTRAINT `fkGroup_userId` FOREIGN KEY (`userId`) REFERENCES `Users` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

我隐藏了Users表中的一些属性以简化问题。

我目前的数据是

mysql> SELECT id, username, joinTime FROM Users ORDER BY joinTime ASC;
+----------+-----------+---------------------+
| id       | username  | joinTime            |
+----------+-----------+---------------------+
|        1 | admin     | 2011-07-22 01:20:29 |
|        2 | johndoe   | 2011-07-22 01:26:07 |
|        3 | janedoe   | 2011-07-22 01:26:07 |
| 31201958 | yonas1    | 2011-07-22 01:32:38 |
| 49494052 | bvnarayan | 2011-07-22 11:51:05 |
+----------+-----------+---------------------+
5 rows in set (0.00 sec)

mysql> SELECT * FROM RoleGroups;
+----+---------------+---------------+---------------------+------------+-----------+
| id | name          | description   | createdTime         | lastUpdate | isRemoved |
+----+---------------+---------------+---------------------+------------+-----------+
|  1 | member        | Member        | 2011-07-22 01:20:29 | NULL       |         0 |
|  2 | administrator | Administrator | 2011-07-22 01:20:29 | NULL       |         0 |
+----+---------------+---------------+---------------------+------------+-----------+
2 rows in set (0.00 sec)

mysql> SELECT * FROM RoleGroupsUsers;
+---------+----------+---------------------+
| groupId | userId   | addedTime           |
+---------+----------+---------------------+
|       2 |        1 | 2011-07-22 01:20:29 |
|       1 |        1 | 2011-07-22 01:20:29 |
|       1 |        2 | 2011-07-22 01:26:07 |
|       1 |        3 | 2011-07-22 01:26:07 |
|       1 | 31201958 | 2011-07-22 01:32:38 |
+---------+----------+---------------------+
5 rows in set (0.00 sec)

当我尝试

时弹出错误

mysql> INSERT INTO RoleGroupsUsers (groupId, userId, addedTime) VALUES (1, 49494052, '2011-07-22 14:51:05');
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`roswell`.`rolegroupsusers`, CONSTRAINT `fkGroup_groupId` FOREIGN KEY (`groupId`) REFERENCES `RoleGroups` (`id`))

这真的很奇怪，因为在RoleGroups表中已经有一行ID为1.而更令人奇怪的是，这个错误在我的一个工作站中不断发生而另一个运行良好。我的开发工作站使用Windows 7和XAMPP服务器。我的其他工作站使用OS X和MAMP。

更新

几小时前它在第二个工作站工作但我不知道为什么它现在不起作用。（可能是因为我在第二个工作站中做了一些我不知道的配置）

再次更新

MySQL版

#/Applications/MAMP/Library/bin/mysql --version
/Applications/MAMP/Library/bin/mysql  Ver 14.14 Distrib 5.5.9, for osx10.4 (i386) using  EditLine wrapper

Answer 1

您需要在OSX计算机上升级MySQL。这是OSX上MySQL版本5.5.9到5.5.12中的一个错误。

请参阅：MySQL bug report，MySQL 5.5.13 patch notes（参考第2项）

奇怪的错误1452（23000）：无法添加或更新子行：外键约束失败

1 个答案: