Question

我正在尝试在db中创建具有外键的表。我错过了什么？

CREATE TABLE `users` (
`id` bigint(10) NOT NULL AUTO_INCREMENT,
`userName` varchar(24) NOT NULL DEFAULT '',
`password` varchar(32) NOT NULL DEFAULT '',
`firstName` varchar(32) NOT NULL DEFAULT '',
`lastName` varchar(32) NOT NULL DEFAULT '',
PRIMARY KEY (`id`)
 ) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=latin1


CREATE TABLE `topLevelPermissions` (
`id` bigint(10) NOT NULL AUTO_INCREMENT,
`userId` bigint(10) NOT NULL DEFAULT '0',
`user` char(1) NOT NULL DEFAULT '0',
`group` char(1) NOT NULL DEFAULT '0',
`someField` char(1) NOT NULL DEFAULT '0',
`someOtherField` char(1) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
FOREIGN KEY (`userId`) REFERENCES users (`id`) ON DELETE CASCADE
) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=latin1

我看不到任何与外键有关的内容。事实上当我

show create table topLevelPermissions;

我看到了

 CREATE TABLE `topLevelPermissions` (
 `id` bigint(10) NOT NULL AUTO_INCREMENT,
`userId` bigint(10) NOT NULL DEFAULT '0',
`user` char(1) NOT NULL DEFAULT '0',
`group` char(1) NOT NULL DEFAULT '0',
`someField` char(1) NOT NULL DEFAULT '0',
`someOtherField` char(1) NOT NULL DEFAULT '0',
 PRIMARY KEY (`id`),
 KEY `userId` (`userId`)
) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=latin1

Answer 1

Innodb仅支持外键约束。如果您想利用外键约束，请切换到Innodb。

mysql创建表，外键失败

1 个答案: