Re: Can not add foreign key constraint

[David Mehler]

Hello,

  Here's the create table sand error message.

  root@localhost [(none)]> use mail;
  Database changed
  root@localhost [mail]> CREATE TABLE IF NOT EXISTS `lastauth` (
      -> `user` varchar(40) NOT NULL,
      -> `remote_ip` varchar(18) NOT NULL,
      -> `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON
  UPDATE CURRENT_TIMESTAMP,
      -> PRIMARY KEY (`user`),
      -> FOREIGN KEY (user) REFERENCES virtual_users(user) ON DELETE CASCADE
      -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  ERROR 1215 (HY000): Cannot add foreign key constraint


  For the table it's referencing here it is:

  CREATE TABLE `virtual_users` (
    `id` int(11) NOT NULL auto_increment,
    `domain_id` int(11) NOT NULL,
    `user` varchar(40) NOT NULL,
   `password` varchar(32) NOT NULL,
   `quota` bigint(20) NOT NULL DEFAULT 256,
    `quota_messages` int(11) NOT NULL DEFAULT 0,
    PRIMARY KEY (`id`),
    UNIQUE KEY `user` (`user`),
    FOREIGN KEY (domain_id) REFERENCES virtual_domains(id) ON DELETE CASCADE
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

 Hope this helps.

  Thanks.
  Dave.

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