In file:
./SQL/mysql.update.sqlThere is section:
-- Updates from version 0.3.1
-- WARNING: Make sure that all tables are using InnoDB engine!!!
-- If not, use: ALTER TABLE xxx ENGINE=InnoDB;
/* MySQL bug workaround: http://bugs.mysql.com/bug.php?id=46293 */
/*!40014 SET FOREIGN_KEY_CHECKS=0 */;
ALTER TABLE `messages` DROP FOREIGN KEY `user_id_fk_messages`;
ALTER TABLE `cache` DROP FOREIGN KEY `user_id_fk_cache`;
ALTER TABLE `contacts` DROP FOREIGN KEY `user_id_fk_contacts`;
ALTER TABLE `identities` DROP FOREIGN KEY `user_id_fk_identities`;
ALTER TABLE `messages` ADD CONSTRAINT `user_id_fk_messages` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `cache` ADD CONSTRAINT `user_id_fk_cache` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `contacts` ADD CONSTRAINT `user_id_fk_contacts` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `identities` ADD CONSTRAINT `user_id_fk_identities` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;I had 0.3.1 and today was updating to 0.5.1.
The problem I faced was that when I tried to execute:
ALTER TABLE `messages` DROP FOREIGN KEY `user_id_fk_messages`;
ALTER TABLE `cache` DROP FOREIGN KEY `user_id_fk_cache`;
ALTER TABLE `contacts` DROP FOREIGN KEY `user_id_fk_contacts`;
ALTER TABLE `identities` DROP FOREIGN KEY `user_id_fk_identities`;I always got (error: 152).
#1025 - Error on rename of './base_name/messages' to './base_name/#sql2-c682-57' (errno: 152)I really wasn't able to understand why I had to drop FOREIGN KEY if my base never had such FOREIGN KEY.
In other words if I will run first:
ALTER TABLE `messages` ADD CONSTRAINT `user_id_fk_messages` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `cache` ADD CONSTRAINT `user_id_fk_cache` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `contacts` ADD CONSTRAINT `user_id_fk_contacts` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE `identities` ADD CONSTRAINT `user_id_fk_identities` FOREIGN KEY (`user_id`)
REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE;And then again:
ALTER TABLE `messages` DROP FOREIGN KEY `user_id_fk_messages`;
ALTER TABLE `cache` DROP FOREIGN KEY `user_id_fk_cache`;
ALTER TABLE `contacts` DROP FOREIGN KEY `user_id_fk_contacts`;
ALTER TABLE `identities` DROP FOREIGN KEY `user_id_fk_identities`;There will be no any problems as FOREIGN KEY is created and then dropped.
I looked back into SQL folders for old version.
In 0.1.2 FOREIGN KEY is not used in mysql.initial.sql
In 0.2 FOREIGN KEY is used in mysql.initial.sql
But there is no any word about FOREIGN KEY in mysql.update.sql for 0.2.
May be I am wrong but looks like FOREIGN KEY was lost some where in SQL update files.