使用FOREIGN KEY的Django Mysql迁移错误150

Question

我需要帮助调试迁移。

我尝试逐步执行每个查询，以找到django迁移停止的位置。

此查询失败：

mysql> ALTER TABLE `elezioniAgendaCore_comments` ADD CONSTRAINT `elezioniAgendaCore_comments_uid_id_670175fa07fa7b47_fk_user_uid` FOREIGN KEY (`uid_id`) REFERENCES `user` (`uid`);

错误：

ERROR 1005 (HY000): Can't create table 'activedoc.#sql-3f7_2b' (errno: 150)

我有两张桌子。

TABLE用户：

mysql> show columns from user;
+-------------------+--------------+------+-----+---------+----------------+
| Field             | Type         | Null | Key | Default | Extra          |
+-------------------+--------------+------+-----+---------+----------------+
| uid               | bigint(20)   | NO   | PRI | NULL    | auto_increment |
| name              | varchar(50)  | YES  | MUL | NULL    |                |
| surname           | varchar(50)  | YES  | MUL | NULL    |                |
| email             | varchar(100) | YES  | MUL | NULL    |                |
+-------------------+--------------+------+-----+---------+----------------+

表elezioniAgenda评论：

mysql> show columns from elezioniAgendaCore_comments;
+------------------+--------------+------+-----+---------+----------------+
| Field            | Type         | Null | Key | Default | Extra          |
+------------------+--------------+------+-----+---------+----------------+
| id               | int(11)      | NO   | PRI | NULL    | auto_increment |
| signature        | varchar(255) | NO   |     | NULL    |                |
| message          | longtext     | NO   |     | NULL    |                |
| created          | datetime     | NO   |     | NULL    |                |
| published        | tinyint(1)   | NO   |     | NULL    |                |
| adempimento_id   | int(11)      | NO   | MUL | NULL    |                |
| parentComment_id | int(11)      | YES  | MUL | NULL    |                |
| uid_id           | bigint(20)   | NO   |     | NULL    |                |
+------------------+--------------+------+-----+---------+----------------+

Answer 1

我发现一个表是使用MyISAM引擎创建的：

SHOW CREATE TABLE user;

[...]

) ENGINE=MyISAM AUTO_INCREMENT=307 DEFAULT CHARSET=latin1 |

另一张表：

mysql> SHOW CREATE TABLE elezioniAgendaCore_comments;

[...]

) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

然后我迁移到InnoDB两个表。这次没有错误。