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Improved Foreign Key Error Messages in MySQL 5.6

By Dec 26, 2015

Flite Culture

It took a small more than 10 years, but as of version 5.6 MySQL is finally using error code 1215! Since MySQL first introduced foreign key support more than 10 years ago in version 3.23.44, all the way through version 5.5, the server has always given a generic 1005 error when you try to add an invalid foreign key.

Here’s an example in MySQL 5.5, where the parent key is unsigned and the child key is signed:

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mysql> create table parent ( -> id int unsigned primary key -> ) engine = innodb; Query OK, 0 rows affected (0.01 sec) mysql> create table child ( -> id int primary key, -> parent_id int, -> foreign key fk_child_to_parent (parent_id) references parent (id) -> ) engine = innodb; ERROR 1005 (HY000): Can't create table 'test.child' (errno: 150)

Error 1005 doesn’t give me any clue about why the DDL failed. If I run SHOW ENGINE INNODB STATUS and look at the “LATEST FOREIGN KEY ERROR” section I can get more details.

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