MySQL Bugs: #4649: Foreign key does not work with special letters

Bug #4649	Foreign key does not work with special letters
Submitted:	20 Jul 2004 15:54	Modified:	30 Jul 2004 17:52
Reporter:	André Lehmann	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: InnoDB storage engine	Severity:	S3 (Non-critical)
Version:	4.1.3	OS:
Assigned to:	Marko Mäkelä	CPU Architecture:	Any

Description:
Using InnoDB tables, it is not possible to assign foreign keys to table columns with names containing letters such as '°', 'é', 'è', etc...

How to repeat:
Create a master table with 'N°' as the column name, and index it.
Create a child table with 'Master_id' as a column name, and index it.

Linking the two with a foreign key won't work. If you replace 'N°' with 'No', for example, it will work.

The same problem with Japanese Characters.

mysql>CREATE TABLE PARENT(
    ->  `?e` INT NOT NULL,
    ->   PRIMARY KEY (`?e`)
    -> ) ENGINE = INNODB;
Query OK, 0 rows affected (0.18 sec)

mysql>CREATE TABLE child(
    ->  `?e` INT NOT NULL,
    ->  child_id INT NOT NULL,
    ->  PRIMARY KEY (`?e`,child_id),
    ->  FOREIGN KEY (`?e`) REFERENCES parent(`?e`) ON DELETE CASCADE
    -> ) ENGINE = INNODB;
ERROR 1005 (HY000): Can't create table '.\test\child.frm' (errno: 150)

Note: This comment can be viewed in SJIS encoding.

InnoDB parses the foreign key constraints from the query string itself. The query string would be in the original character set, while the table names are in UTF-8. Converting the query string into UTF-8 before passing it to the InnoDB parser appears to solve the problem, at least when using latin1.

ChangeSet@1.1942, 2004-07-30 16:08:19+03:00, marko@hundin.mysql.fi
  ha_innodb.cc:
    ha_innobase::create(): pass the query string as UTF-8
    to row_table_add_foreign_constraints()  (Bug #4649)

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