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From "Martin Dirichs (JIRA)" <>
Subject [jira] Created: (OPENJPA-1070) Restore support for composite foreign keys on MySQL
Date Thu, 07 May 2009 10:30:30 GMT
Restore support for composite foreign keys on MySQL

                 Key: OPENJPA-1070
             Project: OpenJPA
          Issue Type: Bug
          Components: jdbc
    Affects Versions: 1.2.1, 2.0.0
            Reporter: Martin Dirichs
            Priority: Minor

When creating the database schema for MySQL databases, OpenJPA refuses to define foreign key
constraints for composite keys. Warning message is: openjpa.jdbc.Schema - The foreign key
"<foreignkey>" was not added to table "[...]" The reason for this is that composite
foreign key support is explicitly disabled in MySQLDictionary.

However, composite foreign keys seem to work flawlessly in recent MySQL versions (such as
5.0.51a). Probably this limitation in MySQLDictionary thus is historic and can be removed.

For the corresponding mailing list discussion, see here:

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