Here are the known MySQL issues --
http://openjpa.apache.org/builds/latest/docs/manual/manual.html#dbsupport_mysql_issues.
-Rick
Martin Dirichs wrote:
>
> Hi,
>
> wondering why OpenJPA's MappingTool refused to add a foreign key
> constraint to the database (error message: openjpa.jdbc.Schema - The
> foreign key "<foreignkey>" was not added to table "[...]"), I discovered
> that composite foreign key support is explicitly disabled for MySQL. These
> are the relevant code lines in
> org.apache.openjpa.jdbc.sql.MySQLDictionary:
>
> protected String getForeignKeyConstraintSQL(ForeignKey fk) {
> // mysql does not support composite foreign keys
> if (fk.getColumns().length > 1)
> return null;
> return super.getForeignKeyConstraintSQL(fk);
> }
>
> For all I know, composite foreign keys are possible with MySQL. At least,
> a statement like
>
> ALTER TABLE detail ADD CONSTRAINT constraint_x FOREIGN KEY (masterId1,
> masterId2) REFERENCES master (masterId1, masterId2);
>
> works perfectly well. Are there other deficits with MySQL foreign key
> handling I am not aware of or are the above lines in MySQLDictionary.java
> outdated / wrong?
>
> Regards,
> Martin.
>
>
--
View this message in context:
http://n2.nabble.com/Composite-foreign-keys-with-MySQL-tp2772257p2772619.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.
