[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-1829) Allow join on any property using property-ref

[Andrew Seales (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1829?page=all ]

Andrew Seales updated HHH-1829:
-------------------------------

    Attachment: hhh-1829.patch

I've started working on a patch for this issue as
we're using a legacy database and need to do a join that doesn't use a
primary key. I have a working patch at the moment which seems to fix the
issue(at least for our uses), although I'm not sure how 'nice' it is.

When I looked through the code, I couldn't see the 'property-ref'
attribute in the <key> tag being stored anywhere so I have added it to
the KeyValue interface. This value is also stored in the
AbstractEntityPersister class, similarly to rootTableKeyColumnNames.
When the join is made, a check is performed to see if an alternative key
should be used in the join. If there is no property-ref specified then
the primary keys are used, otherwise the property-ref column is used.



> Allow join on any property using property-ref
> ---------------------------------------------
>
>          Key: HHH-1829
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1829
>      Project: Hibernate3
>         Type: New Feature

>   Components: core
>     Versions: 3.2.0 cr1, 3.2.0.cr2
>     Reporter: Maarten Winkels
>  Attachments: hhh-1829.patch
>
>
> Currently joining tables for one class (uing the <join...> tag) is only supported for the id property. The property-ref is allowed on the <key..> tag inside the <join..> tag, but this is ignored.

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