[Hibernate-issues] [Hibernate-JIRA] Updated: (HB-326) Persister assigned to a class not used when persisting a Set

[<leg...@at...>]

The following issue has been updated:

    Updater: Gavin King (mailto:ga...@in...)
       Date: Thu, 11 Sep 2003 10:26 PM
    Comment:
This is not really a _bug_...

I agree that the current design, where CollectionPersister is a single class, rather than an interface, could be vastly improved.

    Changes:
             type changed from Bug
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View the issue:

  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-326


Here is an overview of the issue:
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        Key: HB-326
    Summary: Persister assigned to a class not used when persisting a Set
       Type: Improvement

     Status: Unassigned
   Priority: Major

    Project: Hibernate2
 Components: 
             core
   Versions:
             2.0 final

   Assignee: 
   Reporter: Nick Johnson

    Created: Thu, 11 Sep 2003 4:56 PM
    Updated: Thu, 11 Sep 2003 10:26 PM
Environment: JDK 1.4 on Win2k

Description:
When persisting a Set, the persister for the class defined within the Set is not used.  For example, with a mapping like this:

<class name="foo" persister="FooPersister">
   <!-- ... -->
   <set name="relatedStuff">
       <key column="related_stuff_key" />
       <one-to-many class="bar" />
   </set>
</class>

<class name="bar" persister="BarPersister">
<!-- ... -->
</class>

Operations on the set "relatedStuff" will result in SQL being generated rather than the necessary operations being handed off to BarPersister.

Another alternative or possible solution to this problem would be the ability to define a custom persister for Hibernate's collections classes; eg, "<set name="relatedStuff" persister="CustomSetPersister">"

This problem arose because we need to control how a many-to-many-style table is persisted (we use stored procedures to do inserts, updates and deletes).  Because of the way the tables are normalized and because of the requirements of the system (arbitrary linkage between collections and the necessity of interoperating with existing infrastructure) the schema looks something like this:

Group
-----
group_id    number primary key
(other attributes on group follow)

Group_member
------------
parent_group_id    number (references the group_id in Group)
child_group_id     number (ditto)

The original problem is that we've been unsuccessful in getting customized persistence for the Group_member table.  Even creating a custom persister for the Group_member table still results in SQL getting generated rather than the custom persister being used.

This turns out to be a difficult thing to describe, so if what I've said isn't terribly clear, I'm more than happy to try to clarify ambiguities.


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