[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5305) selecting elements from a collection of elements fails strangely
Gail Badner (JIRA)
noreply at atlassian.com
Thu Jun 17 17:39:20 EDT 2010
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=37491#action_37491 ]
Gail Badner commented on HHH-5305:
----------------------------------
Is this still an issue using 3.5.3?
If so, please do the following:
* checkout the trunk version http://anonsvn.jboss.org/repos/hibernate/core/trunk
* update or add a test to /testsuite/src/test/java/org/hibernate/test/compositeelement/CompositeElementTest.java that reproduces your issue
* create a patch using "svn diff" and attach to this issue
Thanks,
Gail
> selecting elements from a collection of elements fails strangely
> ----------------------------------------------------------------
>
> Key: HHH-5305
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5305
> Project: Hibernate Core
> Issue Type: Improvement
> Components: query-hql
> Affects Versions: 3.5.1
> Environment: PostgreSQL / hsqldb
> Reporter: Karsten Behrmann
> Original Estimate: 6h
> Remaining Estimate: 6h
>
> The query
> "select el from Foo f join f.elements el"
> produces a SQL select clause for merely "elements.id" (though joined correctly),
> if "elements" is a set of composite-element.
> It should rather select for all properties of the composite-element.
> Effect:
> - If there is no column called "id", the query fails database parse
> (provoke by explicitly doing <key column="fooID" />)
> - If the composite-element has more than one property, hibernate ResultSet parsing fails asking for missing col_0_1_
> - If the composite-element has one property, assignment-compatible with whatever the database column "id" happens to be, the query succeeds, returning a list of elements with the property set to the value of "id".
> So it seems like support is almost there. This may be a regression, or a not-quite-completed feature. Succeeding quietly with bad data is Not Good, but the case should not occur much in practice (composite-element with one property is not very useful).
> Workaround: explicitly select each property, as in
> "select el.name, el.created, el.importance from Foo f join f.elements el"
> and manually instantiate the element class.
> (This seems to still fail on <any> properties, but that is probably an unrelated problem)
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