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http://opensource.atlassian.com/projects/hibernate/browse/HB-520?page=com...
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Paul Malolepsy commented on HB-520:
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Has there been any more progress on this one?
The only "workaround" for this that I've been able to come up with is to
issue two queries from the criteria same criteria object. The first one gets the id's
the second one is contrained to the ids.
//set up crtieria as you wish, including pagination
myCriteria = doStuffToSetupCriteria();
myCriteria.setFirstResult((page-1)*itemsPerPage);
myCriteria.setMaxResults(itemsPerPage);
//get the list if primary keys
myCriteria.setProjection(Projections.distinct(Projections.property("myAllias.id"));
List ids = gacc.list();
//now add the id's into the restriction
myCriteria.add(Restrictions.in("myAlias.id, ids));
//clean up from the last critiera run
gacc.setProjection(null);
gacc.setFirstResult(0);
gacc.setMaxResults(Integer.MAX_VALUE);
//your results
List objects = gacc.list()
A little hacky I agree, but the only acceptable soltion I could find given this
limitiation.
Add Distinct to Criteria API
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Key: HB-520
URL:
http://opensource.atlassian.com/projects/hibernate/browse/HB-520
Project: Hibernate2
Type: New Feature
Components: core
Versions: 2.1 rc1
Environment: Hibernate 2.1+, (Any DB)
Reporter: Stephen Owens
Priority: Minor
Need the ability to specify that results of a Criteria query should be
'DISTINCT', especially when joining to a collection. So the Criteria equivalent of
the HQL statement
"select distinct parent from Parent as parent join Parent.children as child where
child.age>5"
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