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javatwo
 Post subject: DetachedCriteria projection support expression?
PostPosted: Mon May 10, 2010 1:31 am 
Senior
Senior

Joined: Tue Sep 13, 2005 2:01 am
Posts: 137
class Foo {
Boolean negative;
Integer value;
}

we want to sum the value like the following:
if negative, negate the value and add to the total.
otherwise, add to the total.

case negative when true then -1 else 1 end

select sum((case negative when true then -1 else 1 end) * value) from Foo;

is it possible to use Criteria API to add projection for this?

Thanks
Dave
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Zgort
 Post subject: Re: DetachedCriteria projection support expression?
PostPosted: Mon May 10, 2010 3:22 am 
Newbie

Joined: Tue May 04, 2010 8:15 am
Posts: 5
Hello Dave,

Try this one

Code:
criteria.SetProjection(Projections.Sum(Projections.SubQuery(DetachedCriteriaObj)));
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javatwo
 Post subject: Re: DetachedCriteria projection support expression?
PostPosted: Tue May 11, 2010 2:10 am 
Senior
Senior

Joined: Tue Sep 13, 2005 2:01 am
Posts: 137
Hello,

I looked at API. The Projections.SubQuery() does not exist. Also
the Projections.sum() takes a property name only. Thanks!
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hardy.ferentschik
 Post subject: Re: DetachedCriteria projection support expression?
PostPosted: Tue May 11, 2010 4:58 am 
Hibernate Team
Hibernate Team

Joined: Thu Apr 05, 2007 5:52 am
Posts: 1689
Location: Sweden
Well, this is really the wrong forum. You should post this question on the Hibernate User forum.
Just an idea though - have you looked at Projections.sqlProjection?

--Hardy
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