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Leandro Carvalho
 Post subject: Join with Projections
PostPosted: Tue Nov 28, 2006 9:48 am 
Newbie

Joined: Tue Nov 28, 2006 9:34 am
Posts: 15
Location: Brasil
I'm trying to use Projections to bring only what i need...
But now i just need to bring the Id, Description and the Parent Description...

From a table like this example:
Table TpDoc:

int PkTpDoc
int FkTpDoc
varchar(50) DescTpDoc
manymanyotherfieldshere...

(This FkTpDoc points to PkTpDoc)

How can i do it without using HQL and creating a constructor in the class TpDoc??

Thanks!
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Ananasi
 Post subject:
PostPosted: Tue Nov 28, 2006 10:59 am 
Expert
Expert

Joined: Tue Jul 11, 2006 10:21 am
Posts: 457
Location: Columbus, Ohio
You want to use Criteria queries to project?

http://www.hibernate.org/hib_docs/v3/re ... projection

Or perhaps I'm not understanding your question.
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Leandro Carvalho
 Post subject:
PostPosted: Tue Nov 28, 2006 12:57 pm 
Newbie

Joined: Tue Nov 28, 2006 9:34 am
Posts: 15
Location: Brasil
Actually the criteria.createAlias already worked for me... Now i'm trying to Transform the result into my object...

My code:
Code:
Criteria c = getSession().createCriteria(myclass);
ProjectionList pl = Projections.projectionList();
c.createAlias("tpDoc", "tpDoc", CriteriaSpecification.LEFT_JOIN);
pl.add(Projections.property("pkTpDoc"), "pkTpDoc");
pl.add(Projections.property("descTpDoc"), "descTpDoc");
pl.add(Projections.property("tpDoc.descTpDoc"), "tpDoc.descTpDoc");
c.setProjection(pl);
c.setResultTransformer(new AliasToBeanResultTransformer(myclass));

This projection alias "tpDoc.descTpDoc" doesn't work... :(

Any suggestions?

Thanks!
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Ananasi
 Post subject:
PostPosted: Tue Nov 28, 2006 1:41 pm 
Expert
Expert

Joined: Tue Jul 11, 2006 10:21 am
Posts: 457
Location: Columbus, Ohio
Let's try this:

Code:
Criteria c = getSession().createCriteria(myclass, "child");
ProjectionList pl = Projections.projectionList();
c.createAlias("tpDoc", "parent", CriteriaSpecification.LEFT_JOIN);
pl.add(Projections.property("child.pkTpDoc"), "pkTpDoc");
pl.add(Projections.property("child.descTpDoc"), "descTpDoc");
pl.add(Projections.property("parent.descTpDoc"), "parentDescTpDoc");
c.setProjection(pl);
c.setResultTransformer(new AliasToBeanResultTransformer(myclass));


I've not used the ResultTransformer in a while, but I'll assume that's coded right for now. :)
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Leandro Carvalho
 Post subject:
PostPosted: Tue Nov 28, 2006 2:12 pm 
Newbie

Joined: Tue Nov 28, 2006 9:34 am
Posts: 15
Location: Brasil
No... :(
Code:
Could not find setter for child.pkTpDoc on class test.TpDoc


But thanks...
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