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Guevara
 Post subject: Criteria to select columns from a table [Solved]
PostPosted: Mon May 03, 2010 4:01 pm 
Beginner
Beginner

Joined: Sat Oct 03, 2009 1:51 pm
Posts: 26
Hi everybody!
I need to create a Criteria using this sql select:
Code:
select code, title, city, date from book;

In this link i can not mount this what I wanted:
http://docs.jboss.org/hibernate/core/3. ... teria.html
Thanks!


Last edited by Guevara on Tue May 11, 2010 4:53 pm, edited 1 time in total.

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Guevara
 Post subject: Re: Criteria to select columns from a table
PostPosted: Tue May 04, 2010 3:42 pm 
Beginner
Beginner

Joined: Sat Oct 03, 2009 1:51 pm
Posts: 26
could anyone help?
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Guevara
 Post subject: Re: Criteria to select columns from a table
PostPosted: Mon May 10, 2010 4:02 pm 
Beginner
Beginner

Joined: Sat Oct 03, 2009 1:51 pm
Posts: 26
Up! ¬¬
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Guevara
 Post subject: Re: Criteria to select columns from a table
PostPosted: Mon May 10, 2010 4:04 pm 
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Beginner

Joined: Sat Oct 03, 2009 1:51 pm
Posts: 26
Up! ¬¬
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Quaternion
 Post subject: Re: Criteria to select columns from a table
PostPosted: Mon May 10, 2010 4:38 pm 
Newbie

Joined: Mon May 10, 2010 1:41 pm
Posts: 15
Not certain exactly what you mean:

If you need to SELECT only part of an object with criteria then you are looking to use Projections (Think of Projection as SELECT), for a working example please see:

http://www.roseindia.net/hibernate/proj ... ions.shtml

In the reference manual see: 16.7. Projections, aggregation and grouping
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Guevara
 Post subject: Re: Criteria to select columns from a table
PostPosted: Tue May 11, 2010 4:08 pm 
Beginner
Beginner

Joined: Sat Oct 03, 2009 1:51 pm
Posts: 26
If I have:
Code:
public List<Messages> list() {
      return session.createCriteria(Message.class, "m")
      .setProjection(Projections.projectionList()
            .add( Projections.property("m.subject").as("subject") )
            .add( Projections.property("m.message").as("message") )
            ).setResultTransformer(new AliasToBeanResultTransformer(Message.class)).list();
   }

Where put the FK of Contact ID?
Image
assunto = subject
mensagem = message
contato_id_contato = id contact

Thanks!
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Guevara
 Post subject: Re: Criteria to select columns from a table
PostPosted: Tue May 11, 2010 4:52 pm 
Beginner
Beginner

Joined: Sat Oct 03, 2009 1:51 pm
Posts: 26
Solved!
Code:
@SuppressWarnings("unchecked")
   public List<Mensagem> lista(Long idContato) {       
      return session.createCriteria(Mensagem.class, "m")
      .setProjection(Projections.projectionList()
            .add( Projections.property("m.assunto").as("assunto") )
            .add( Projections.property("m.mensagem").as("mensagem") )
            ).setResultTransformer(new AliasToBeanResultTransformer(Mensagem.class))
            .add(Restrictions.idEq(idContato))
            .setMaxResults(10).list();
    } 

Thanks!
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