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From: Lew <noone@lewscanon.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: The easiest framework for Java Database applications development released for production use
Date: Mon, 07 Feb 2011 21:33:14 -0500
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yaormaAdmin wrote:
> What would the code you would write to get the data from the
> message_table and echo it to the console in the example at www.yaorma.org
> look like?

You assume I would write code like that.  I wouldn't, normally.  In a toy 
example where everything fits in one 'main()' call, there's not much you can 
conclude about the utility of a framework.

The question isn't whether you can simplify a single call to a database for a 
single hard-coded query.  The question is whether you can build a robust, 
stable, extendible application backed by a database.  Knocking away a couple 
of 'close()' calls is of minor value in such a context.

But to answer your question for the toy example, something similar to

  public class Foo
  {
    @PersistenceContext( unitName = "pcontext" )
    private EntityManager em;

    public List <Message> findMessages()
    {
      final CriteriaQuery <Message> cq =
             em.getCriteriaBuilder().createQuery( Message.class );

      cq.select( cq.from( Message.class ));

      return em.createQuery( cq ).getResultList();
    }

    public static void main( String [] args )
    {
      System.out.println( new Foo().findMessages() );
    }
  }

Or I might use a JQL query instead of the 'CriteriaQuery'.  It's just that the 
criteria approach is amenable to generic treatment - my actual code has a type 
parameter for the 'Message' type.

-- 
Lew
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