1. Add a NamedQuery to the class:
@NamedQueries{(
@NamedQuery (name = "Note.listAll", query = "SELECT n FROM Note n")
)}
2. Use JPA code like this:
List<Note> listAll {
em = getEntityManager();
List<Note> theList = null;
try {
Query q = em.createNamedQuery("Note.listAll");
theList = q.getResultList();
Collections.sort(theList);
}
catch (Exception e)
{
java.util.logging.Logger.getLogger(getClass().getName()).log
(java.util.logging.Level.SEVERE, "exception caught", e);
throw new RuntimeException(e);
}
finally
{
em.close();
}
return(theList);
}
3. The key point is that the entity class and JPA operate on single
records
On Apr 13, 2009, at 12:04 PM, Coonay wrote:
>
> import javax.persistence.Entity
>
> @Entity
> public class Note implements IsSerializable {
> @Id
> @GeneratedValue(strategy = GenerationType.IDENTITY)
> private Long id;
> private String notePoster;
> }
>
> what is the simple method(simple means the least code) to get the all
> records for entity Note using JPA API?
>
> Note:some api calling like Note.all() is what i expect,
>
> >
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