vaninh0,
you can only create owned relationships in the datastore if the
child's key is of type com.google.appengine.api.datastore.Key or
String ("Key as Encoded String").
Check this part of the documentation:
http://code.google.com/appengine/docs/java/datastore/creatinggettinganddeletingdata.html#Keys
Cheers,
jpt
On Nov 18, 12:15 pm, vaninh0 <[email protected]> wrote:
> Ops, I posted with one mistake... correcting:
>
> �...@entity(name = "Usuario")
> �...@table(name = "usuario")
> public class Usuario {
> �...@id
> �...@column(name = "id_usuario")
> �...@generatedvalue(strategy = GenerationType.IDENTITY)
> private Long id;
> �...@manytoone(fetch = FetchType.LAZY)
> �...@joincolumn(name = "id_empresa")
> private Empresa empresa;
>
> }
>
> On 18 nov, 08:13, vaninh0 <[email protected]> wrote:
>
>
>
>
>
>
>
> > I have these Entities:
>
> > @Entity(name = "Empresa")
> > @Table(name = "empresa")
> > public class Empresa {
> > @Id
> > @Column(name = "id_empresa")
> > @GeneratedValue(strategy = GenerationType.IDENTITY)
> > private Long id;
>
> > }
>
> > and
>
> > @Entity(name = "Usuario")
> > @Table(name = "usuario")
> > public class Usuario {
> > @Id
> > @Column(name = "id_usuario")
> > @GeneratedValue(strategy = GenerationType.IDENTITY)
> > private Long id;
> > @ManyToOne(fetch = FetchType.LAZY)
> > @JoinColumn(name = "id_empresa")
>
> > }
>
> > I have inserted many of Empresas and now I wanna insert a new Usuario
> > with a inserted Empresa, but I got this exception:
>
> > javax.persistence.PersistenceException: Error in meta-data for
> > br.com.controlecartao.core.entity.Empresa.id: Cannot have a
> > java.lang.Long primary key and be a child object (owning field is
> > br.com.controlecartao.core.entity.Usuario.empresa).
>
> > I´m using the method MERGE, but I don´t know if this method is correct
> > to to this.
>
> > What´s the correct way to do this?
> > Where am I wrong?
>
> > Thank you.
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