Hi, Look at
http://gae-java-persistence.blogspot.com/2009/10/executing-batch-gets.html & http://gae-java-persistence.blogspot.com/2009/10/optimistic-locking-with-version.html regards didier On Mar 4, 1:45 pm, lisandrodc <lisandr...@gmail.com> wrote: > Hi Didier!... > To what part of the blog do you you recount that it is associated with > my worry? > Regards > Lisandro > > On Feb 28, 2:40 am, Didier Durand <durand.did...@gmail.com> wrote: > > > Sorry, > > > Got confused with Objectify that I use now in place of JDO/JPA. > > > Look at this blog:http://gae-java-persistence.blogspot.com/ > > > You have there the needed examples to solve your problem > > > regards > > > didier > > > On Feb 27, 2:53 pm, lisandrodc <lisandr...@gmail.com> wrote: > > > > Thanks Didier, but "@Parent" It is not an annotation of JPA... > > > link:http://www.datanucleus.org/products/accessplatform_1_1/jpa/annotation... > > > What is what you say that I must place in the code? > > > > Regards > > > Lisandro > > > > On 27 feb, 04:06, Didier Durand <durand.did...@gmail.com> wrote: > > > > > Yes, > > > > > You can't update 2 entities that are not related by a parent (@Parent) > > > > - child relationship in a single transaction else GAE creates them in > > > > 2 separate entity groups and then throws an exception because a > > > > transaction can't update objects in more than 1 entity group. > > > > > See parag Entity Groups > > > > inhttp://code.google.com/appengine/docs/java/datastore/transactions.html > > > > > regards > > > > > didier > > > > > On Feb 26, 8:49 pm, lisandrodc <lisandr...@gmail.com> wrote: > > > > > > Hi ! I have an error at update an object: > > > > > > public void agregarGrupoConUsuario(Usuario usuario,Long idGrupo) { > > > > > > EntityTransaction et= em.getTransaction(); > > > > > try { > > > > > et.begin(); > > > > > ControladorGrupoTorneo cGT = new > > > > > ControladorGrupoTorneo(); > > > > > GrupoTorneo grTorneo = > > > > > cGT.devolverGrupoTorneo(idGrupo); > > > > > usuario.agregarGrupoTorneo(grTorneo); > > > > > em.merge(usuario); > > > > > et.commit(); > > > > > //the exception at commit; > > > > > > > > > > System.out.println("persistioUsuarioConGrupo"); > > > > > } finally { > > > > > > The error is: > > > > > > Caused by: java.lang.IllegalArgumentException: can't operate on > > > > > multiple entity groups in a single transaction. found both Element { > > > > > type: "GrupoTorneo" > > > > > id: 3} > > > > > > and Element { > > > > > type: "Usuario" > > > > > id: 11 > > > > > > } > > > > > > Class Usuario: > > > > > > @Entity > > > > > public class Usuario { > > > > > @Id > > > > > @GeneratedValue(strategy = GenerationType.IDENTITY) > > > > > private Key id; > > > > > > private String nombreUsuario; > > > > > > private String nombre; > > > > > > private String apellido; > > > > > > private String telefono; > > > > > > private String password; > > > > > > private String mail; > > > > > > private String imagen; > > > > > > private String ciudad; > > > > > > private String pais; > > > > > @OneToMany(cascade = {CascadeType.PERSIST, CascadeType.REMOVE, > > > > > CascadeType.REFRESH, > > > > > CascadeType.MERGE}) > > > > > private List<RegFechaUsuario> listRegFechaUsuario; > > > > > @OneToMany(cascade = {CascadeType.PERSIST, CascadeType.REMOVE, > > > > > CascadeType.REFRESH, CascadeType.MERGE}) > > > > > private List<GrupoTorneo> gruposTorneo; > > > > > /** > > > > > .... > > > > > > Class GrupoTorneo: > > > > > > @Entity > > > > > public class GrupoTorneo { > > > > > @Id > > > > > @GeneratedValue(strategy = GenerationType.IDENTITY) > > > > > private Key id; > > > > > > private String nombre; > > > > > > private String descripcion; > > > > > > private Date fechaCreacion; > > > > > > private Long idTorneo; > > > > > > private Long idUsuarioCreador; > > > > > > private String nombreUsuarioCreador; > > > > > > private Long idGrupo; > > > > > ... > > > > > ... > > > > > > Solution? > > > > > > Regards > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
