コード例 #1
0
 public void edit(Carrera carrera) throws NonexistentEntityException, Exception {
   EntityManager em = null;
   try {
     em = getEntityManager();
     em.getTransaction().begin();
     Carrera persistentCarrera = em.find(Carrera.class, carrera.getIdCarrera());
     Collection<Alumno> alumnoCollectionOld = persistentCarrera.getAlumnoCollection();
     Collection<Alumno> alumnoCollectionNew = carrera.getAlumnoCollection();
     Collection<Alumno> attachedAlumnoCollectionNew = new ArrayList<Alumno>();
     for (Alumno alumnoCollectionNewAlumnoToAttach : alumnoCollectionNew) {
       alumnoCollectionNewAlumnoToAttach =
           em.getReference(
               alumnoCollectionNewAlumnoToAttach.getClass(),
               alumnoCollectionNewAlumnoToAttach.getIdAlumnos());
       attachedAlumnoCollectionNew.add(alumnoCollectionNewAlumnoToAttach);
     }
     alumnoCollectionNew = attachedAlumnoCollectionNew;
     carrera.setAlumnoCollection(alumnoCollectionNew);
     carrera = em.merge(carrera);
     for (Alumno alumnoCollectionOldAlumno : alumnoCollectionOld) {
       if (!alumnoCollectionNew.contains(alumnoCollectionOldAlumno)) {
         alumnoCollectionOldAlumno.setIdCarreraFK(null);
         alumnoCollectionOldAlumno = em.merge(alumnoCollectionOldAlumno);
       }
     }
     for (Alumno alumnoCollectionNewAlumno : alumnoCollectionNew) {
       if (!alumnoCollectionOld.contains(alumnoCollectionNewAlumno)) {
         Carrera oldIdCarreraFKOfAlumnoCollectionNewAlumno =
             alumnoCollectionNewAlumno.getIdCarreraFK();
         alumnoCollectionNewAlumno.setIdCarreraFK(carrera);
         alumnoCollectionNewAlumno = em.merge(alumnoCollectionNewAlumno);
         if (oldIdCarreraFKOfAlumnoCollectionNewAlumno != null
             && !oldIdCarreraFKOfAlumnoCollectionNewAlumno.equals(carrera)) {
           oldIdCarreraFKOfAlumnoCollectionNewAlumno
               .getAlumnoCollection()
               .remove(alumnoCollectionNewAlumno);
           oldIdCarreraFKOfAlumnoCollectionNewAlumno =
               em.merge(oldIdCarreraFKOfAlumnoCollectionNewAlumno);
         }
       }
     }
     em.getTransaction().commit();
   } catch (Exception ex) {
     String msg = ex.getLocalizedMessage();
     if (msg == null || msg.length() == 0) {
       Integer id = carrera.getIdCarrera();
       if (findCarrera(id) == null) {
         throw new NonexistentEntityException("The carrera with id " + id + " no longer exists.");
       }
     }
     throw ex;
   } finally {
     if (em != null) {
       em.close();
     }
   }
 }
コード例 #2
0
 public void create(Carrera carrera) throws PreexistingEntityException, Exception {
   if (carrera.getAlumnoCollection() == null) {
     carrera.setAlumnoCollection(new ArrayList<Alumno>());
   }
   EntityManager em = null;
   try {
     em = getEntityManager();
     em.getTransaction().begin();
     Collection<Alumno> attachedAlumnoCollection = new ArrayList<Alumno>();
     for (Alumno alumnoCollectionAlumnoToAttach : carrera.getAlumnoCollection()) {
       alumnoCollectionAlumnoToAttach =
           em.getReference(
               alumnoCollectionAlumnoToAttach.getClass(),
               alumnoCollectionAlumnoToAttach.getIdAlumnos());
       attachedAlumnoCollection.add(alumnoCollectionAlumnoToAttach);
     }
     carrera.setAlumnoCollection(attachedAlumnoCollection);
     em.persist(carrera);
     for (Alumno alumnoCollectionAlumno : carrera.getAlumnoCollection()) {
       Carrera oldIdCarreraFKOfAlumnoCollectionAlumno = alumnoCollectionAlumno.getIdCarreraFK();
       alumnoCollectionAlumno.setIdCarreraFK(carrera);
       alumnoCollectionAlumno = em.merge(alumnoCollectionAlumno);
       if (oldIdCarreraFKOfAlumnoCollectionAlumno != null) {
         oldIdCarreraFKOfAlumnoCollectionAlumno
             .getAlumnoCollection()
             .remove(alumnoCollectionAlumno);
         oldIdCarreraFKOfAlumnoCollectionAlumno = em.merge(oldIdCarreraFKOfAlumnoCollectionAlumno);
       }
     }
     em.getTransaction().commit();
   } catch (Exception ex) {
     if (findCarrera(carrera.getIdCarrera()) != null) {
       throw new PreexistingEntityException("Carrera " + carrera + " already exists.", ex);
     }
     throw ex;
   } finally {
     if (em != null) {
       em.close();
     }
   }
 }