Examples of javax.persistence.EntityManager.detach()

javax.persistence.EntityManager.detach()
Remove the given entity from the persistence context, causing a managed entity to become detached. Unflushed changes made to the entity if any (including removal of the entity), will not be synchronized to the database. Entities which previously referenced the detached entity will continue to reference it. @param entity @throws IllegalArgumentException if the instance is not anentity

  public void detach(Object entity)
  {
    EntityManager em = getCurrent();
    
    if (em != null) {
      em.detach(entity);
      return;
    }
    
    em = createEntityManager();

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    }
    
    em = createEntityManager();
    
    try {
      em.detach(entity);
    } finally {
      freeEntityManager(em);
    }
  }

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  }


  private EntityManager delete(Object... entities) {
    EntityManager em = createEntityManager();
    for ( Object object : entities ) {
      em.detach( object );
    }
    return em;
  }


  private void commit() throws Exception {

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        sql.clear();
        List<Employee> emps = em.createQuery(query, Employee.class).getResultList();
        Assert.assertEquals(4, emps.size());
        for (Employee emp : emps) {
            em.detach(emp);


            Assert.assertNotNull(emp.getDept());
            Assert.assertEquals(2, emp.getDept().getEmployees().size());
        }
        em.close();

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  }


  private EntityManager delete(Object... entities) {
    EntityManager em = createEntityManager();
    for ( Object object : entities ) {
      em.detach( object );
    }
    return em;
  }


  private void begin() throws NotSupportedException, SystemException, Exception {

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  {
    EntityManager em = getPersistenceContext(false);
    //The detatched manager auto-detaches everything, so only
    //detach from a "real" entity manager
    if(em != detachedManager)
      em.detach(arg0);
  }


  public <T> T find(Class<T> arg0, Object arg1, Map<String, Object> arg2)
  {
    EntityManager em = getPersistenceContext(false);

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    em.getTransaction().begin();
    mouth = em.find( Mouth.class, mouth.id );
    assertNotNull( mouth );
    assertEquals( 1, mouth.teeth.size() );
    tooth = mouth.teeth.iterator().next();
    em.detach( mouth );
    assertFalse( em.contains( tooth ) );
    em.getTransaction().commit();
    em.close();


    em = getOrCreateEntityManager();

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    EntityManager em = mEmf.createEntityManager();
    NoteList notesList = null;
    try{
      notesList = em.find(NoteList.class, key);
      notesList.getNotes(); // lazy loading
      em.detach(notesList);
    } catch (Exception e) {
      e.printStackTrace();
      throw new DAOException();
    } finally {
      em.close();

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            Recliner r2 = em.find(Recliner.class, recId);
            assertNotNull("Find returned null object", r2);
            assertTrue(selectContains("REC_TABLE", _sql, "REC_STYLE", "RECID_ID", "RECID_COLOR"));
            assertFalse(selectContains("REC_TABLE", _sql, "GUY_HEIGHT", "GUY_WEIGHT", "GUY_NAME", 
                "BH_DIAMETER", "BH_DEPTH"));
            em.detach(r2);
            // Lazy embeds should be null after detach.
            assertNull("Embedded field guy is null before getter is called", r2.getGuy());
            assertNull("Embedded field holder is null before getter is called", r2.getHolder());


            // verify lazy embeds will load on access post-detach and merge

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  {
    EntityManager em = getPersistenceContext(false);
    //The detatched manager auto-detaches everything, so only
    //detach from a "real" entity manager
    if(em != detachedManager)
      em.detach(arg0);
  }


  public <T> T find(Class<T> arg0, Object arg1, Map<String, Object> arg2)
  {
    EntityManager em = getPersistenceContext(false);

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