Examples of org.hibernate.Session.merge()

org.hibernate.Session.merge()
Copy the state of the given object onto the persistent object with the same identifier. If there is no persistent instance currently associated with the session, it will be loaded. Return the persistent instance. If the given instance is unsaved, save a copy of and return it as a newly persistent instance. The given instance does not become associated with the session. This operation cascades to associated instances if the association is mapped with cascade="merge".

The semantics of this method are defined by JSR-220. @param object a detached instance with state to be copied @return an updated persistent instance

     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    public T save(T object) {
        Session sess = getSession();
        return (T) sess.merge(object);
    }


    /**
     * {@inheritDoc}
     */

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                             AccountDO accountsDO = (AccountDO)session.load(AccountDO.class, 2);
                           tx.commit();
                           //accountsDO.setAccountId(2);
                           accountsDO.setName("gfeabcaaaaad");
                           accountsDO.setLoginName("gfeaaaaaaa");
                           session.merge(accountsDO);
                          
                           SlipDO slip  = (SlipDO)objectDAO.load(SlipDO.class,new Integer(21070));
                           
                         }
                         catch (Exception ex) {

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      // The new membership is transient (it has a null surrogate ID), so
      // Hibernate assumes that it should be added to the collection.
      // Inserts are done before deletes, so a ConstraintViolationException
      // will be thrown on the insert because the unique constraint on the
      // user and group IDs in the join table is violated. See HHH-2801.
      s.merge( getUser() );
      s.getTransaction().commit();
      fail( "should have failed because inserts are before deletes");
    }
    catch( ConstraintViolationException ex ) {
      // expected

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      // The new membership is transient (it has a null surrogate ID), so
      // Hibernate assumes that it should be added to the collection.
      // Inserts are done before deletes, so a ConstraintViolationException
      // will be thrown on the insert because the unique constraint on the
      // user and group IDs in the join table is violated. See HHH-2801.
      s.merge( getUser() );
      s.getTransaction().commit();
      fail( "should have failed because inserts are before deletes");
    }
    catch( ConstraintViolationException ex ) {
      // expected

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      // The new membership is transient (it has a null surrogate ID), so
      // Hibernate assumes that it should be added to the collection.
      // Inserts are done before deletes, so a ConstraintViolationException
      // will be thrown on the insert because the unique constraint on the
      // user and group IDs in the join table is violated. See HHH-2801.
      s.merge( getUser() );
      s.getTransaction().commit();
      fail( "should have failed because inserts are before deletes");
    }
    catch( ConstraintViolationException ex ) {
      // expected

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    tx.commit();
    s.close();


    s = openSession();
    tx = s.beginTransaction();
    team = (SoccerTeam)s.merge(team);
    int count = ( (Long) s.createQuery( "select count(*) from Player" ).iterate().next() ).intValue();
    assertEquals("expected count of 3 but got = " + count, count, 3);


    // clear references to players, this should orphan the players which should
    // in turn trigger orphanRemoval logic.

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    PurchaseRecord persistent = (PurchaseRecord) s.get(PurchaseRecord.class, generatedId);
    
    // show that the timestamp hasn't changed
    assertEquals( df.format(timestamp1), df.format(persistent.getTimestamp()) );
    
    s.merge(detached);
    
    t.commit();
    s.close();


    // show that the persistent object was changed only after the session flush

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    s = openSession();
    t = s.beginTransaction();
    DataPoint dpManaged = ( DataPoint ) s.get( DataPoint.class, new Long( dp.getId() ) );
    s.setReadOnly( dpManaged, true );
    DataPoint dpMerged = ( DataPoint ) s.merge( dp );
    assertSame( dpManaged, dpMerged );
    t.commit();
    s.close();


    assertUpdateCount( 0 );

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    membership = createMembership( "membership" );
    addMembership( user, group, membership );


    Session s = openSession();
    s.beginTransaction();
    s.merge( user );
    s.getTransaction().commit();
    s.close();


    s = openSession();
    s.beginTransaction();

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    group.setMemberships( new HashSet() );
    addMembership( user, group, membership );


    Session s = openSession();
    s.beginTransaction();
    s.merge( user );
    s.getTransaction().commit();
    s.close();


    s = openSession();
    s.beginTransaction();

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