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

    // make sure we get an update as a result...
    mergedParent.setName( "new name" );
    mergedParent.getChildren().add( new VersionedEntity( "child2", "new child" ) );
    s = openSession();
    s.beginTransaction();
    parent = ( VersionedEntity ) s.merge( mergedParent );
    s.getTransaction().commit();
    s.close();
    assertUpdateCount( 1 );
    assertInsertCount( 1 );
    ///////////////////////////////////////////////////////////////////////

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    clearCounts();


    p.getAddress().setStreetAddress( "321 Main" );
    SimpleJtaTransactionManagerImpl.getInstance().begin();
    s = openSession();
    p = ( Person ) s.merge( p );
    s = applyNonFlushedChangesToNewSessionCloseOldSession( s );
    SimpleJtaTransactionManagerImpl.getInstance().commit();


    assertInsertCount( 0 );
    assertUpdateCount( 0 ); // no cascade

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    s.beginTransaction();
    // load parent so that merge will follow entityIsPersistent path
    VersionedEntity persistentParent = ( VersionedEntity ) s.get( VersionedEntity.class, parent.getId() );
    // load children
    VersionedEntity persistentChild = ( VersionedEntity ) persistentParent.getChildren().iterator().next();
    VersionedEntity mergedParent = ( VersionedEntity ) s.merge( persistentParent ); // <-- This merge leads to failure
    s.getTransaction().commit();
    s.close();


    assertUpdateCount( 0 );
    assertInsertCount( 0 );

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    // node is now detached, but we have made no changes.  so attempt to merge it
    // into this new session; this should cause no updates...
    SimpleJtaTransactionManagerImpl.getInstance().begin();
    s = openSession();
    node = ( Node ) s.merge( node );
    s = applyNonFlushedChangesToNewSessionCloseOldSession( s );
    SimpleJtaTransactionManagerImpl.getInstance().commit();


    assertUpdateCount( 0 );
    assertInsertCount( 0 );

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    // as a control measure, now update the node while it is detached and
    // make sure we get an update as a result...
    node.setDescription( "new description" );
    SimpleJtaTransactionManagerImpl.getInstance().begin();
    s = openSession();
    node = ( Node ) s.merge( node );
    s = applyNonFlushedChangesToNewSessionCloseOldSession( s );
    SimpleJtaTransactionManagerImpl.getInstance().commit();
    assertUpdateCount( 1 );
    assertInsertCount( 0 );
    ///////////////////////////////////////////////////////////////////////

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    s = openSession();
    s.beginTransaction();
    persistentParent = ( VersionedEntity ) s.get( VersionedEntity.class, parent.getId() );
    persistentParent.setName( "new name" );
    persistentParent.getChildren().add( new VersionedEntity( "child2", "new child" ) );
    persistentParent = ( VersionedEntity ) s.merge( persistentParent );
    s.getTransaction().commit();
    s.close();
    assertUpdateCount( 1 );
    assertInsertCount( 1 );
    ///////////////////////////////////////////////////////////////////////

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    // parent is now detached, but we have made no changes.  so attempt to merge it
    // into this new session; this should cause no updates...
    SimpleJtaTransactionManagerImpl.getInstance().begin();
    s = openSession();
    parent = ( Node ) s.merge( parent );
    s = applyNonFlushedChangesToNewSessionCloseOldSession( s );
    SimpleJtaTransactionManagerImpl.getInstance().commit();


    assertUpdateCount( 0 );
    assertInsertCount( 0 );

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    // make sure we get an update as a result...
    ( ( Node ) parent.getChildren().iterator().next() ).setDescription( "child's new description" );
    parent.addChild( new Node( "second child" ) );
    SimpleJtaTransactionManagerImpl.getInstance().begin();
    s = openSession();
    parent = ( Node ) s.merge( parent );
    s = applyNonFlushedChangesToNewSessionCloseOldSession( s );
    SimpleJtaTransactionManagerImpl.getInstance().commit();
    assertUpdateCount( 1 );
    assertInsertCount( 1 );
    ///////////////////////////////////////////////////////////////////////

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  public void testPersistThenMergeInSameTxnWithVersion() {
    Session s = openSession();
    Transaction tx = s.beginTransaction();
    VersionedEntity entity = new VersionedEntity( "test", "test" );
    s.persist( entity );
    s.merge( new VersionedEntity( "test", "test-2" ) );


    try {
      // control operation...
      s.saveOrUpdate( new VersionedEntity( "test", "test-3" ) );
      fail( "saveOrUpdate() should fail here" );

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    // entity is now detached, but we have made no changes.  so attempt to merge it
    // into this new session; this should cause no updates...
    SimpleJtaTransactionManagerImpl.getInstance().begin();
    s = openSession();
    VersionedEntity mergedEntity = ( VersionedEntity ) s.merge( entity );
    s = applyNonFlushedChangesToNewSessionCloseOldSession( s );
    mergedEntity = ( VersionedEntity ) getOldToNewEntityRefMap().get( mergedEntity );
    SimpleJtaTransactionManagerImpl.getInstance().commit();


    assertUpdateCount( 0 );

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