Examples of org.hibernate.Transaction

org.hibernate.Transaction
Allows the application to define units of work, while maintaining abstraction from the underlying transaction implementation (eg. JTA, JDBC).

A transaction is associated with a Session and is usually instantiated by a call to Session.beginTransaction(). A single session might span multiple transactions since the notion of a session (a conversation between the application and the datastore) is of coarser granularity than the notion of a transaction. However, it is intended that there be at most one uncommitted Transaction associated with a particular Session at any time.

Implementors are not intended to be threadsafe. @see Session#beginTransaction() @see org.hibernate.transaction.TransactionFactory @author Anton van Straaten


      @Override
      public String call() throws Exception {
        Session session = openSession();


        Transaction transaction = session.beginTransaction();
        final Novel novel = (Novel) session.get( Novel.class, "novel-1" );
        session.delete( novel );
        transaction.commit();


        return novel.get_rev();
      }
    } ).get();
  }

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    Animal animal = createAndPersistAnimal();


    String newRevision = doConcurrentUpdateToAnimal();
    assertThat( newRevision ).isNotEqualTo( animal.getRevision() );


    Transaction transaction = session.beginTransaction();
    animal.setName( "Xavier" );
    transaction.commit();
  }

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  public void canUpdateObjectPropertyAfterUpdateOfAssociationStoredInEntity() {
    Animal animal1 = createAndPersistAnimal();
    Animal animal2 = createAndPersistAnotherAnimal();
    Zoo zoo = createAndPersistZoo( animal1 );


    Transaction transaction = session.beginTransaction();


    zoo.getAnimals().add( animal2 );
    zoo.setName( "Hilwelma" );


    transaction.commit();


    transaction = session.beginTransaction();


    zoo = (Zoo) session.get( Zoo.class, "zoo-1" );
    assertThat( zoo.getName() ).isEqualTo( "Hilwelma" );
    assertThat( zoo.getAnimals() ).onProperty( "name" ).containsOnly( "Bruno", "Berta" );


    transaction.commit();
  }

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  @Test
  public void canUpdateEntityAfterUpdateOfAssociationStoredInEntityOnInverseSide() {
    Project project = createAndPersistProjectWithProjectGroup();


    Transaction transaction = session.beginTransaction();


    project.getProjectGroup().setName( "Fancy projects" );


    transaction.commit();


    transaction = session.beginTransaction();


    ProjectGroup projectGroup = (ProjectGroup) session.get( ProjectGroup.class, "project-group-1" );
    assertThat( projectGroup.getName() ).isEqualTo( "Fancy projects" );
    assertThat( projectGroup.getProjects() ).onProperty( "name" ).containsOnly( "Validator" );


    transaction.commit();
  }

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  @Test
  public void canUpdateEntityAfterRemovalOfAssociationStoredInEntityOnInverseSide() {
    Project project = createAndPersistProjectWithProjectGroup();
    ProjectGroup projectGroup = project.getProjectGroup();


    Transaction transaction = session.beginTransaction();


    projectGroup.getProjects().remove( project );
    project.setProjectGroup( null );


    transaction.commit();


    transaction = session.beginTransaction();


    projectGroup.setName( "Fancy projects" );


    transaction.commit();


    transaction = session.beginTransaction();


    projectGroup = (ProjectGroup) session.get( ProjectGroup.class, "project-group-1" );
    assertThat( projectGroup.getName() ).isEqualTo( "Fancy projects" );
    assertThat( projectGroup.getProjects() ).isEmpty();


    transaction.commit();
  }

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    // given
    Project search = createAndPersistProjectWithUser();
    Project ogm = createAndPersistProjectWithContributor();


    // when
    Transaction transaction = session.beginTransaction();
    User bob = search.getUsers().iterator().next();
    bob.getProjects().add( ogm );
    ogm.getUsers().add( bob );
    transaction.commit();


    transaction = session.beginTransaction();
    bob.setName( "Alice" );
    transaction.commit();
    session.clear();


    // then
    transaction = session.beginTransaction();
    bob = (User) session.get( User.class, "user-1" );
    assertThat( bob.getName() ).isEqualTo( "Alice" );
    assertThat( bob.getProjects() ).onProperty( "name" ).containsOnly( "OGM", "Search" );
    transaction.commit();
  }

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    Animal animal = createAndPersistAnimal();
    Zoo zoo = createAndPersistZoo( animal );


    doConcurrentUpdateToTheZoosAnimals();


    Transaction transaction = session.beginTransaction();
    zoo.getAnimals().remove( zoo.getAnimals().iterator().next() );
    transaction.commit();
  }

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    Animal animal = createAndPersistAnimal();
    Zoo zoo = createAndPersistZoo( animal );


    doConcurrentUpdateToZoo();


    Transaction transaction = session.beginTransaction();
    zoo.getAnimals().remove( zoo.getAnimals().iterator().next() );
    transaction.commit();
  }

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  public void concurrentUpdateToObjectShouldCauseNoExceptionWithAssociationExcludedFromOptimisticLocking() throws Exception {
    Project ogm = createAndPersistProjectWithContributor();


    doConcurrentUpdateToProject();


    Transaction transaction = session.beginTransaction();
    ogm.setName( "OGM!" );
    transaction.commit();
    session.clear();


    transaction = session.beginTransaction();


    ogm = (Project) session.get( Project.class, "project-1" );
    assertThat( ogm.getName() ).isEqualTo( "OGM!" );
    assertThat( ogm.getMembers() ).onProperty( "name" ).containsOnly( "Davide", "Sanne" );


    transaction.commit();
  }

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  private Animal createAndPersistAnimal() {
    Animal animal = new Animal();
    animal.setId( "animal-1" );
    animal.setName( "Bruno" );


    Transaction transaction = session.beginTransaction();
    assertThat( animal.getRevision() ).isNull();
    session.persist( animal );
    transaction.commit();
    assertThat( animal.getRevision() ).isNotNull();


    return animal;
  }

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