@Override
public void deleteTopic(Long id) throws DAOException {
Session session = HibernateUtil.createSessionFactory().getCurrentSession();
try {
session.beginTransaction();
Topic topic = (Topic) session.get(Topic.class, id);
session.delete(topic);
session.getTransaction().commit();
} catch (HibernateException e) {
session.getTransaction().rollback();
throw new DAOException(e);
}
}
@Override
public Topic findTopicById(Long id) throws DAOException {
Session session = HibernateUtil.createSessionFactory().getCurrentSession();
Topic topic;
try {
session.beginTransaction();
topic = (Topic) session.get(Topic.class, id);
session.getTransaction().commit();
} catch (HibernateException e) {
session.getTransaction().rollback();
throw new DAOException(e);
}
return topic;
}
@Override
public List<Topic> findAllTopics() throws DAOException {
Session session = HibernateUtil.createSessionFactory().getCurrentSession();
session.beginTransaction();
List<Topic> topics;
try {
Criteria criteria = session.createCriteria(Topic.class);
topics = criteria.list();
session.getTransaction().commit();
} catch (HibernateException e) {
throw new DAOException(e);
}
return topics;
}
@Override
public void updateTopic(Topic topic) throws DAOException {
Session session = HibernateUtil.createSessionFactory().getCurrentSession();
session.beginTransaction();
Topic existingTopic = (Topic) session.get(Topic.class, topic.getId());
existingTopic.setName(topic.getName());
try {
session.save(existingTopic);
session.getTransaction().commit();
} catch (HibernateException e) {
session.getTransaction().rollback();
throw new DAOException(e);
}
}
@Override
public void createTopic(Topic topic) throws DAOException {
Session session = HibernateUtil.createSessionFactory().getCurrentSession();
try {
session.beginTransaction();
if (topic != null) {
session.save(topic);
}
session.getTransaction().commit();
} catch (HibernateException e) {
session.getTransaction().rollback();
throw new DAOException(e);
}
}