public class UserDAO {
    private SessionFactory sessionFactory;

    public UserDAO() {
        sessionFactory = HibernateUtil.getSessionFactory();
    }

/*    public void dodajGatunek(Gatunek a) {
        try {
            if (!sessionFactory.getCurrentSession().getTransaction().isActive()) {
                sessionFactory.getCurrentSession().getTransaction().begin();
            }
            sessionFactory.getCurrentSession().save(a);
            sessionFactory.getCurrentSession().getTransaction().commit();
        } catch (Exception e) {
            sessionFactory.getCurrentSession().getTransaction().rollback();
            throw e;
        }
    }*/

    @SuppressWarnings("unchecked")
	public List<User> getUsers(){
        try {
            if(!sessionFactory.getCurrentSession().getTransaction().isActive()) {
                sessionFactory.getCurrentSession().getTransaction().begin();
            }
            return sessionFactory.getCurrentSession().createCriteria(User.class).list();
        }catch(Exception e) {
            return null;
        }
    }
}