HibernateTemplate DAO

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class UserDAO extends HibernateDaoSupport
{
    public void addUser(User user)
    {
        this.getHibernateTemplate().save(user);
    }
    
    public void updateUser(User entity)
    {
        this.getHibernateTemplate().save(entity);
    }
    
    public void deleteUser(User entity)
    {
        this.getHibernateTemplate().delete(entity);
    }
    
    public User getUser(int entityId)
    {
        return (User) this.getHibernateTemplate().get(User.class, entityId);
    }
    
    @SuppressWarnings("unchecked")
    public List<User> findUsers()
    {
        return getHibernateTemplate().executeFind(new HibernateCallback()
            {
                @SuppressWarnings("unchecked")
                public List<User> doInHibernate(Session session)
                        throws HibernateException, SQLException
                {
                    StringBuffer sql = new StringBuffer(
                            "from User u where 1=1 ");
                    Query query = session.createQuery(sql.toString());
                    List<User> users = query.list();
                    return users;
                }
            });
    }
    
    public Long getUserNum()
    {
        return (Long) getHibernateTemplate().execute(new HibernateCallback()
            {
                public Long doInHibernate(Session session)
                        throws HibernateException, SQLException
                {
                    Query query = session
                            .createQuery("SELECT COUNT(u.userId) FROM User u");
                    return (Long) query.uniqueResult();
                }
            });
    }
    
    public static void main(String[] a)
    {
        User user = new User();
        user.setUserName("hwpokay");
        user.setSex(0);
        
        String configPath = "hvp/spring/hibernate/orm/beans.xml";
        ApplicationContext ctx = new ClassPathXmlApplicationContext(configPath);
        
        UserDAO userDAO = (UserDAO) ctx.getBean("userDAO");
        System.out.println(userDAO.getUserNum());
    }
}