Hibernate 查询方法

 1、简单查询：
  public User select(User user) {
         User newUser;
         try {
             newUser = (User) session.get(User.class,user.getId());
             return newUser;
         } catch (Exception e) {
             log.error("查询失败", e);
             return null;
         } finally {
             HibernateUtil.closeSession();
         }
     }
 2、 用?：
  public List<User>select(User user){
   String hql = "from user where emails= ? and password= ?";
   Query query = session.createQuery(hql);
   query.setString(0, user.getEmails());
   query.setString(1, user.getPassword());
   List<User> list = query.list();
   session.close();
   return list;
  }  

 3、用":+命名":
  public List<User> select(User user){
   Session session = HibernateSessionFactory.getSession();
   String hql = "from user where emails= :e and password= :p";
   Query query = session.createQuery(hql);
 {
   query.setString("e", user.getEmails());
   query.setString("p", user.getPassword());
 }else{
  query.setParameter("e", user.getEmails());
   query.setParameter("p", user.getPassword());
 }else{
  query.setProperties(user);
 }
   List<User> list = query.list();
   session.close();
   return list;
  }
 4、使用条件查询(Criteria) 没有hql语句 :
  public List<User> select(User user){
   Criteria cri = session.createCriteria(User.class);
   cri.add(Restrictions.eq("emails", user.getEmails()));
   cri.add(Restrictions.eq("password", user.getPassword()));
   List<User> list = cri.list();
   session.close();
   return list;
  }  

 5、离线条件查询:
  public List<User> select(User user){
   DetachedCriteria dc = DetachedCriteria.forClass(User.class);
   dc .add(Restrictions.eq("emails", user.getEmails()));
   dc .add(Restrictions.eq("password", user.getPassword()));
   Criteria cri = dc.getExecutableCriteria(session);
   List<User> list = cri.list();
   session.close();
   return list;
  }
 6、分页查询:
 1)  setFirstResult(int):指定从指定的位置开始查询
 2)  setMaxResult(int):指定一次查询的对象数量。