Hibernate DetachedCriteria

hibernate DetachedCriteria（hibernate 分离/离线查询）

 

使用DetachedCriteria类可以在session之外构造一个查询条件，而不受session的约束。同时也很好的实现了

 

分层。并且对于动态查询也有不错的作用。

 

public static void detachedQuery(String name, Date birthday) {
  DetachedCriteria dc = DetachedCriteria.forClass(Users.class);
  List<Users> users = null;

  if (name != null && !"".equals(name)) {
   dc.add(Restrictions.eq("username", name));
  }
  if (birthday != null && !"".equals(birthday)) {
   dc.add(Restrictions.gt("birthday", birthday));
  }
  users = detachedCriteriaQuery(dc);
  if (users != null && !users.isEmpty()) {
   for (Users user : users) {
    System.out.println(user.getUsername() + "-----"
      + user.getBirthday());
   }
  }
 }

 

public static List<Users> detachedCriteriaQuery(DetachedCriteria dc) {
  List<Users> users = null;
  Session session = null;
  try {
   session=HibernateSessionFactory.getSession();
   Criteria criteria = dc.getExecutableCriteria(session);
   users = criteria.list();
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   if (session != null) {
    session.close();
   }
  }
  return users;
 }