Hibernate使用sql语句实现多表关联查询

/**
    * <查找list>
    *
    * @return 返回页面需要显示的数据
    */
   @SuppressWarnings("unchecked")
   public List<Map<String, String>> findUserDept()
   {
       return ht.executeFind(new HibernateCallback()
       {
           public Object doInHibernate(Session session)
               throws HibernateException,
                   SQLException
           {
               String sql =
                   "SELECT u.username name,u.password p,d.name deptName "
                       + "FROM usertable u LEFT JOIN depttable d ON u.dept_id=d.id";
               Query query =
                   session.createSQLQuery(sql)
                       .addScalar("name", Hibernate.STRING)
                       .addScalar("p", Hibernate.STRING)
                       .addScalar("deptName", Hibernate.STRING)
                       .setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);//返回List<Map>其中map的key就是我们定义的别名
               return query.list();
           }  

       });

测试代码

List<Map<String, String>> listUserDept = userService.findUserDept();
      // 循环
      for (Map<String, String> map : listUserDept)
      {
          System.out.println(map.get("name"));//key是我们写sql语句的别名
          System.out.println(map.get("p"));
          System.out.println(map.get("deptName"));
          System.out.println("---------------------------------");
      }
  }