求解释下这段代码，拜托了，各位大神，可怜可怜我这个新手吧

Question

求解释下这段代码，拜托了，各位大神，可怜可怜我这个新手吧，尤其讲讲异常处理里边Query query = 。。。都是什么意思，怎么个用法，谢谢啦

 private List<GongWenLeiBie>  findAll(String where)
    {
           Session sess = this.getSessionFactory().openSession();
             try
             {
              Query query = sess.createQuery(" From  GongWenLeiBie " + where + " order by shunXu asc ,id desc ");
              return query.list();
             }
             finally
             {
                sess.close();
             }
    }

Answer 1

Session sess = this.getSessionFactory().openSession(); //通过session工厂得到一个数据库session会话
Query query = sess.createQuery(" From GongWenLeiBie " + where + " order by shunXu asc ,id desc "); //通过数据库session会话创建一个HQL查询
return query.list(); //返回查询结果