Hibernate 级联添加删除

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我是靠谱客的博主怕孤独河马，最近开发中收集的这篇文章主要介绍Hibernate 级联添加删除，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

 
      问题描述：实体类答案从属于实体类问题。（一对多） 
     
      /** 
     
      * 添加 问题 和 选项 
     
      * @throws Exception 
     
      */ 
      @Test 
     
      public void testQu() throws Exception { 
     
      Session session = HibernateUtil.currentSession(); 
     
      Transaction tr = session.beginTransaction(); 
     
      //级联添加 
     
      Set options =  
      new  
      HashSet(); 
     
      Options op1 =  
      new  
      Options(); 
     
      op1.setName( 
      "op1" 
      ); 
     
      options.add(op1); 
     
      Options op2 =  
      new  
      Options(); 
     
      op2.setName( 
      "op2" 
      ); 
     
      options.add(op2); 
     
      Options op3 =  
      new  
      Options(); 
     
      op3.setName( 
      "op3" 
      ); 
     
      options.add(op3); 
     
      Problems problems =  
      new  
      Problems(); 
     
      problems.setName( 
      "problem_1" 
      ); 
     
      problems.setOptions(options); 
     
      problems.setTdesc( 
      "tdesc" 
      ); 
     
      problems.setType(1); 
     
      Long ll = (Long)session.save(problems); 
     
      System.out.println(ll); 
     
      tr.commit(); 
     
      mysql> select * from options ; 
     
      +----+------------+--------+------+---------+ 
     
      | id | problemsid | answer | name | visible | 
     
      +----+------------+--------+------+---------+ 
     
      |  1 |          1 |   NULL | op2  |       0 | 
     
      |  2 |          1 |   NULL | op3  |       0 | 
     
      |  3 |          1 |   NULL | op1  |       0 | 
     
      +----+------------+--------+------+---------+ 
     
      3 rows  
      in  
      set (0.00 sec) 
     
      mysql> select * from problems ; 
     
      +----+-----------+------+-------+------------+---------+ 
     
      | id | name      | type | tdesc | questionid | visible | 
     
      +----+-----------+------+-------+------------+---------+ 
     
      |  1 | problem_1 |    1 | tdesc |       NULL |       0 | 
     
      +----+-----------+------+-------+------------+---------+ 
     
      1 row  
      in  
      set (0.00 sec) 
     
      //级联删除 
     
      tr.begin(); 
     
      session. 
      delete 
      ( session.get(Problems. 
      class 
      ,ll) ); 
     
      tr.commit(); 
     
      mysql> select * from problems ; 
     
      Empty set (0.00 sec) 
     
      mysql> select * from options ; 
     
      Empty set (0.00 sec)  
     
      HibernateUtil.closeSession(); 
     
      } 
     
      Options类 
     
      ....... 
     
      /** 
     
      * @hibernate.many-to-one  
     
      *         cascade = "save-update" 
     
      *         column = "Problemsid" 
     
      *         class = "com.zhongqi.domain.Problems" 
     
      * @return 
     
      */ 
     
      public Problems getProblems() { 
     
      return  
      problems; 
     
      } 
     
      ............ 
     
      Problems 类 
     
      /** 
     
      * @hibernate.set 
     
      *         cascade="all-delete-orphan" 
     
      *         inverse = "false" 
     
      *         lazy = "true" 
     
      *         @hibernate.collection-key  column = "problemsid" 
     
      *         @hibernate.collection-one-to-many class = "com.zhongqi.domain.Options" 
     
      * @return 
     
      */ 
     
      public Set getOptions() { 
     
      return  
      options; 
     
      }