假設我們的資料庫中的表的欄位過多，可以考慮使用map

• 示例一：Map查詢資料

  • 介面類

    User selectByIdAndName(Map<String,Object> map);

  • 介面類的實現

    <select id="selectByIdAndName" parameterType="map"         resultType="User">
       select * from mybatistest where id = #{Id} and name = #{Name};
     
    </select>

  • 測試

    public static void selectByIdAndName(){
      SqlSession sqlSession = MybatisUtils.getSqlSession();
    ​
      UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
      Map<String,Object> map = new HashMap<String, Object>();
      map.put("Id",1);
      map.put("Name","洪夢霞");
      User user = userMapper.selectByIdAndName(map);
     
      System.out.println(user);
    ​
      sqlSession.close();
    }

• 示例二：Map插入資料

  • 介面類

    int insertUser(Map<String,Object> map);

  • 介面類的實現

    <insert id="insertUser" parameterType="map">
       insert into mybatistest (id,name,pwd) values (#{mapId},#{mapName},#{mapPwd});
    </insert>

  • 測試

    public static void insertUser(){
     
      SqlSession sqlSession = MybatisUtils.getSqlSession();
    ​
      UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
      Map<String, Object> map = new HashMap<String, Object>();
      map.put("mapId",4);
      map.put("mapName","小葉子");
      map.put("mapPwd","985");
      userMapper.insertUser(map);
      sqlSession.commit();
    ​
      sqlSession.close();
    }