假设，我们的实体类或数据库中的表，字段或参数过多，我们应当考虑使用Map

int addUser2(Map<String,Object> map);
User getUserById2(Map<String,Object> map);

//insert一个用户   切记不可方法重组
    <insert id="addUser2" parameterType="map">
insert into mybatis.user (id,pwd) value (#{userid},#{userpwd});
    </insert>

<select id="getUserById2" parameterType="map" resultType="com.xxx.pojo.User">
select * from 库名.表名 user where id=#{id} and name=#{name};
</select>

@Test
    public void addUser2(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        Map<String,Object> map=new HashMap<>();
        map.put("userid",5);
        map.put("userpwd","lala");
        mapper.addUser2(map);
        sqlSession.commit();
        sqlSession.close();
    }

@Test
    public void getUserById2(){
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("id",1);
        mapper.getUserById2(map);
        sqlSession.commit();
        sqlSession.close();
    }

User getUserById2(Map<String,Object> map);

Map传递参数，直接在sql中取出key即可。-->parameterType="map"

对象传递参数，直接在sql中取对象的属性。-->parameterType="Object"