mybatis中session.getMapper()方法和resultMap

session.getMapper()方法的使用：

定义接口

/**
* 查询所有
* @return
*/
public List<Student> getAll();

SQL映射文件，做如下设置

<mapper namespace="cn.happy.dao.IStudentDAO">

<select id="getAll" resultMap="studentMap" useCache="false">    select * from student</select>

</mapper>

测试类：

/** * 查询所有 */@Testpublic void getAll() throws Exception{    SqlSession session = MyBatisUtil.getSession();    IStudentDAO mapper = session.getMapper(IStudentDAO.class);    List<Student> all = mapper.getAll();    for (Student item:all){        System.out.println(item.getId()+   item.getName()+   item.getAge());    }    //提交事务    session.commit();    //关闭会话，释放资源    session.close();}

resultMap实现结果映射