MyBatis高级映射ResultMap解决属性问题

// 学生表  从表
public class Student {
    private int id;
    private String name;
    private Teacher teacher; // 定义主表对应bean实例
// 教师表  主表
public class Teacher {
    private int id;
    private String name;
  //teacher接口中定义方法
  @Select("select name from teacher where id = #{tid}")
    Teacher getTeacherById(@Param("tid") int id);
  // student接口中定义方法
    List<Student>  getStudent();

-- 可以直接利用多表联查sql  但是最终无法正确输出teacher类信息
select * from student s join teacher t on s.tid = t.id;
-- 将上面的sql拆开成两句  先查询到学生信息  用学生的tid字段对应教师的id查询教师
select * from student;
select * from teacher where id = #{tid}

<resultMap id="studentTeacher" type="student">
  <!--      普通映射  -->
  <result column="id" property="id"/>
  <result column="name" property="name"/>
  <!--      复杂映射 association对象  collection集合 -->
  <association property="teacher" column="tid" javaType="teacher" select="getTeacherById"/>
  <!--    student表中tid字段对应实体类student中的teacher属性 对应程序中的teacher类型 执行select语句    -->
</resultMap>

<!-- 按照结果嵌套 -->
<select id="getStudent2" resultMap="studentTeacher2">
  select s.id sid,s.name sname,t.id tid,t.name tname from student s join teacher t on s.tid = t.id;
</select>
<resultMap id="studentTeacher2" type="student">
  <result column="sid" property="id"/>
  <result column="sname" property="name"/>
  <association property="teacher" javaType="teacher">
    <result column="tid" property="id"/>
    <result property="name" column="tname"/>
  </association>
</resultMap>

public class Teacher {
  private int id;
  private String name;
  private List<Student> student;
public class Student {
  private int id;
  private String name;
  private int tid;

// TeacherMapper
// 指定老师下面的所有学生
Teacher getTeaById(@Param("teaId") int id);

<select id="getTeaById" resultMap="TeaStu">
  select s.id sid, s.name sname, t.name tname, t.id tpid,s.tid
  from student s ,teacher t
  where t.id = s.tid and t.id = #{teaId};
</select>
<resultMap id="TeaStu" type="Teacher">
  <result column="tpid" property="id"/>
  <result column="tname" property="name"/>
  <collection property="student" ofType="student">
    <result column="sid" property="id"/>
    <result column="sname" property="name"/>
    <result column="tid" property="tid" />
  </collection>
</resultMap>

<select id="getTeaById" resultMap="TeaStu2">
  select id,name from teacher where id = #{teaId}
</select>
<resultMap id="TeaStu2" type="teacher">
  <result column="id" property="id"/>
  <result column="name" property="name"/>
  <collection property="student" javaType="ArrayList" ofType="student" select="getStuList" column="id"/>
</resultMap>
<select id="getStuList" resultType="student">
  select id,name,tid from student where tid = #{tid}
</select>