<!-- namespace: Mpper 接口全类名 -->

<mapper namespace="com.zelin.mybatis.one2one.ClassesMapper">

<resultMap>

<id property="id" column="c_id">

<result property="name" column="c_name"

<association property="teacher" javaType="Teacher">

<id property="id" column="t_id"/>

<result property="name" column="t_name" />

</association>

</resultMap>

<select id="getId" parameterType="int" resultMap="classesMap">

select *

from m_calss mc,m_teacher mt

where mc.teacher_id = mt.t_id

AND mc.c_id = #{id} 

</select>

</mapper>