<insert id="saveGroupStudent">
insert into group_student(group_id,stu_id,lesson_id) values
<foreach collection="group.stuId" index="index" item="item"
separator=",">
(#{groupId},#{item},#{group.lessonId})
</foreach>
</insert>
<insert id="saveGroupStudent">
insert into group_student(group_id,stu_id,lesson_id) values
<foreach collection="group.stuId" index="index" item="item"
separator=",">
(#{groupId},#{item},#{group.lessonId})
</foreach>
</insert>