MyBatis中的循环插入insert foreach问题

	<insert id="saveList">
        insert into
        table (
        id ，
        column
        )values
        <foreach collection="list" item="item" index="index" separator="，" >
            (
            #{item.id}，
            #{item.column}
            )
        </foreach>
    </insert>

delete from  xxx_table where id  in 
<foreach collection="list" item="item" index="index" open="(" separator="," close=")"> 
		#{item}
</foreach>  => (1,2,3,4)

        LocalDateTime localDateTime = LocalDateTime.now();
        teacherCourseList.setCreate_time(localDateTime);
        teacherCourseList.setUpdate_time(localDateTime);
        log.info("入参======="+teacherCourseList);
 
        Map<String,Object> map=new HashMap<>();
        map.put("username",teacherCourseList.getUsername());
        map.put("CourseList",teacherCourseList.getCourseList());
        map.put("create_time",teacherCourseList.getCreate_time());
        map.put("update_time",teacherCourseList.getUpdate_time());
        courseService.batchInsert(map);

<insert id="batchInsert">
    insert into ref_teacher_course (teacher_id,course_id,create_time,update_time)
    values 
    <foreach collection="teacherCourseList.CourseList" item="item" index="index" separator=",">
        (#{teacherCourseList.username},
        #{item},
        #{teacherCourseList.create_time},
        #{teacherCourseList.update_time})
    </foreach>
</insert>

void batchInsert(@Param("teacherCourseList") Map map);