- mapper.xml
```xml
<update id="updateTablexxx">
<foreach collection="aas" item="aa" index="index" open="" close="" separator=";">
UPDATE tablexxx
<trim prefix="set" suffixOverrides=",">
<if test="aa.submitCount != null">
submit_count = #{aa.submitCount},
</if>
<if test="aa.mustSubmitWeek != null">
must_submit_week = #{aa.mustSubmitWeek},
</if>
<if test="aa.submitWeek != null">
submit_week = #{aa.submitWeek},
</if>
<if test="aa.correctCount != null">
correct_count = #{aa.correctCount},
</if>
<if test="aa.mustCorrectWeek != null">
must_correct_week = #{aa.mustCorrectWeek},
</if>
<if test="aa.correctWeek != null">
correct_week = #{aa.correctWeek}
</if>
</trim>
WHERE
class_code = #{aa.classCode}
AND teacher_code = #{aa.teacherCode}
AND course_type = #{aa.courseType}
AND student_code = #{aa.studentCode}
AND WEEK = #{aa.week}
AND del_flag = 0
</foreach>
</update>
```