mybatis-update语句的foreach使用

<update id="updateStudyTargetBatch">
    <foreach collection="studyTarget" item="item" index="index" separator=";">
        UPDATE tp_study_target
            <set>
                <if test="item.description != null or item.description != ''">
                    description = #{item.description},
                </if>
                <if test="item.courseObjectiveId != null">
                    course_objective_id = #{item.courseObjectiveId},
                </if>
            </set>
        WHERE
            id = #{item.studyTargetId}
    </foreach>
</update>

参考博客:https://blog.csdn.net/qq_32786873/article/details/72640311