【mybatis】mybatis中update更新原来的值加1

示例代码： floor的值 = floor原来的值+要更新的差距值

 <update id="updateFloor" parameterType="com.pisen.cloud.luna.ms.goods.base.common.UpdateGoodsTypeFloorBean">
        update goods_type
        set floor = floor+#{floorGap}

        where uid in
        <foreach collection="list" item="item" index="index" open="(" separator="," close=")">
            #{item}
        </foreach>
    </update>