mybatis batch modification update

Not much to say, the above Liezi:

<update id="updateBath" parameterType="java.util.List">
    update biaoming
    <trim prefix="set" suffixOverrides=",">
        <trim prefix="update_time =case" suffix="end,">
            <foreach collection="list" item="item" index="index">
                <if test="item.updateTime != null">
                    when handle_id = #{item.handleId} then #{item.updateTime}
                </if>
            </foreach>
        </trim>
        <trim prefix="update_by =case" suffix="end,">
            <foreach collection="list" item="item" index="index">
                <if test="item.updateBy != null and item.updateBy != ''">
                    when handle_id = #{item.handleId} then #{item.updateBy}
                </if>
            </foreach>
        </trim>
        <trim prefix="transfer_object =case" suffix="end,">
            <foreach collection="list" item="item" index="index">
                <if test="item.transferObject != null and item.transferObject != ''">
                    when handle_id = #{item.handleId} then #{item.transferObject}
                </if>
            </foreach>
        </trim>
        <trim prefix="transfer_price =case" suffix="end,">
            <foreach collection="list" item="item" index="index">
                <if test="item.transferPrice != null and item.transferPrice != ''">
                    when handle_id = #{item.handleId} then #{item.transferPrice}
                </if>
            </foreach>
        </trim>
    </trim>
</update>

Mapper writing:

/**
 * 批量修改
 *
  * @param list
 * @return
 */
int updateBath(List<HandleInfo> list);