Mysql Mybatis 批量更新

 Mapper接口

    /**
     * 批量同步更新数据
     * @param collectionBids
     */
    void updateSyncs(@Param("collectionBids") List<CollectionBid> collectionBids);

 表字段

  `user_id` bigint(20) unsigned NOT NULL DEFAULT '0' COMMENT '用户id'
  `name` varchar(50) DEFAULT NULL COMMENT '用户昵称'

mybatis更新语句 

    <update id="updateSyncs" parameterType="list">
        UPDATE `t_collection_bid`
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="user_id=case" suffix="end,">
            <foreach collection="collectionBids" item="c" index="index">
                <if test="c.userId!=null">
                    when order_number=#{c.orderNumber} then #{c.userId}
                </if>
            </foreach>
        </trim>
            <trim prefix="name =case" suffix="end,">
                <foreach collection="collectionBids" item="c" index="index">
                    <if test="c.name!=null">
                        when order_number=#{c.orderNumber} then #{c.name}
                    </if>
                </foreach>
            </trim>
        </trim>
        WHERE
        <foreach collection="collectionBids" separator="or" item="c" index="index">
            order_number=#{c.orderNumber}
        </foreach>
    </update>