du9826 2011-08-30 13:50
浏览 199
已采纳

PHP :: PDO多次打开/关闭连接

Lets say I've got a function that makes calls to PHP::PDO, the function opens a connection, runs the MySQL, closes the connection, returns some data.

I haven't seen any serious problems with this, but is there any reason why this is a bad practice? What are the risks of doing this?

  • 写回答

3条回答 默认 最新

  • duanmengsuo9302 2011-08-30 13:54
    关注

    No risks that I'm aware of, but there is network lag for establishing connections. It will likely work fine now when you are just connecting to localhost, but your application will probably have scaling issues if you're establishing multiple connections for each HTTP request and you ever want to move to a secondary database server for whatever reason.

    A PHP page is inherently single-threaded, so unless you are starting up multiple threads yourself then there's no (extra) concurrency issues. It's still a good idea to use InnoDB and SQL transactions to help prevent concurrency issues across multiple requests.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(2条)

报告相同问题?

悬赏问题

  • ¥15 活动选择题。最多可以参加几个项目?
  • ¥15 飞机曲面部件如机翼,壁板等具体的孔位模型
  • ¥15 vs2019中数据导出问题
  • ¥20 云服务Linux系统TCP-MSS值修改?
  • ¥20 关于#单片机#的问题:项目:使用模拟iic与ov2640通讯环境:F407问题:读取的ID号总是0xff,自己调了调发现在读从机数据时,SDA线上并未有信号变化(语言-c语言)
  • ¥20 怎么在stm32门禁成品上增加查询记录功能
  • ¥15 Source insight编写代码后使用CCS5.2版本import之后,代码跳到注释行里面
  • ¥50 NT4.0系统 STOP:0X0000007B
  • ¥15 想问一下stata17中这段代码哪里有问题呀
  • ¥15 flink cdc无法实时同步mysql数据