PHP怎么实施监控数据库的更新，一旦有更新，就把更新的数据推送给Android-PHP Tutorial-php.cn

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PHP怎么实施监控数据库的更新，一旦有更新，就把更新的数据推送给Android

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Jun 13, 2016 pm 12:20 PM

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PHP如何实施监控数据库的更新，一旦有更新，就把更新的数据推送给Android？
PHP实施监听数据库，数据库一单有更新，就将数据发送给PHP（听说ajax可以实现，不希望用网页实时刷新的办法，效率太低，也耗流量），当PHP取得更新的数据库后，PHP立刻将更新的数据推送给Android客户端？

附加问题，数据库需不需要写触发器，如歌可以的话，希望能有源码。
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~~百度云推送
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用定时任务跑脚本吧。
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那段话是在忽悠人，连他自己都不会相信。只是美好的愿望而已

首先，ajax 连接是由客户端发起的，即便能得到数据也不是“推送”
其次，发起新的Ajax请求、发起下个Ajax请求 这就明确的表示连接是由一次次的短连接组成的，并不存在所谓的长连接
再者，用户没有操作，则连接处于睡眠状态 既如此，如果用户一直没有操作，那不就得不到更新的内容了吗？

如果你是用的是 sql server 数据库，那么可以通过触发器调用存储过程。而 SQL server 的存储过程是可以执行系统命令的，于是你就可以通过发短信之类的形式通知用户数据已更新了
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长链接的方式是可以应该是可以达到这种效果的，可以参考微信网页版的二维码登录；

具体实现原理，按照我的理解应该是这样的：
客户端发起一个ajax请求，服务端查询数据库是否有新的数据，有则返回结果，没有则sleep 几秒再次查询，重试一定次数后不论是否成功都返回结果，客户端继续发起新的请求，重复前面的过程；

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