如何在MySQL查询为真后触发触发的事件? [英] How do I hook into an event triggered once a MySQL query is true?
问题描述
一个人如何创建一个PHP脚本来一致地检查MySQL行，如果匹配了一个设置的查询，它将启动一个事件，例如发送电子邮件?
How does one create a PHP script that checks the MySQL row consistently and if a set query is matched, it starts an event, such as sending an email?
例如，在查询匹配项Fire上，开始发送电子邮件:
For example, on query match Fire start email:
To: me@me.com
From: php@trigger.com
Subject: Set query met, auto email complete.
它将围绕MySQL5.我被困住了.我最好在Perl或类似版本中做到吗? 也许它还可以向各种用户发送电子邮件? (这不是难事.:P)
It would be around MySQL5. I'm stuck on this. Am I best to do it in Perl or similar? Perhaps it could also email various users? (This isn't the hard bit. :P)
推荐答案
Using cron or similar scheduler involves polling, which works but is brute force and ignorance. I can't recommend it: there's a time delay between when the row changes and when cron executes the checking program; repeated checking is a waste of resources.
解决方案是数据库触发器，请参见使用触发器和可以通过触发器调用通过UDF进行外部应用程序?.每当表行着火或发生任何事情时，您都会收到一个事件，并且您的电子邮件发送程序会立即被调用.
The elegant solution is database trigger, see Using Triggers and Can triggers call an external application through a UDF?. You will get an event whenever your table row is on fire or something, and your email sending program is called immediately.
如果要使用Perl，请 Email::Simple /
If you want to use Perl, Email::Simple/Email::Sender is nifty.
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