如何从数据库中自动触发电子邮件发送

Question

Hello I'm battling with some problem here. I have a message in my mysql database that I want to send based on the scheduled date is there any way to do this : that when is the exact date the server should send the maill by itself, OR is there anyway to make a page load itself everyday without my access to send the email(if no one visit the site). Thanks. I'm using php and mysql db. I have scheduleddate column in my database

Answer 1

You could use a cron job to call a script which checks the database at a set interval (perhaps once per hour) and then have that script pull out the relevant messages and sends them.

The cron for that would look something like:

0 * * * * /path/to/email/script.php

This script could then query the database and send those messages which need sending. Of course you could set this to run every single minute ( * * * * * ), but I'd be very wary of having any script run every single minute!

This isn't really ideal thought, and instead you should look at using some form of queue management. If you take a look at queues.io you can find lots of info on various popular queue projects projects.

I also found this post on setting up background jobs using resque very helpful!

Of course how you integrate such a system is very much dependent on your codebase and your environment.

Some frameworks have this kinda functionality integrated very well, I have worked with Laravel 4's queue component quite a lot and it really does make it very easy to work with..

In reality many people just end up using a cron/script combo to do the job, but it's important to know there are other (better) ways to achieve this.

Answer 2

The best way to do this without killing your CPU utilization is by scheduling it via a scheduled cron task on your server. Write your code to send the email, then add that page to a daily cron in your server's Admin Control Panel.