How can I insert rows into my DB daily using Cron Jobs? - php

Question

I have this Cron Job that I want to run once a day. It checks to see if it's a new day, and if it is, it inserts a new row into my database table. I use this to keep track of the daily sales for each item on my online store.
I also need it to grab the day from the last row for that product_id, increment it by 1 and then include it in my INSERT query. This is so that I can easily keep track of the current day for each product.
The MAX(time_stamp) is also illegal code, however I don't know what to replace it with. I use it to select the latest day for each item, so that the Cron Job doesn't select every single row.
I've never used Cron Jobs before, meaning that I'm a noob so please be easy on me :)
Thanks for the help! :)
Here's my code:
PHP:
// Checks if past a day
$days = DB::fetch("SELECT * FROM `daily_sales` WHERE MAX(time_stamp)<=CURRENT_DATE - INTERVAL 1 DAY;");
$numrows = count($days);
// If there is a new day
if ($numrows > 0) {
foreach ($days as $i => $day) {
// Adds a fresh day with 0 sales
$sales = 0;
$product_id = $day->product_id;
$day = // Get the day from the last row, and add 1
$time_stamp = time();
DB::query('INSERT INTO `daily_sales` (`product_id`, `sales`, `day`, `time_stamp`) VALUES (?, ?, ?, ?);', array($product_id, $sales, $day, $time_stamp));
}
}
daily_sales: (the DB table)
id | product_id | day | time_stamp | sales

Answer 1

you have to open cron job, add new job and define
how to open cron tab
crontab -e
add following to your cron tab
0 0 * * * php /full/path/to/script.php
OR
you can use mysql triggers http://www.mysqltutorial.org/mysql-triggers.aspx that will allow you to make "audit" table which will contain daly sales. So you can insert/update audit table by using "after insert".
hope this will help