Question

I have a mongodb that will be storing visitor data. I need to delete the data after ten minutes of not being active and will run a command through a cron. How would I do this?

Currently the collection is setup like so:

{ "_id" : ObjectId("4fd33e0b0feeda3b2406f6be"), "name" : "Dugley Reanimator", "updated" : "Some form of timestmap" }

How should I go about storing a timestamp that I search the collection with I.E for my MySql version:

$sql = mysql_query('DELETE FROM `visitors` WHERE NOW() > DATE_ADD(`last_seen`, INTERVAL 10 MINUTE)');

Answer 1

Your driver will use a MongoDate time (this may map to a more native representation in PHP).
You can then query using something like the following mongo statement:

db.myCollection.find({updated : { $lte : new ISODate("2012-06-09T16:22:50Z") } })

A rough translation for PHP would be:

$search = array(
  'updated' => array(
    '$lte' => new MongoDate($tenMinutesAgo))
);
$collection->find($search)

Or (Caveat: not tested):

$tenMinutesAgo = new DateTime();
$tenMinutesAgo->modify('-10 minutes');

$search = array('updated' => array('$lte' => $tenMinutesAgo));
$collection->find($search)