/**
* Gets and sets the database connection
*
* If a connection isn't open then this creates the connection, stores it and returns it.
* On further calls it return the original connection
* @return MongoDB
*/
private static function getMongoConnection()
{
$m = new MongoClient(self::getMongoURI());
if (self::$db === null) {
self::$db = $m->selectDB(DB_NAME);
}
return self::$db;
}
