public function getEvent($event_id)
    {
        $sth = $this->dbh->prepare('SELECT * FROM ' . $this->prefixTable('lcache_events') .' WHERE event_id = :event_id');
        $sth->bindValue(':event_id', $event_id, \PDO::PARAM_INT);
        $sth->execute();
        $event = $sth->fetchObject();
        if (false === $event) {
            return null;
        }
        $event->value = unserialize($event->value);
        return $event;
    }