Listing 19.1. Metoda usun() klasy DvdPeer
public function usun($numer_plyty)
{
    $c = new Criteria();
    $c->add(DvdPeer::NUMER, $numer_plyty);
    $dvd = DvdPeer::doSelectOne($c);
    if ($dvd) {
        $dvd->delete();
    }
}
