function readAll()
 {
     $this->open();
     $query = 'SELECT * FROM nazionalita';
     $result = mysql_query($query);
     if (mysql_num_rows($result) <= 0) {
         return false;
     }
     $this->close();
     $toReturn = array();
     for ($i = 0; $i < mysql_num_rows($result); $i++) {
         $res = mysql_fetch_assoc($result);
         $tmp = new Nazionalita();
         $tmp->setAbbreviazione($res['abbreviazione']);
         $tmp->setValore($res['valore']);
         $toReturn[$i] = $tmp->toArray();
     }
     return $toReturn;
 }