public static function findByValeur($valeur)
 {
     $data = BaseSingleton::select('SELECT stockage.id as id, ' . 'stockage.valeur as valeur, ' . 'stockage.visible as visible ' . ' FROM stockage' . ' WHERE LOWER(stockage.valeur) = LOWER(?)', array('i', &$valeur));
     $stockages = new Stockage();
     if (sizeof($data) > 0) {
         $stockages->hydrate($data[0]);
     } else {
         $stockages = null;
     }
     return $stockages;
 }