private static function buildDBFloor($dbFloor, $pdo)
 {
     $floor = Floor::__build($dbFloor['ID'], $dbFloor['NAME']);
     $stmt = $pdo->prepare("SELECT * FROM PLACES WHERE FLOOR = :id");
     $stmt->bindParam(":id", $dbFloor['ID']);
     $stmt->execute();
     while ($dbPlace = $stmt->fetch()) {
         $place = PlacesService::buildDBPlace($dbPlace);
         $floor->addPlace($place);
     }
     return $floor;
 }