public function getAll()
 {
     $sql = "SELECT viewerID, username, viewer FROM viewers";
     $dbh = new PDO(DBConfig::$DB_CONNSTRING, DBConfig::$DB_USERNAME, DBConfig::$DB_PASSWORD);
     $resultSet = $dbh->query($sql);
     $lijst = array();
     foreach ($resultSet as $rij) {
         $userDAO = new UserDAO();
         $user = $userDAO->getByUsername($rij["username"]);
         //            var_dump($user);
         $viewer = $userDAO->getByUsername($rij["viewer"]);
         //            var_dump($viewer);
         $viewerLijst = Viewer::create($rij["viewerID"], $user, $viewer);
         array_push($lijst, $viewerLijst);
     }
     $dbh = null;
     return $lijst;
 }