public static function add(Conference $model)
 {
     if ($model->getId()) {
         throw new \Exception('This entity is not new');
     }
     self::$insertObjectPool[] = $model;
 }
 private static function update(Conference $model)
 {
     $db = Database::getInstance('app');
     $query = "UPDATE conference SET name= :name, date= :date, hall_id= :hall_id, break1= :break1, break2= :break2 WHERE id = :id";
     $result = $db->prepare($query);
     $result->execute([':id' => $model->getId(), ':name' => $model->getName(), ':date' => $model->getDate(), ':hall_id' => $model->getHall_id(), ':break1' => $model->getBreak1(), ':break2' => $model->getBreak2()]);
 }
 private static function insert(Conference $model)
 {
     $db = Database::getInstance('app');
     $query = "INSERT INTO conferences (ownerid,administratorid,venueid,name,startdatatime,enddatatime)\r\n                    VALUES (':ownerid', ':administratorid', ':venueid', ':name', ':startdatatime', ':enddatatime')";
     $result = $db->prepare($query);
     $result->execute([':ownerid' => $model->getOwnerId(), ':administratorid' => $model->getAdministratorId(), ':id' => $model->getId(), ':venueid' => $model->getVenueId(), ':name' => $model->getName(), ':startdatatime' => $model->getStartDateTime(), ':enddatatime' => $model->getEndDateTime()]);
     $model->setId((int) $db->lastId());
 }