/**
  * get id by email
  * @param string $email
  * @return null|int id
  */
 public function getIdByEmail($email)
 {
     //sql check
     $email = $this->connection->getEscapedString($email);
     //get id and return
     return $this->operations->getValue("id", "email = '{$email}'");
 }
 /**
  * Stores a given notification in the provided db
  *
  * @param ClientNotification $notification A notification to be store in the specified db
  * @return int the id of notification inserted
  * @throws DatabaseException If an error occured in the storing of the notification in the db
  */
 public function store(ClientNotification $notification)
 {
     //String conversion and escaping in order to perform a correct and safe sql query
     $user_id = $notification->getUserId();
     $message = $this->dbConnection->getEscapedString((string) $notification->getMessage());
     $mediums = $notification->getNotificationMediums();
     try {
         //Notification insert
         $this->dbOperations->insert('user_id,message', $user_id . ",'" . $message . "'");
         //Id of the record just inserted
         $recordId = $this->dbOperations->getLastId();
         if (is_array($mediums)) {
             foreach ($mediums as $medium) {
                 //TODO this code doesn't work, use the code in the 'else' branch. Since the code will become the same it's a better choice to insert it into a method
                 $this->dbOperations->insert('notification_id,type_id', $recordId . ", '" . get_class($medium) . "'", $this->notificationTypeTable);
             }
         } else {
             $className = get_class($mediums);
             $queryResult = $this->dbOperations->getValue('id', 'name = ' . "'" . $className . "'", $this->typesTable);
             if (is_null($queryResult)) {
                 $this->dbOperations->insert('name', "'" . $className . "'", $this->typesTable);
                 $queryResult = $this->dbOperations->getLastId();
             }
             $this->dbOperations->insert('notification_id,type_id', $recordId . ", " . $queryResult, $this->notificationTypeTable);
         }
         return $recordId;
     } catch (MysqltcsException $e) {
         throw new DatabaseException('An error occurred in the insertion of the data in the database', 0, $e);
     }
 }