protected function createConfig($appId, $key, $value)
 {
     $query = $this->connection->getQueryBuilder();
     $query->insert('appconfig')->values(['appid' => $query->createNamedParameter($appId), 'configkey' => $query->createNamedParameter((string) $key), 'configvalue' => $query->createNamedParameter((string) $value)])->execute();
 }