public function setCredentials($writerId, $credentials)
 {
     $bucketId = $this->getSysBucketId($writerId);
     if (!isset($credentials['driver']) || empty($credentials['driver'])) {
         $credentials['driver'] = 'mysql';
     }
     foreach (array_keys($credentials) as $key) {
         $secret = false;
         if ($key == 'password') {
             $secret = true;
         }
         $this->storageApi->setBucketAttribute($bucketId, 'db.' . $key, $credentials[$key], $secret);
     }
 }