public static function ExecuteQuery($query, $externalDBCredentials)
 {
     $dbHandler = ExternalDBs::GetDBHandler($externalDBCredentials);
     return $dbHandler->ExecuteQuery($query);
 }
 public function GetTotalNumberTuplesInTableBySidAndNameFromExternalDB($sid, $table_name)
 {
     $externalDBCredentials = $this->GetExternalDBCredentialsBySid($sid);
     //TODO: implement
     return ExternalDBs::GetTotalNumberTuplesInTableBySidAndName($table_name, $externalDBCredentials);
 }