public function containsURLs()
  {
    PHPCrawlerBenchmark::start("checking_for_urls_in_cache");
    
    $Result = $this->PDO->query("SELECT id FROM urls WHERE processed = 0 OR in_process = 1 LIMIT 1;");
    
    $has_columns = $Result->fetchColumn();
    
    $Result->closeCursor();
    
    PHPCrawlerBenchmark::stop("checking_for_urls_in_cache");
    
    if ($has_columns != false)
    {
      return true;
    }
    else return false;
  }