public function doExecute()
 {
     $username = $this->request->getProperty("username");
     $password = $this->request->getProperty("password");
     if ($username == null) {
         throw new Exception("you must supply username paramater");
     }
     if ($password == null) {
         throw new Exception("you must supply a password paramater");
     }
     echo "\n\nUPGRADE DATABASE \n\n";
     echo "  Executing KB upgrade . . . ";
     $data = new Xerxes_DataMap(null, $username, $password);
     $data->upgradeKB();
     echo "done!\n";
 }