DBServer::IsExists PHP Method

    public static function IsExists($serverId)
    {
        $db = \Scalr::getDb();
        return (bool) $db->GetOne("SELECT id FROM servers WHERE server_id=? LIMIT 1", array($serverId));
    }

 public function xListTasksAction()
 {
     $this->request->defineParams(array('bundleTaskId' => array('type' => 'int'), 'sort' => array('type' => 'json', 'default' => array('property' => 'id', 'direction' => 'DESC'))));
     $sql = "SELECT * FROM bundle_tasks WHERE env_id = ?";
     $args = array($this->getEnvironmentId());
     if ($this->getParam('id') > 0) {
         $sql .= " AND id = ?";
         $args[] = $this->getParam('bundleTaskId');
     }
     $response = $this->buildResponseFromSql2($sql, array('id', 'server_id', 'rolename', 'status', 'os_family', 'dtadded', 'dtstarted', 'created_by_email'), array(), $args);
     foreach ($response["data"] as &$row) {
         $row['server_exists'] = DBServer::IsExists($row['server_id']);
         $row['dtadded'] = Scalr_Util_DateTime::convertTz($row['dtadded']);
         if (!$row['bundle_type']) {
             $row['bundle_type'] = "*";
         }
         if ($row['dtfinished'] && $row['dtstarted']) {
             $row['duration'] = Scalr_Util_DateTime::getDateTimeDiff($row['dtfinished'], $row['dtstarted']);
         }
         if ($row['dtfinished']) {
             $row['dtfinished'] = Scalr_Util_DateTime::convertTz($row['dtfinished']);
         }
         if ($row['dtstarted']) {
             $row['dtstarted'] = Scalr_Util_DateTime::convertTz($row['dtstarted']);
         }
     }
     $this->response->data($response);
 }