public static function write($id, $data)
 {
     if (is_null(self::$context)) {
         self::initialize();
     }
     if (strlen($id) < 32) {
         return false;
     }
     $userid = Acl::getIdentity('textcube');
     if (empty($userid)) {
         $userid = Acl::getIdentity('openid') ? SESSION_OPENID_USERID : '';
     }
     if (empty($userid)) {
         $userid = 'null';
     }
     $data = POD::escapeString($data);
     $server = POD::escapeString($_SERVER['HTTP_HOST']);
     $request = POD::escapeString(substr($_SERVER['REQUEST_URI'], 0, 255));
     $referer = isset($_SERVER['HTTP_REFERER']) ? POD::escapeString(substr($_SERVER['HTTP_REFERER'], 0, 255)) : '';
     $timer = Timer::getMicroTime() - self::$sessionMicrotime;
     $current = Timestamp::getUNIXtime();
     $result = self::query('count', "UPDATE " . self::$context->getProperty('database.prefix') . "Sessions \n\t\t\t\tSET userid = {$userid}, privilege = '{$data}', server = '{$server}', request = '{$request}', referer = '{$referer}', timer = {$timer}, updated = " . $current . " \n\t\t\t\tWHERE id = '{$id}' AND address = '{$_SERVER['REMOTE_ADDR']}'");
     if ($result && $result == 1) {
         @POD::commit();
         return true;
     }
     return false;
 }