Kohana example of config in the database

bootstrap.php

Kohana::$config->attach(new Config_Database);

config.sql

CREATE TABLE IF NOT EXISTS `config` (
  `group_name` varchar(100) NOT NULL,
  `config_key` varchar(100) NOT NULL,
  `config_value` text,
  UNIQUE KEY `group_name_config_key` (`group_name`,`config_key`),
  KEY `config_key` (`config_key`)
);

usage.php

Kohana::$config->load('site.last_updated')

Kohana::$config->load('site')->set('last_updated', '2013-07-12');