Kohana中memcache用法读写

	function action_a()
	{
		$memcache = Cache::instance('memcache');
		$memcache = Cache::instance();
		$memcache->set('vv', 'This is vv data!!');	
		$v = Cache::instance()->get('vv');
		echo('--[['.$v.']]---123');			
	}