我对 memcached 有疑问。
我有以下代码:
/**
* Load the char object
* @param char_id id char
* @return $char object
*/
function get_info( $char_id )
{
$cache = Cache::instance();
$cachetag = Kohana::config( 'medeur.environment' ) . '-charinfo_' . $char_id . '_obj' ;
kohana::log('debug', "-> Getting $cachetag from CACHE..." );
$char = $cache -> get( $cachetag );
if ( is_null( $char ) )
{
kohana::log('debug', "-> Getting $cachetag from DB.");
$char = ORM::factory('character', $char_id );
if ( !$char -> loaded )
$char = null;
$cache -> set( $cachetag, $char, 3600 );
}
return $char;
}
我在日志文件中看到对象 $char 是从缓存中获取的:
2012-12-08 18:24:07 +01:00 --- debug: -> Getting test-global_adminmessage from CACHE...
2012-12-08 18:24:07 +01:00 --- debug: -> Getting test-charinfo_1_obj from CACHE...
但是,我一直在分析器表中看到我仍在使用数据库:
SELECT `characters`.* FROM (`characters`) WHERE `characters`.`id` = 1 ORDER BY `characters`.`id` ASC LIMIT 0, 1
为什么?在这种情况下,memcached 就没用了……