public static function getCityDistricts($cityId)
{
$key = Util_MemCacheKey::getCityDistrictsKey($cityId);
$memcache = APF_Cache_Factory::get_instance()->get_memcache();
$info = $memcache->get($key);
if ($info === false) {
$info = self::data_access()->filter(self::CITY_ID, $cityId)->filter(self::IS_ACTIVED, 1)->sort(self::DISPLAY_ORDER, 'asc')->get_all();
$memcache->set($key, $info, 0, 86400);
}
return $info;
}
