public static function readone($instance)
{
$db_key = $instance->get_db_key();
$table_name = $instance->get_table();
$key = $instance->get_memcache_key();
$Lib_Memory = Lib_Memory::get_instance();
if (!$Lib_Memory->exist($key)) {
$t = new self();
$t->set_db_key($db_key);
$t->set_table($table_name);
$t->id = $instance->get_id();
$t->init_first2($key, $instance->get_id());
$Lib_Memory->add($key, $t, false);
}
return $Lib_Memory->find($key);
}