public function StudList($groupid)
{
$groupid = intval($groupid);
if (isset($this->_cache['StudList'][$groupid])) {
return $this->_cache['StudList'][$groupid];
}
$list = $this->models->InstanceClass('StudList');
$rows = RecordBookQuery::StudList($this->db, $groupid);
while ($d = $this->db->fetch_array($rows)) {
$list->Add($this->models->InstanceClass('StudItem', $d));
}
return $this->_cache['StudList'][$groupid] = $list;
}