记在thinkPHP中一个创建模型的小错误

class ManagerModel {
//put your code here
function checkDenglu($name,$pwd){
$info=$this->getByMg_name($name);
show($info);
}
}

class ManagerModel extends Model{
//put your code here
function checkDenglu($name,$pwd){
$info=$this->getByMg_name($name);
show($info);
}
}