Rose::DB::Object 介绍
Rose::DB::Object 是一个Perl语言的数据库对象映射框架
示例代码：
$product = Product->new(id => 123,
name => 'GameCube',
status => 'active',
start_date => '11/5/2001',
end_date => '12/1/2007',
category_id => 5);
$product->save;
...
$product = Product->new(id => 123);
$product->load;
# Load foreign object via "one to one" relationship
print $product->category->name;
$product->end_date->add(days => 45);
$product->save;
...
$product = Product->new(id => 456);
$product->load;
# Load foreign objects via "one to many" relationship
print join ' ', $product->prices;