because NH will try to delay access to DB as late as possible.

2010/1/6 Shane C <[email protected]>

> I did some experimenting tonight and found that given...
>
> Customer
>  has many Orders
>   has many OrderedItems
>
> If I...
>
> var customer = new Customer();
>
> var order = customer.CreateNewOrder();
>
> var orderedItem = order.Add(product, QUANTITY_OF_ONE);
>
> session.SaveOrUpdate(customer);
>
> Then everyone will get an Id that I can immediately read right after
> the SaveOrUpdate.  If instead I...
>
>
> var customer = new Customer();
>
> session.Save(customer);
>
> var order = customer.CreateNewOrder();
>
> var orderedItem = order.Add(product, QUANTITY_OF_ONE);
>
> session.SaveOrUpdate(customer);
>
> Then the customer and the order get an Id after the 2nd SaveOrUpdate.
> I have to either session.Flush() OR session.Persist(orderedItem) if I
> want the orderedItem to get an Id.
>
> This matches up with what I noticed today at work but I'm not sure I
> understand it from a consistency point of view.  Why does saving an
> entity mean that the child entities no longer get an id immediately?
>
>
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-- 
Fabio Maulo
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