The merge can work with cascade (depending on mapping)
2009/10/30 Mohamed Meligy <[email protected]>
> There is a mistake in the above code. I think it's easy guessable but to
> avoid confusion here is the corrected part:
>
> if(NHibernateUtil.IsInitialized(cart) == false)
> {
> NHibernateUtil.Initialize(cart);
> }
>
> the part [[ == false ]] was missed in the emailed version.
>
> Thoughts ?
>
>
>
>
>
> Regards,
>
> --
> Mohamed Meligy
> Information Analyst (.Net Technologies) – Applications Delivery - TDG
> Injazat Data Systems
> P.O. Box: 8230 Abu Dhabi, UAE.
>
> Phone: +971 2 6992700
> Direct: +971 2 4045385
> Mobile: +971 50 2623624, +971 55 2017 621
>
> E-mail: [email protected]
> Weblog: http://weblogs.asp.net/meligy
>
>
> On Fri, Oct 30, 2009 at 10:25 AM, Mohamed Meligy <[email protected]>wrote:
>
>> Session.Merge(..) did the trick for me. Very nice!!
>>
>> In a related question:
>> Now if I want to intialie lets's say ShoppingCart.Items and rotate on them
>> in other web requetses, you'd get an exception that the Proxy for each
>> ShoppingcartItem is not intiailized because there is no session (because the
>> session was closed by end of the first web request).
>> Now, I have a similar scenario to this, and I work around it by writing
>> some code similar to this (adapted to the given example of ShoppingCart):
>>
>> public static ShoppingCart UserShoppingCart
>> {
>> get
>> {
>> var cart = Context.Session[SessionShoppingCartKey] as
>> ShoppingCart
>> if(cart == null)
>> {
>> Context.Session[SessionShoppingCartKey] =
>> cart = new
>> ShoppingCartService().FindShoppingCartSomeHow(..../*whatever
>> criteria*/....);
>> }
>>
>> if(NHibernateUtil.IsInitialized(cart))
>> {
>> NHibernateUtil.Initialize(cart);
>> }
>>
>> return cart;
>> }
>> }
>>
>>
>> *Of course in real code I encapsulate the use of NHibernateUtil (just
>> making it fit simple ShoppingCart sample), but I still want to know in
>> general, Is this a good approach to do it ???*
>>
>> You mentioned there are other ways to manage this situation without using
>> SessionState. Actually, the example I made up of my mind when writing the
>> email to demonstrate sample use of SessionState (I real world distributed
>> e-commerce engine I was responsible for ShoppingCart as a whole Module of
>> the system in itself and distributed caching and really big story). Assume
>> another example of saving some extended logged-in user information along the
>> user session, *is there a better way tpo manage it ?*
>>
>>
>> Regards,
>>
>> --
>> Mohamed Meligy
>> Information Analyst (.Net Technologies) – Applications Delivery - TDG
>> Injazat Data Systems
>> P.O. Box: 8230 Abu Dhabi, UAE.
>>
>> Phone: +971 2 6992700
>> Direct: +971 2 4045385
>> Mobile: +971 50 2623624, +971 55 2017 621
>>
>> E-mail: [email protected]
>> Weblog: http://weblogs.asp.net/meligy
>>
>>
>> On Fri, Oct 30, 2009 at 9:53 AM, Fabio Maulo <[email protected]>wrote:
>>
>>> session.Lock or Merge; Merge if the entity was saved in some moment.
>>> btw there are some other options to manage that situation without use
>>> HttpSession
>>>
>>> 2009/10/29 Mohamed Meligy <[email protected]>
>>>
>>> This mostly applies to web applications.
>>>> Let's say I have an object "ShoppingCart" that is persisted both in HTTP
>>>> SessionState and Database for some reason (let's say we want the user to
>>>> find the cart available if he leaves the site and comes back later). Every
>>>> time the user adds a "Product" to the "ShoppingCart", we want to add it to
>>>> the "SessionState" already laoded in HTTP SessionState and then we save
>>>> the
>>>> "ShoppingCart" i dataabase.
>>>>
>>>> *We want to avoid loading the "ShoppingCart" from the database when we
>>>> want to change some proprty or add some related object when we already have
>>>> it loaded in HTTP SessionState,* but we are also using the typical
>>>> "Single NHibernate ISession per HTTP Request" pattern, meaning the
>>>> "ShoppingCart" is loaded from one NH ISession and changed in other
>>>> different
>>>> NH ISessions (since saved in HTTP SessionState, which is maintained across
>>>> multiple HTTP Requests).
>>>> *Will it be possible to have the object loaded from different NH
>>>> ISession to be saved usig another ISession?*
>>>>
>>>> In Linq To Sql and Entity Framework you can theoretically Detach ad
>>>> Re-Attach entity to different Data/Entity Context. I LLBLGen (Adapter not
>>>> Self Servcing, cause the latter is just ACtiveRecord) the entity is
>>>> generated with all required Proxy functionality that makes it self tracking
>>>> making it easy to use without attaching to cetain Adapter.
>>>> How about in NHibernate?
>>>>
>>>> Regards,
>>>>
>>>> --
>>>> Mohamed Meligy
>>>> Information Analyst (.Net Technologies) – Applications Delivery - TDG
>>>> Injazat Data Systems
>>>> P.O. Box: 8230 Abu Dhabi, UAE.
>>>>
>>>> Phone: +971 2 6992700
>>>> Direct: +971 2 4045385
>>>> Mobile: +971 50 2623624, +971 55 2017 621
>>>>
>>>> E-mail: [email protected]
>>>> Weblog: http://weblogs.asp.net/meligy
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Fabio Maulo
>>>
>>>
>>>
>>
>
> >
>
--
Fabio Maulo
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