Update and Merge, both do this, Merge works even if you have this item in the session and in this case it merges the disconnected item with the item in the session, it was called SaveOrUpdateCopy in the past (IIRC).
Gustavo. On Mon, Apr 6, 2009 at 8:27 PM, graphicsxp <[email protected]>wrote: > > I really don't get this Merge thing. I've got the book NHibernate in > Action, and there's no mention of it, neither is there a mention of it > in my Nhibernate doc. > > Besides I'm using Spring.net (I know it is a bit off topic) and their > HibernateTemplate does not seem to provide a Merge function. > > What does it do exactly ? Since I re-open a new session on the server > side when the client saves an entity, I think I need something to get > the entity again from the database in order to compare it with the > changes the client made, isnt that right ? > > On 6 avr, 17:50, Fabio Maulo <[email protected]> wrote: > > Merge > > > > 2009/4/6 graphicsxp <[email protected]> > > > > > > > > > > > > > If I use Update(), NH does a UPDATE query (regardless my entity was > > > modified or not) but doesn't persist or delete the items in the > > > collection... > > > > > On 6 avr, 17:28, Fabio Maulo <[email protected]> wrote: > > > > The method to reattach the entity to a new session is wrong.You > should > > > use > > > > Update or Merge. > > > > > > 2009/4/6 graphicsxp <[email protected]> > > > > > > > Hello, > > > > > > > I still don't get it. Roger you gave me a link to hibernate doc, > but > > > > > this is nhibernate and I can't find any references to .Merge() in > the > > > > > nhibernate doc. > > > > > > > Here's what I do and what I need ; > > > > > > > Open Session > > > > > Get entity > > > > > Close Session > > > > > Send entity to client > > > > > Client modifies entity > > > > > Client sends entity to server > > > > > Open Session > > > > > Save entity --> here's the issue because the update is made > whether > > > > > the entity was changed or not by the client > > > > > Close Session > > > > > > > another issue I've just noticed is that if my entity Post holds a > > > > > collection of Comments, if I delete some of the comments, when I do > > > > > myPost.Save(), nothing gets deleted. (I've specified cascade = > "all- > > > > > delete-orphan") > > > > > > > Can you help with this ? > > > > > > > On 3 avr, 15:12, Roger Kratz <[email protected]> wrote: > > > > > > > http://www.dil.univ-mrs.fr/~massat/docs/hibernate-3.1/api/org/hiberna<http://www.dil.univ-mrs.fr/%7Emassat/docs/hibernate-3.1/api/org/hiberna> > > > .. > > > > > .) > > > > > > > > -----Original Message----- > > > > > > From: [email protected] [mailto:[email protected]] > On > > > > > Behalf Of graphicsxp > > > > > > Sent: den 3 april 2009 16:09 > > > > > > To: nhusers > > > > > > Subject: [nhusers] Re: how to detect changes to entities > > > > > > > > SaveOrUpdate triggers an UPDATE regardless the entity has changed > or > > > > > > not. I'm not sure about session.Merge. > > > > > > > > On 3 avr, 15:00, Gustavo Ringel <[email protected]> > wrote: > > > > > > > session.SaveOrUpdate or session.Merge should be enough for this > > > case... > > > > > > > I really don't think that sending domain object through the > wire is > > > a > > > > > good > > > > > > > practice. But it works for small apps. > > > > > > > > > Gustavo. > > > > > > > > > On Fri, Apr 3, 2009 at 4:23 PM, graphicsxp < > > > [email protected] > > > > > >wrote: > > > > > > > > > > Hi, > > > > > > > > > > Normally NH is able to detect any changes made to entities > and > > > > > > > > when .save() is called, the UPDATE will be made only if the > > > entity > > > > > was > > > > > > > > changed. > > > > > > > > > > Now the issue is that I'm sending my entities across the wire > > > from > > > > > the > > > > > > > > server to the client (via WCF), the client modifies the > entity > > > (or > > > > > > > > not), clicks on a save button and the entity is sent back to > the > > > > > > > > server. How can NH detects the entity has changed since it > does > > > not > > > > > > > > belong to the same session ? > > > > > > > > > > Thanks > > > > > > -- > > > > Fabio Maulo > > > > -- > > Fabio Maulo > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nhusers?hl=en -~----------~----~----~----~------~----~------~--~---
