-Igor
On 11/2/05, Phil Kulak <[EMAIL PROTECTED]> wrote:
But you can't load the object every time, you have to keep it around
in memory between requests. Right now I do load it on each request,
but it's proxied.
So here's what I'm seeing:
-Use maps, then transfer to the domain models.
-Load the object once, then hold on to it so that the session expires
and it can't be automatically merged.
-Load and detatch the object on every request, but make sure it's unproxied.
-Clone the object at some point so that you can revert if needed.
The first one makes a lot of lines, and gets tricky in a repeating
view. The second one keeps data around between requests and the third
one doesn't give you access to lazy collections. The last one... I
don't even know how I'd go about doing that, and I have a feeling that
Hibernate would get lost and update anyway.
I think I'm going to give the second or third option a go. You
shouldn't have to rely on lazy loading collections anyway (or so the
Hibernate guys tell me :)). Thanks for helping me brainstorm, guys!
On 11/2/05, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
> Yeah, that's probably the nicest solution. You have to reload your
> object every request though, otherwise you'll have your dirty object
> still. But that's a good idea with Hibernate objects anyway,
> especially when they have lazy relations.
>
> Eelco
>
>
> On 11/2/05, Igor Vaynberg <[EMAIL PROTECTED]> wrote:
> > in a current project i have to do the validation in the service layer, so i
> > had the same problem. i use detached objects, and session.merge(). its a
> > very clean solution and works great so far.
> >
> > basic idea is: when creating an edit page load the object from database and
> > set it as form model. when the form is submitted - the loaded object becomes
> > detached because its session was closed when the prev request was done. let
> > the form bean the changes. call the service validate method - if everything
> > is OK - call the service merge method which uses session.merge to save the
> > changes.
> >
> > checkout wicket-phonebook - it also works like that bar the validation.
> >
> > -Igor
> >
> >
> > On 11/2/05, Phil Kulak <[EMAIL PROTECTED]> wrote:
> > > I know we've talked about this before, but now I need to do it and I
> > > have no clue. The easiest thing, of course, would be to just let the
> > > models get updated, do my validation, and report any errors back to
> > > the user. The problem is that if I let the models get changed, then
> > > Hibernate get's all excited and automatically updates the database at
> > > the end of the request. Has anyone hit this problem before?
> > >
> > >
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