Re: AW: [eclipselink-users] how to update entities with persisted entiti

[Leon Derks <leon.derks@xxxxxxxxxx>]

Hi Mark,

Yes I want to throw awaay all the changes, because the groups don't change.
The problem is that the imported group in the List  importGroups is not 
updated.
Only new persisted groups are updated.

How is this possible?

Leon

Mark Struberg wrote:
> Hi Leon!
>
> Is this all the code?
>
> What's confusing me:
>   
> >    if(persistedGroup != null) {
> >         importGroup = persistedGroup;
> >    }
> >     
> so you really like to throw away all the changes in your importGroup and take the version from the database? (what about merge?)
>
> LieGrü,
> strub
>
> --- Leon Derks <leon.derks@xxxxxxxxxx> schrieb am Sa, 8.11.2008:
>
>   
> > Von: Leon Derks <leon.derks@xxxxxxxxxx>
> > Betreff: [eclipselink-users] how to update entities with persisted entities
> > An: "EclipseLink User Discussions" <eclipselink-users@xxxxxxxxxxx>
> > Datum: Samstag, 8. November 2008, 19:21
> > I am seeing a behaviour which I can not explain.
> >
> > I have a list of groups (imported from an xml file)
> > Then I loop through these groups and check if they already
> > exist in de db.
> > I want them to be updated with the persisted group.
> >
> > In my debugger perspective I see that ids of new groups are
> > updated with the newly assigned id.
> > But the groups that are already in the db are not updated
> > with the persisted id.
> >
> > The makePersistent method does a persist if id == 0 or else
> > the entity is merged.
> >
> > What I want is that all importGroups are updated with
> > either the persisted id, or a newly assigned id.
> > At the moment only new groups are updated with an id.
> >
> > How is this possible?
> >
> > See below for code.
> >
> >
> > //Loop through the groups
> > List<CharacteristicGroup> importGroups =
> > importData.getCharacterisicGroups();
> > for(CharacteristicGroup importGroup : importGroups) {
> >    importGroup =
> > updateWithPersistedCharacteristicGroup(importGroup);
> > }
> >
> > private CharacteristicGroup
> > updateWithPersistedCharacteristicGroup(CharacteristicGroup
> > importGroup) {
> >    CharacteristicGroup persistedGroup =
> > characteristicGroupDAO.findGroupByExample(importGroup);
> >    if(persistedGroup != null) {
> >         importGroup = persistedGroup;
> >    }
> >    characteristicGroupDAO.makePersistent(importGroup);
> >    return importGroup;
> > }
> >     
>
>
>
>       
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
>
>
> __________ NOD32 3597 (20081108) Informatie __________
>
> Dit bericht is gecontroleerd door het NOD32 Antivirus Systeem.
> http://www.nod32.nl
>
>
>
>