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

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;
> }






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