[hibernate-dev] [OGM] RowKey vs. EntityKey

[Gunnar Morling]

2013/11/11 Emmanuel Bernard <emmanuel at hibernate.org>

> As we discussed on Irc but for posterity.
>
> EntityKey represents what you need to reach an entity. It contains both
> the actual id information and the metadata necessary to do the query.
> Likewise, we have AssociationKey that does represent an association
> navigation.
> RowKey is used to represent two things:
> - each entry key  in an association navigation (which is conceptually a
> map)
> - the unique identifier to reach a sequence or a table generator entry
>

Thanks for the clarification, much appreciated.

I tend to like the fact that these are typed differently so in a way I'd
> split the RowKey in two more than merge everything together. If anything it
> makes is easier for a GridDialect writer to understand what's going on.
> Davide pointed out that a common super interface might be useful in a
> couple of places.
>

Yes, that would make sense. I think this was what I actually meant to ask,
it just wasn't clear to me when writing the original question :)

Emmanuel
>
> On 8 nov. 2013, at 13:20, Gunnar Morling wrote:
>
> > Hi,
> >
> > This may be a noob question, but what is the difference between RowKey
> and
> > EntityKey in OGM?
> >
> > Both seem to represent one row (by means of table name + key column
> names +
> > column values), albeit being implemented a bit differently. Could they be
> > merged into one class?
> >
> > Thanks,
> >
> > --Gunnar
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>