So we'd need a value mapper, which users can define, to map fields to columns.  Possibly handle relationships, aggregate objects.  Maybe even make things easy by providing annotations so users can just annotate their value objects.

So this value mapper would effectively be reinventing JPA?  ;-) 

Is there such a thing as JPA for Cassandra?  Or an equivalent (of not specific to the JPA spec)?

On 3 Dec 2010, at 10:40, Tristan Tarrant wrote:

Exactly.
Obviously in the case of a JPA cache store, the V would be an @Entity and therefore "automapped" by the persistence provider. For Cassandra this would have to be explicitly processed by a Value to Store mapper (which could come useful also with the plain JDBC store).

Tristan

On Fri, Dec 3, 2010 at 11:33, Manik Surtani <manik@jboss.org> wrote:

Tristan,

We do have an open JIRA for a JPA cache store over a RDBMS, which would map entities on to columns.  Are you suggesting something similar?

Cheers
Manik

On 3 Dec 2010, at 07:58, Tristan Tarrant wrote:

> Dear all,
>
> after adding the key mapping functionality to the Cassandra cache store, I was thinking that it would be nice to have a similar feature for mapping values to Cassandra's columns and column families (I don't know if these concepts are familiar to you, but they roughly translate to columns in a relational database). This means that instead of putting a binary blob into the store, the data would be mapped in a more natural format. This could also come in useful for the JDBC store.
> This would obviously be done as part of 5.x.
>
> Ideas & suggestions ?
>
> Tristan
>

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Manik Surtani
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