I saw the following under the OGM page (emphasis mine):



I'm exploring Hibernate as a candidate for a project I'm working on. We are planning to support both relational and NoSQL databases. The bolded section of the quote sounds like Hibernate does not currently support this scenario but I'm wondering if it's supported but requires different code/queries/configuration/etc for each type of database or just completely won't work for some reason or what.

If anyone can provide a bit more detail on this scenario I'd appreciate it.

Thanks

Hi,

This statement is a bit misleading, I need to improve it.

If you want to have some entities in a RDBMS and some entities in a NoSQL store and that these entities have no association between each other (in the JPA sense), then you can perfectly do that. We have a test that makes sure both Hibernate ORM and Hibernate OGM can start in the same application.
Simple add several persistence units in your persistence.xml and have one of them use Hibernate ORM and the other Hibernate OGM.
If there is a problem here, we need to fix it :)

If you want to have the same entities or entities linked with associations mixed between the rDBMS and a NoSQL store then we don't support that format yet and that will take a while I think.

I hope that clarifies things.

I have updated the FAQ http://hibernate.org/ogm/faq/#do-you-support-both-relational-and-nosql-databases

Thanks, that is exactly the clarification I was looking for.