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It's been a while, but I enjoyed using Castor before other approaches became so widely adopted in the Java world. Does it seem conceptually similar at least?

http://castor.codehaus.org

From the very little I read of the documentation, it seems like a similar concept -- mapping the objects to the data is done outside of the objects.

Actually Doctrine is Hibernate implemented in php http://hibernate.org/orm/

Interesting, thanks. I had heard of Hibernate before but never actually looked into it. I can definitely see the similarities - especially between Doctrine's DQL and Hibernate's HQL.

SQLAlchemy also does this. Which is appropriate, since "ORM" implies that on some level you're mapping existing relations to existing objects.