What exactly is “persistence ignorance”?

Question

Persistence ignorance is typically defined as the ability to persist & retrieve standard .NET objects (or POCOs if you really insist on giving them a name). And a seemin

Answer 1

I agree with Mikeb - "persistance ignorance" is a sliding scale, not a true/false property of a given ORM.

My definition of true 100% PI would be that you could persist ANY possible POCO class, no matter how convoluted and linked to other classes, without otherwise changing the class in any way.

Adding ID fields, decorating with attributes, inheriting from ORM classes, having to design your classes so they map well to the underlying tables in an RDB - all reduce the "PI score" below 100%.

This said, I've chosen to use Fluent NHibernate Automapping because it seems to have the highest PI score of any of the ORM options I've looked at.