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

you can implement persisrtence ignorance using a class for the domain or you application and a POCO class in the persistence, when you are going to persist the domain object map it into your persistence class and use the persistence object to store with nhibernate o other framework

your domain class must to ignore how is persisted the information, so you must no include any rules of a persistence framework like (empty constructor, virtual properties etc.)

these persistence framework rules can be in your persistence class.

Answer 2

While there may be certain minor constraints that any given persistence-ignorance framework requires, persistence-ignorance nevertheless remains in place.

While a class in your domain model (transparently persisted with NHibernate) must have a no-arguments constructor so that it can be constructed "dynamically," it is not required to have a certain base class dictated by the framework nor is it required to have or override certain framework-specified methods.