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recommendation is that you carefully examine whether a schema change is possible. In our experience, many developers immediately dismiss database schema changes as too complex and time consuming, and they look for an NHibernate solution. Sometimes this opinion isn t justified, and we urge you to consider schema evolution as a natural part of your data s lifecycle. If making table changes and exporting/importing data solves the problem, one day of work may save you many days in the long run when workarounds and special cases become a burden. Now that you re finished developing and mapping the data side of the domain model, it s time to dig into its behavior: specifically, how much it s supposed to know about persistence.

In the description of the layers of an NHibernate application (section 8.1.3), we highlighted the fact that the domain model shouldn t depend on any other layer or service (although this isn t a strict rule). This is important because it influences its portability; the less coupling an entity has, the easier it is to modify, test, and reuse. This recommendation leads to the notion of persistence ignorance (PI). A persistence-ignorant entity has no knowledge of the way it s persisted (it doesn t even know that it can be persisted). Practically speaking, the entity doesn t have methods like Save() or static (factory) methods like Load(), and it doesn t have any reference to the persistence layer. This is already the case for the entities you ve been writing in this book. Going one step further, we can also say that entities shouldn t have Identifier and Version properties. The argument is that primary keys and optimistic control have nothing to do with the business domain, and therefore don t belong in the domain model. We usually wouldn t go this far; the convenience of having these properties far outweighs the slight pollution of the domain model they introduce. Note that PI isn t a requirement for all solutions, and you may find it easier to develop solutions without it. However, we do consider PI a good thing to strive for as it creates a less coupled, more testable and maintainable domain model. It s particularly useful when the domain model explicitly requires portability and flexibility. Now let s see how you can implement an entity that is as free as possible of persistence-related code while still being functional and simple.

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A common compromise, at the level of persistence awareness, is to separate persistence-related code from the business code in the implementation of an entity. This can be as trivial as performing a visual separation using a #region in your code, to help improve readability. Another option is to create an abstract base class for each entity so that persistent code is separated. Let s look at how you can implement the latter solution. You ll use NHibernate. Mapping.Attributes because it lets the base class abstract the mapping information along with the code. You ll see that the end result can be acceptable as long as you

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