EF + DDD = true? by Jimmy Nilsson. About Jimmy Nilsson Primarily a developer and architect, but also a trainer and author Blog: JimmyNilsson.com/blog/

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Presentation transcript:

EF + DDD = true? by Jimmy Nilsson

About Jimmy Nilsson Primarily a developer and architect, but also a trainer and author Blog: JimmyNilsson.com/blog/ Twitter: twitter.com/JimmyNilsson Author of ”Applying Domain-Driven Design and Patterns” and ”.NET Enterprise Design” Co-founder and CEO of factor10

Relational database? O/RM or ”manual”? EF or NHibernate? EF 3.5, how to prepare for 4? DDD and TDD! ?

Relational database? O/RM or ”manual”? EF or NHibernate? EF 3.5, how to prepare for 4? DDD and TDD! :-)

Why TDD? TDD isn’t about testing......it’s about programming! To write simpler, clearer and more robust and maintainable code!

Why DDD? Accidental complexity is bad ”Programming is understanding” (Kristen Nygaard) ”DDD == OO done right” Context is king Semantics over technology...

But also with TDD and DDD we most often need to persist data It’s just not the main focus... Assume that we might use a relational database EF? EF3.5 DB-first (generate metadata and classes) IPoco EF4 DB-first (generate metadata and classes) Model-first (”paint” metadata, generate DB and classes) Code-first (”generate” metadata in runtime, generate DB)

Disclaimer Not a review! No production experience... No analysis...

Our story can begin... Domain expert: Lotta Who needs a new app... TimeReport! Developer: Jimmy

Time report

”- Show me the code!”

Recommendation Frameworks come and go, good design lasts! So... Focus on DDD and TDD!

References [DDD] Eric Evans: Domain-Driven Design [ADDDP] Jimmy Nilsson: Applying Domain-Driven Design and Patterns