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Architecting the Data Layer with EF in the Enterprise

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Julie Lerman
Julie Lerman
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EF in the Enterprise: Architecting the Data Layer Julie Lerman thedatafarm.com @julielerman Boston Code Camp March 2013
Julie Lerman consultant/mentor Microsoft MVP, INETA Speaker, ASPInsider, MCP, VTdotNET Leader contact jlerman@theDataFarm.com www.thedatafarm.com blog theDataFarm.com/blog twitter @julielerman Julie Lerman, Boston Code Camp March 2013 book web site LearnEntityFramework.com
My (best laid) plan Where EF fits into your architecture Repository Pattern(s) Benefits of a Unit of Work Bounded DbContext for small models Unit Testing with Entity Framework Julie Lerman, Boston Code Camp March 2013
Demo Ware Julie Lerman, Boston Code Camp March 2013
UI Logic LINQ Database Julie Lerman, Boston Code Camp March 2013
Separation of Concerns Extensible Adaptable Sensible Testable Maintainable Julie Lerman, Boston Code Camp March 2013
UI Service Layer Bus Layer Tests Repository/Unit of Work LINQ Tests Data Layer EF Database Julie Lerman, Boston Code Camp March 2013
Considering the domain Typical Model/DbContext Julie Lerman, Boston Code Camp March 2013
“bounded context” Delimits the applicability of a particular model. BOUNDING CONTEXTS gives team members a clear and shared understanding of what has to be consistent and what can develop independently. Julie Lerman, Boston Code Camp March 2013
Focused DbContexts Julie Lerman, Boston Code Camp March 2013 DB DB
Focused DbContext Julie Lerman, Boston Code Camp March 2013 DB DB
Repository Essential: Encapsulate Redundant Data Access Code Julie Lerman, Boston Code Camp March 2013
UI Service Layer Bus Layer Tests Repository/Unit of Work LINQ Tests Data Layer EF Database Julie Lerman, Boston Code Camp March 2013
Basic Repository Get Remove Store Send Julie Lerman, Boston Code Camp March 2013 to DB
Many variations… One repo One repo per per type? object graph? Read repos? Write One repo repos? per context? Julie Lerman, Boston Code Camp March 2013
Get Get Re move Store Remove Store Send to DB Send to DB Get Customer Rem Store Aggregate Orders ove Root Send to DB Julie Lerman, Boston Code Camp March 2013 Addresses
Testing with EF in the Mix Integration/ •EF only or Database? Interaction •Using database: Tests DropCreateDatabaseAlways •No EF involved: Inconsequential Unit Tests •EF in the way: Abstraction/Interfaces Julie Lerman, Boston Code Camp March 2013
Testability Classes System.Data Fake .Entity DbSet Fake Fake Context & DataA Metadata & Context & Data B DbContexts Tests Julie Lerman, Boston Code Camp March 2013 Unit of Work UI
Julie Lerman consultant/mentor Microsoft MVP, INETA Speaker, ASPInsider, MCP, VTdotNET Leader contact jlerman@theDataFarm.com www.thedatafarm.com blog theDataFarm.com/blog twitter @julielerman Julie Lerman, Boston Code Camp March 2013 book web site LearnEntityFramework.com
Julie Lerman, Boston Code Camp March 2013
Resources  Pluralsight On-Demand Training: pluralsight.com  MSDN Developer Center: msdn.com/data/ef  EF Team: blogs.msdn.com/adonet  LearnEntityFramework.com  Programming Entity Framework: DbContext  by Julie Lerman and Rowan Miller, O’Reilly Media, Feb 22 2012  Domain Driven Design  By Eric Evans, Addison-Wesley, 2004  http://domaindrivendesign.org/  “Implementing Domain Driven Design”, Vaughn Vernon, 2013  Separation of Concerns Julie Lerman, Boston Code Camp March 2013

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Architecting the Data Layer with EF in the Enterprise

  • 1. EF in the Enterprise: Architecting the Data Layer Julie Lerman thedatafarm.com @julielerman Boston Code Camp March 2013
  • 2. Julie Lerman consultant/mentor Microsoft MVP, INETA Speaker, ASPInsider, MCP, VTdotNET Leader contact jlerman@theDataFarm.com www.thedatafarm.com blog theDataFarm.com/blog twitter @julielerman Julie Lerman, Boston Code Camp March 2013 book web site LearnEntityFramework.com
  • 3. My (best laid) plan Where EF fits into your architecture Repository Pattern(s) Benefits of a Unit of Work Bounded DbContext for small models Unit Testing with Entity Framework Julie Lerman, Boston Code Camp March 2013
  • 4. Demo Ware Julie Lerman, Boston Code Camp March 2013
  • 5. UI Logic LINQ Database Julie Lerman, Boston Code Camp March 2013
  • 6. Separation of Concerns Extensible Adaptable Sensible Testable Maintainable Julie Lerman, Boston Code Camp March 2013
  • 7. UI Service Layer Bus Layer Tests Repository/Unit of Work LINQ Tests Data Layer EF Database Julie Lerman, Boston Code Camp March 2013
  • 8. Considering the domain Typical Model/DbContext Julie Lerman, Boston Code Camp March 2013
  • 9. “bounded context” Delimits the applicability of a particular model. BOUNDING CONTEXTS gives team members a clear and shared understanding of what has to be consistent and what can develop independently. Julie Lerman, Boston Code Camp March 2013
  • 10.
  • 11. Focused DbContexts Julie Lerman, Boston Code Camp March 2013 DB DB
  • 12. Focused DbContext Julie Lerman, Boston Code Camp March 2013 DB DB
  • 13. Repository Essential: Encapsulate Redundant Data Access Code Julie Lerman, Boston Code Camp March 2013
  • 14. UI Service Layer Bus Layer Tests Repository/Unit of Work LINQ Tests Data Layer EF Database Julie Lerman, Boston Code Camp March 2013
  • 15. Basic Repository Get Remove Store Send Julie Lerman, Boston Code Camp March 2013 to DB
  • 16. Many variations… One repo One repo per per type? object graph? Read repos? Write One repo repos? per context? Julie Lerman, Boston Code Camp March 2013
  • 17. Get Get Re move Store Remove Store Send to DB Send to DB Get Customer Rem Store Aggregate Orders ove Root Send to DB Julie Lerman, Boston Code Camp March 2013 Addresses
  • 18. Testing with EF in the Mix Integration/ •EF only or Database? Interaction •Using database: Tests DropCreateDatabaseAlways •No EF involved: Inconsequential Unit Tests •EF in the way: Abstraction/Interfaces Julie Lerman, Boston Code Camp March 2013
  • 19. Testability Classes System.Data Fake .Entity DbSet Fake Fake Context & DataA Metadata & Context & Data B DbContexts Tests Julie Lerman, Boston Code Camp March 2013 Unit of Work UI
  • 20. Julie Lerman consultant/mentor Microsoft MVP, INETA Speaker, ASPInsider, MCP, VTdotNET Leader contact jlerman@theDataFarm.com www.thedatafarm.com blog theDataFarm.com/blog twitter @julielerman Julie Lerman, Boston Code Camp March 2013 book web site LearnEntityFramework.com
  • 21. Julie Lerman, Boston Code Camp March 2013
  • 22. Resources  Pluralsight On-Demand Training: pluralsight.com  MSDN Developer Center: msdn.com/data/ef  EF Team: blogs.msdn.com/adonet  LearnEntityFramework.com  Programming Entity Framework: DbContext  by Julie Lerman and Rowan Miller, O’Reilly Media, Feb 22 2012  Domain Driven Design  By Eric Evans, Addison-Wesley, 2004  http://domaindrivendesign.org/  “Implementing Domain Driven Design”, Vaughn Vernon, 2013  Separation of Concerns Julie Lerman, Boston Code Camp March 2013