![Domain – Data Layer check-mate
SELECT
[Extent2].[ID] AS [ID],
[Extent2].[DealID] AS [DealID],
[Extent2].[ScenarioNumber] AS [ScenarioNumber],
[Extent2].[ServiceCodeID] AS [ServiceCodeID],
[Extent2].[CountryCode] AS [CountryCode],
[Extent2].[CurrencyCode] AS [CurrencyCode],
[Extent2].[PriceListID] AS [PriceListID],
[Extent2].[BranchID] AS [BranchID],
[Extent2].[ExchangeRate] AS [ExchangeRate],
[Extent2].[Volume] AS [Volume],
[Extent2].[ActualPrice] AS [ActualPrice],
[Extent2].[CurrentPrice] AS [CurrentPrice],
[Extent2].[StandardPrice] AS [StandardPrice],
[Extent2].[MinVol] AS [MinVol],
[Extent2].[MaxVol] AS [MaxVol],
FROM [Treasury].[Deal] AS [Extent1]
INNER JOIN [Treasury].[DealActivity] AS [Extent2] ON [Extent1].[DealID] = [Extent2].[DealID]
WHERE [Extent1].[RegionID] IN (5,1,6,4,2)](https://image.slidesharecdn.com/acleanrepositorypatterninef-120728100256-phpapp02/85/A-clean-repository-pattern-in-ef-19-320.jpg)
A clean repository pattern in ef
- 1. A Clean Repository Pattern In EF Via Interfaces By Brandon D’Imperio Imaginarydevelopment.blogspot.com
- 2. What’s wrong? Typical dependency structure
- 3. What’s wrong? We want to move to Azure Typical dependency structure We want to add a thick client against ADO for our existing web to Azure.
- 4. What’s wrong? We want to move to Azure Typical dependency structure Persistence change = somewhere between massive rework to lots of code adjustments We want to add a thick client against ADO for our existing web to Azure. UI against multiple data layers= somewhere between massive rework and lots of searching for dependencies
- 5. We need something more adaptable • We want to be able to swap out these layers with ease, or even on the fly.
- 6. What about this? Dependency-free foundation
- 7. How? • EF layer – Entities implement shared interfaces – Context implements IRepository<T> – T4 for automation – Query Interception • EF does not allow nor handle IQueryable<T> where T: (parent to an Entity)
- 8. Code Break
- 9. The Visitors are here
- 10. Sample Query in EF context
- 11. Performance left join and where
- 12. Performance Code
- 13. Performance select and where id> i take(50) Straight EF average: 103.811ms Intercepted average: 220.3158ms
- 14. More Performance Straight EF Average=1190.3ms Intercepted Average=1274.43 ms
- 15. Domain Layer - How? • Constructor Injection • Depends ONLY on the shared interfaces (and sometimes DTOs) • No state, only behavior
- 16. Domain Code
- 17. Domain Code – public sample
- 18. Domain Code – public sample
- 19. Domain – Data Layer check-mate SELECT [Extent2].[ID] AS [ID], [Extent2].[DealID] AS [DealID], [Extent2].[ScenarioNumber] AS [ScenarioNumber], [Extent2].[ServiceCodeID] AS [ServiceCodeID], [Extent2].[CountryCode] AS [CountryCode], [Extent2].[CurrencyCode] AS [CurrencyCode], [Extent2].[PriceListID] AS [PriceListID], [Extent2].[BranchID] AS [BranchID], [Extent2].[ExchangeRate] AS [ExchangeRate], [Extent2].[Volume] AS [Volume], [Extent2].[ActualPrice] AS [ActualPrice], [Extent2].[CurrentPrice] AS [CurrentPrice], [Extent2].[StandardPrice] AS [StandardPrice], [Extent2].[MinVol] AS [MinVol], [Extent2].[MaxVol] AS [MaxVol], FROM [Treasury].[Deal] AS [Extent1] INNER JOIN [Treasury].[DealActivity] AS [Extent2] ON [Extent1].[DealID] = [Extent2].[DealID] WHERE [Extent1].[RegionID] IN (5,1,6,4,2)
- 20. UI layer - How? • Controller requires appropriate Model(s) • No dependencies on the data layer
- 21. UI layer – controller code
- 22. Create - post
- 23. Delete and Edit
- 24. Edit - post
- 25. View sample Create + Edit
- 26. Edit scripts
- 27. Technologies utilized • Mvc3 – Now open source! - http://aspnet.codeplex.com/ • T4 - http://en.wikipedia.org/wiki/Text_Template_ Transformation_Toolkit – T4Mvc - https://t4mvc.codeplex.com/ • Ninject – http://ninject.org • jQuery - http://jquery.com/ • IQToolkit - http://iqtoolkit.codeplex.com/
- 28. References • Orm speed comparison - http://code.google.com/p/dapper-dot-net/ • Open Stackoverflow question - http://stackoverflow.com/questions/9422789 /can-you-program-against-interfaces-in-ef-if- you-do-not-make-use-of-navigation-pr
- 29. Available SideBar or presentations • Static Reflection • A maybe monad in .net – http://maybe.codeplex.com • Unit Testing – Asp.net Routing • T4 – DTO generation • Hybrid Winforms/Mvc application – Hybrid winforms+mvc pages • Mvc – Inline templates – Custom templates
Editor's Notes
- #2: IRepository, Entity Framework, T4, Front-To-Back
- #3: Ask for input, what difficulties could this structure cause?
- #4: Linq to Entities, vs. Linq to Objects, vs. Linq to Azure?
- #5: Linq to Entities, vs. Linq to Objects, vs. Linq to Azure?
- #7: Mark Seemann - http://blog.ploeh.dk/
- #9: When I serialized out an entity, properties that were non-poco came with. Translate anonymous types in this layer
- #22: Does not rely on model directly – sample for ideas, not completely clean