A clean repository pattern in ef

A Clean Repository Pattern In EF Via Interfaces By Brandon D’Imperio Imaginarydevelopment.blogspot.com

What’s wrong?Typical dependency structure

What’s wrong? We want to move to AzureTypical dependency structure We want to add a thick client against ADO for our existing web to Azure.

What’s wrong? We want to move to AzureTypical 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

We need something more adaptable• We want to be able to swap out these layers with ease, or even on the fly.

What about this?Dependency-free foundation

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)

Code Break

The Visitors are here

Sample Query in EF context

Performanceleft join and where

Performance Code

Performanceselect and where id> i take(50) Straight EF average: 103.811ms Intercepted average: 220.3158ms

More PerformanceStraight EF Average=1190.3msIntercepted Average=1274.43 ms

Domain Layer - How?• Constructor Injection• Depends ONLY on the shared interfaces (and sometimes DTOs)• No state, only behavior

Domain Code

Domain Code – public sample

Domain – Data Layer check-mateSELECT[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)

UI layer - How?• Controller requires appropriate Model(s)• No dependencies on the data layer

UI layer – controller code

Create - post

Delete and Edit

Edit - post

View sampleCreate + Edit

Edit scripts

Technologies utilized• Mvc3 – Now open source! - http://aspnet.codeplex.com/• T4 - http://en.wikipedia.org/wiki/Text_Template_Tran – T4Mvc - https://t4mvc.codeplex.com/• Ninject – http://ninject.org• jQuery - http://jquery.com/• IQToolkit - http://iqtoolkit.codeplex.com/

References• Orm speed comparison - http://code.google.com/p/dapper-dot-net/• Open Stackoverflow question - http://stackoverflow.com/questions/9422789/can• Dependency Injection in .net by Mark Seemann - http://manning.com/seemann

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 3/4 – Inline templates – Custom templates• XNA – http://PitofDespair.codeplex.com

A clean repository pattern in ef

by jaxarcsig on May 24, 2012

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