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Building nTier Applications with Entity Framework Services (Part 1)
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Building nTier Applications with Entity Framework Services (Part 1)


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Learn how to build real world nTier applications with the new Entity Framework and related services. With this new technology built into .NET, you can easily wrap an object model around your database …

Learn how to build real world nTier applications with the new Entity Framework and related services. With this new technology built into .NET, you can easily wrap an object model around your database and have all the data access automatically generated or use your own stored procedures and views. The session will demonstrate how to create and consume these new technologies from the ground up and focus on database modeling including views and stored procedures along with coding against the model via LINQ. Dynamic data website will also be demonstrated.

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  • Goals:To show a new way of serving up dateGet you thinking to learn more when you leave this presentation
  • How do you or have you designed your applications??? Be truthful!!N-tier application architecture provides a model for developers to create a flexible and reusable application. By breaking up an application into tiers, developers only have to modify or add a specific layer, rather than have to rewrite the entire application over, if they decide to change technologies or scale up. In the term "N-tier," "N" implies any number -- like 2-tier, or 4-tier; basically, any number of distinct tiers used in your architecture. Application architectures are part of Layer 7 of the OSI model.
  • Talk about the separation between database developer and programmer.
  • Talk about the separation between database developer and programmer.
  • Applications can work in terms of a more application-centric conceptual model, including types with inheritance, complex members, and relationships.Applications are freed from hard-coded dependencies on a particular data engine or storage schema.Mappings between the conceptual model and the storage-specific schema can change without changing the application code.Developers can work with a consistent application object model that can be mapped to various storage schemas, possibly implemented in different database management systems.Multiple conceptual models can be mapped to a single storage schema.Language-integrated query (LINQ) support provides compile-time syntax validation for queries against a conceptual model.
  • POCO = Plane Old .NET Classes
  • Demo: AdventureWorks.DataDemo: AdvertureWorks.ExampleDemo: EntityDesignerDiagram.png
  • Demo: AdventureWorks.DataDemo: AdvertureWorks.ExampleDemo: EntityDesignerDiagram.png
  • Transcript

    • 1. Building nTier Applications with Entity Framework ServicesPart 1
    • 2.
    • 3. Check Out Your Local User Groups!
      San Diego Cloud Computing User Group
      San Diego .NET Developers Group
      San Diego .NET User Group
      San Diego SQL Server User Group
    • 4. Win Free Software!
      Provide your business card (or email and name)*
      Indicate on the back what software you are interested in
      Otherwise I will pick 
      Winners will be picked next week
      *Yes, most likely I’m going to send you and email about my user group ( and or web site (
      CodeRush and Refactor Pro from DevExpress (4)
      SecondCopy (automatic backup software) (5) *
      CodeIt.Right Standard from SubMain (4)
      *Requires mailing address and phone number
    • 5. Agenda
    • 6. Overview
    • 7. nTier Architecture Overview
      Model to create flexible reusable applications
      Only need to modify or add layers instead of rewriting entire applications over
    • 8. User Experience
      Active Directory, Card Space, Windows Identity Foundation
      UI Components
      Windows Forms, Windows Presentation Foundation, ASP.NET (AJAX, MVC), Silverlight, Windows Mobile
      Presentation Layer
      Local Storage/ Cache
      Communications Layer
      Windows Communication Foundation (WCF), WCF Data Services, Web Services, Sync Services, Azure (Cloud), RIA Services, Workflow Services
      Business Layer
      Business Entities
      T4 Templates
      Business Components
      Business Workflow
      Windows Workflow Foundation
      Data Layer
      Entity Framework, LINQ to SQL, DataSets
      SQL Server
    • 9. Entity Framework
    • 10. Object Relational Mapping
      What is ORM?
      Technique for working with relational tables as if they were objects in memory
      Intention is to hide away the complexity of the underlying tables and give a uniform way of working with data
      Why use ORM?
      Retain database independence
    • 11. Object Relational Mapping
      It’s nothing new, just new to .NET
      There are many ORMs for .NET developers already in existence. E.g.
      LLBLGen Pro
    • 12. The Microsoft Entity Data Model
      An extended relational model with Entity-Relationship Model concepts
      Entity Types
      Strong type with Identity
      Scalar/Complex properties
      Hold instances of Entity Types
      Similar to relational tables
      Can have multiple Entitysets of the same EntityTypes
      Relationships ("Associations")
      Named relationships between Entities
      0..1:*, 0..1:0..1, 1:1, 1:M, M:N
      Navigation may be exposed as NavigationProperties on EntityTypes
      Contains instances of associations
      May be queried directly
      Contains EntitySets, AssociationSets
      EmployeeID = 294272LoginID = adamTitle = "Dev Lead"VacationHours = 0…
      EmployeeID = 729742LoginID = peteTitle = "Developer"VacationHours = 0…ExpenseAccount = …CarLicenseNum = ……
      EmployeeID = 729742LoginID = peteTitle = "Developer"VacationHours = 0…ExpenseAccount = …CarLicenseNum = ……
      EmployeeID = 729742LoginID = peteTitle = "Developer"VacationHours = 0…ExpenseAccount = true…
    • 13. EDM & Entity Framework?
      The Entity Framework (EF) is an Object Relational Modeling tool leveraging the EDM
      Focus on your domain, not how to persist!
      EDM is used to describe your model.
      Allows different rate of change between database and code!
      EF uses a storage model and mapping to enable this.
    • 14. ADO.NET Entity Framework
    • 15. EF Providers in Progress
    • 16. LINQ to Entities – Lots of Topics
    • 17.
    • 18. Pain Points in v3.5 SP1
      Pluralization/ Singularization
      Foreign Keys
      Model First
      Lazy Loading
      Additional LINQ Operators
      L2S Features & Patterns
      SQL Gen Improvements
    • 19. Fixing the Paint Points in EF1
      Advanced/ New Features
    • 20. Model First
      Create your conceptual model first (not from an existing database)
      Wizard will allow the creation of sql scripts to create database scripts.
      Also will create EDM files
      Creates SQL Server, SQL Server Express, SQL Server Compact database scripts.
    • 21. Lazy Loading
      Enables retrieving all related data (without asking for it)
      Off by default
      Settable on the ContextOptions
      Good for doing reporting!
      Not great for going across services
      Dim ctx As New AdventureWorksLT_DataEntities()
      ctx.ContextOptions.LazyLoadingEnabled = True
    • 22. T4 Templates
      Override default EF classes to create…
      POCO Entity Generator
      Better for going over RESTful service layers
      Self-Tracking Entity Generator
      Better for server/ client local storage.
      Auto generates classes when models change!
      Or can be run manually.
      Easily modifiable for your own needs
      Once you learn the T4 scripting language.
    • 23.
    • 24. Summary
    • 25. Conclusion
    • 26. Resources
      ADO.NET Team Blog
      EF Design Blog
      Visual Studio Data Blog
    • 27. Resources
      Dan Simmons Blog
      MSDN Code Gallery
      WCF Data Services Learning Guide:
      WCF Data Services Team Blog
    • 28. Required Book!
      EF4 In Aug 2010