Entity Framework 4 In Microsoft Visual Studio 2010 - ericnel
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Session on Entity Framework 4 in Visual Studio 2010 delivered at www.dotnetdevnet.com in Bristol on 3rd Dec.
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Entity Framework 4 In Microsoft Visual Studio 2010 - ericnel
- 1. ADO.NET Entity Framework in Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 Eric Nelson eric.nelson@microsoft.com http://geekswithblogs.net/iupdateable (or http://bit.ly/ericnelson ) http://twitter.com/ericnel http://twitter.com/ukmsdn Developer Evangelist Microsoft UK
- 2. Were you on twitter last Dec?http://twitter.com/ericnel
- 3. Agenda Quick recap of the journey so far Entity Framework 4.0 Drill Down Lots of demos
- 4. Object Relational Mapping Many ORMs out there No clear “winner” = relatively little adoption of ORM Developers waiting on Microsoft Then we shipped two ... hmmm LINQ to SQL in Visual Studio 2008 ADO.NET Entity Framework in Visual Studio 2008 SP1
- 5. ADO.NET Entity Framework Recap Entity Data Model Tools and services to create an Entity Data Model (EDM) Conceptual to Mapping to Storage Tools and services for consuming an Entity Data Model LINQ to Entities, Object Services and Entity SQL Together they address the “impedance mismatch” Objects in Applications Conceptual Mapping Storage Rows in Tables
- 6. Entity Framework 1.0Too many pain points The designer! Model First not supported Poor support for Stored Procedures No Pluralization/Singularization Foreign Keys hidden Lazy Loading not supported Missing LINQ Operators vs LINQ to SQL Generated SQL unreadable No support for Plain Old CLR Objects N-Tier difficult
- 7. Entity Framework 4.0Removing the friction Better Tools and Design Experience More powerful/flexible runtime And Persistence Ignorance* Code Only* N-Tier* Note: * Delivered in .NET Framework 4 and a separate download
- 8. Better Tools and Design Experience Model First Templated code generation Stored Procedures Pluralization/Singularization Complex Types Better delete and search
- 9. Model First and Templated Code Generation demo
- 10. More powerful/flexible runtime Lazy Loading (Deferred Loading in Beta 1 ) Foreign Keys surfaced More complete LINQ implementation ExecuteStoreQuery EntityFunctions and SqlFunctions Improvements to generated SQL
- 11. Deferred Loading, Functions, Generated SQL demo
- 13. Persistence Ignorance First class support for Persistence Ignorance No modifications to your classes!
- 15. Code Only Create the database from the classes No model Convention to config
- 16. Code Only demo
- 17. N-Tier Self Tracking Entities
- 18. N-Tier demo
- 19. Entity Framework The designer! No support for Plain Old CLR Objects No Pluralization/Singularization Foreign Keys hidden Model First not supported Lazy Loading not supported Missing LINQ Operators vs LINQ to SQL Generated SQL unreadable N-Tier difficult Poor support for Stored Procedures
- 20. Summary Entity Framework 4.0 is rather nice! We continue to listen and improve Resources Install VS2010 Beta 2 http://bit.ly/vs2010b2 My blog for EF 4 posts http://bit.ly/ericnelson Channel 9 Screencasts on EF4 http://bit.ly/ch9ukdevteam Entity Framework 4.0 Resources http://bit.ly/ef4resources Entity Framework Team Blog http://blogs.msdn.com/adonet/ Entity Framework Design Blog http://blogs.msdn.com/efdesign/
Editor's Notes
- LLBLGen Pro http://www.llblgen.com/Nhibernatehttp://www.hibernate.org/343.htmlEntitySpaceshttp://www.entityspaces.net/Portal/Default.aspxOpen Access http://www.telerik.com/products/orm.aspxDevForcehttp://www.ideablade.com/XPO http://www.devexpress.com/Products/NET/ORM/Lightspeedhttp://www.mindscape.co.nz/products/LightSpeed/default.aspxPlus many, many moreOf 31 .NET ORMs in 2003, 9 lasted to 2008
- Code GenIn V1 we had EntityClassGenerator which could be configured using eventsHard (it used CodeDom)Inflexible (not much control)In V2 we will haveTemplatedEntityClassGenerator and will ship default T4 templatesCustomization via ToolsUses Workflow FoundationComplex typesPluralizationPublic abstract PluralizationServiceDefault implementation is English OnlyDefault rules:EntityTypes / ComplexTypes are singularizedEntitySets are pluralizedNavigation Properties based on cardinalityStored ProceduresStored Procedures as functionsMapping support for stored procedure resultComplex type as return typeScalar and void return typeEntity CUD using Stored ProceduresNo need to have SPs for all CUD
- Foreign KeysIndependent Association – v1 Product p = new Product { ID = 1, Name = "Bovril", Category = context.Categories .Single(c => c.Name == "Food") }; context.SaveChanges(); FK Association – v2 Product p = new Product { ID = 1, Name = "Bovril", CategoryID = 13 }; context.Products.AddObject(p); context.SaveChanges();Deferred LoadingCan do lazy loadContext.deferredloading=true Model Level using ESQL<Function Name=“CustomerFullName” ReturnType=“String”><Parameter Name=“customer” Type=“MyModel.customer”> <DefiningExpression>customer.FirstName + ‘ ‘ + customer.LastName </DefiningExpression> </Function>Enables from c in ctx.Customers select c.FullName()CLR Level [EdmFunction("MyModel", "CustomerFullName")] public static string FullName(this customer c) { return String.Format("{0} {1}", c.FirstName, c.LastName); }Enables Console.WriteLine(c.FullName());Inline Functions in ESQL using Northwind;function AmountPurchased(c Customer) as Sum (c.Sales.Amt)function AmountReturned(c Customer) as Sum (c.Returns.Amt)function AmountConsumed(c Customer) as AmountPurchased(c) – AmountReturned(c)select AmountConsumed(c) from Customers as c;
- Code OnlyNo XML files, no model!Convention to configE.g. Convention: xxxID to a primary key, schema=dboE.g. Config: On map to schema sys and class property to table column[TableMapping(Schema=“sys”,TableName=“MyDBTable”][ColumnMapping(PropertyName=“MyClassProp1”, ColumnName=“table_column1”)][Key(PropertyName=“MyClassProp1”)]public objectset<MyThing> MyThings...