LINQ to Relational in VS 2008 Sp1

1. LINQ to “Relational” (L2R) in Visual Studio 2008 SP 1 Mike Taulty Developer & Platform Group Microsoft Ltd [email_address] http://www.miketaulty.com

2. Where Are We?

3. “ Traditional” ADO.NET Data Access App Code Customers ADO.NET DataReader Customers Command “ SELECT * FROM CUSTOMERS” DataSet

4. “ Traditional” ADO.NET Data Access App Code Customers ADO.NET Layer DataReader Customers Command “ SELECT * FROM CUSTOMERS” Data Object Load() Customer FirstName LastName ... Customer FirstName LastName ... Customer FirstName LastName ... Customer FirstName LastName ... ORM

5. Language Integrated Query from data in someDataSource join otherData in someOtherSource on keyExpr equals keyExpr ( into itemName )? let someVariable = someExpression where somePredicate orderby ( expression ( ascending | descending )?)* select expression group expression by keyExpression into itemName .NET Framework V3.5 Service Pack 1 Language Features ( C# V3 and VB V9 ) Custom Objects XML SQL Entities

6. LINQ is not just relational

7. Two Different Styles of LINQ from data in someDataSource join otherData in someOtherSource on keyExpr equals keyExpr ( into itemName )? let someVariable = someExpression where somePredicate orderby ( expression ( ascending | descending )?)* select expression group expression by keyExpression into itemName IEnumerable<T> IQueryable<T>

8. IEnumerable/IQueryable

11. L2R – Commonality in Querying App Code Customers “ LINQ” Queryable Object DataReader Customers LINQ Query Call Execute Context GetQueryable<T>() Execute<T>() Customer FirstName LastName ... Customer FirstName LastName ... Customer FirstName LastName ... Materialise objects ADO.NET Provider Translate to SQL ORM Metadata Create

12. L2R – Commonality in Modifying App Code Customers “ LINQ” Context Customer FirstName LastName ... Customer FirstName LastName ... Customer FirstName LastName ... “ Create”<T>() “ Delete”<T> SaveChanges() Create Delete Update State Del Del Del Ins Upd Save ADO.NET Provider Translate to SQL ORM Metadata

13. L2R - Differences

14. LINQ to Relational

15. Resources

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