5. Are complex, presumptive Architecture systems that client got to work, usually with some degree of technical debt Contain certain key characteristics (some exist, others desired): Data Aware Transactional Concurrent Performant Compliant Fault-Tolerant (again – desired) Usable (almost always desired)

7. Workflow

10. 10 What is a Model? Database Tables Customer Entity Classes Model/Mappings Addresses Order Product Phone Customer Order US Product UK Product FK Product

13. 13 Improve Model By Refactoring Customer Customer Context Mappings Addresses Order Product Phone Customer US Product UK Product FK Product Intl Order Category Supplier Order Intl Order Supplier Category Customer Order Context Abbreviated customer table with Read-Only Fields

16. Context Object EF scans context for changes Wraps all updates as an Unit of Work

17. Default EF Transaction Behavior Maximizing Transaction Control - BeginTransaction API Sharing transaction with EF context - UseTransaction API

20. Same Record Whose changes are saved ?

21. modelBuilder.Entity ().Property(x => x.RowVersion).IsConcurrencyToken().HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed); modelBuilder.Entity ().Property(x => x.RowVersion).IsConcurrencyToken().HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed); exec sp_executesql N'UPDATE [dbo].[Phones] SET [Type] = @0 WHERE (([Id] = @1) AND ([RowVersion] = @2)) SELECT [RowVersion] FROM [dbo].[Phones] WHERE @@ROWCOUNT > 0 AND [Id] = @1', N'@0 nchar(10),@1 int,@2 binary(8)',@0=N'Home',@1=2894,@2=0x0000000000004656 exec sp_executesql N'UPDATE [dbo].[Phones] SET [Type] = @0 WHERE (([Id] = @1) AND ([RowVersion] = @2)) SELECT [RowVersion] FROM [dbo].[Phones] WHERE @@ROWCOUNT > 0 AND [Id] = @1', N'@0 nchar(10),@1 int,@2 binary(8)',@0=N'Home',@1=2894,@2=0x0000000000004656 You EF

22. Maintains three copies of data

23. Custom Concurrency Algorithm: Merging Results

27. DAL Database UI Entity Framework Query Execution Engine Request SQL QueryLINQ Query Untyped SQL Result Set Strongly-Typed Entity Objects Response EF materializes untyped SQL result set into strongly-typed entities Developers write strongly- typed LINQ expression EF transforms to provider- specific SQL and executes

30. Profile LINQ Query with SQL Profiler

32. Disregard Performance at your own Peril!

34. SaveChangesAsync()FirstOrDefaultAsync()ToListAsync() LoadAsync()SumAsync()MaxAsync ExecuteSqlCommandAsync()AnyAsync()FindAsync()

35. Asynchronous Queries

37. EF v1EF 4EF 4.1, 4.2EF 4.3EF 5EF 6 To leverage, must implement EF 5+ and.NET Framework 4.5+

39. LINQ Query Create Hash for Query Hash Exist in Cache? Add Parameters to SQL DB

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54. var customers = ctx.Customers.AsNoTracking().ToList();