Entity Framework 4 In Microsoft Visual Studio 2010

ADO.NET Entity Framework in Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 Eric Nelson [email_address] http://geekswithblogs.net/iupdateable http://twitter.com/ericnel Developer Evangelist Microsoft UK Advert Alert http://ukazure.ning.com

Agenda
Swift intro to Entity Framework
Entity Framework 4.0 Drill Down
Lots of demos

Why an ORM? Why Entity Framework?

ADO.NET Entity Framework Recap
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”
Rows in Tables Objects in Applications Conceptual Mapping Storage Entity Data Model

Model First and Templated Code Generation

Entity Framework 1.0 Features
Generate model from database schema
Very rich mapping layer
Inheritance, rename, aggregate, filter
Simplified CRUD operations
LINQ querying*
Worked with many databases
Database agnostic query language
SP support for data retrieval/modification*
Designer*
Strategic!

Entity Framework 1.0 - Too 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

Entity Framework 4.0

New in ADO.NET Entity Framework 4.0
Model-first development
Automatic pluralization
Foreign keys in models
POCO class support (Add-in)
Lazy loading
T4 Code Generation
Template customization
IObjectSet
Virtual SaveChanges
ObjectStateManager control
Self-tracking entities
SQL generation improvements
More LINQ operator support
LINQ extensibility
ExecuteStoreQuery
ExecuteStoreCommand
SPROC import improvements
Model defined functions
WPF designer integration
Code-First development (Feature CTP)

Entity Framework 4.0 - Removing the friction
Better Tools and Design Experience
More powerful/flexible runtime
And
Persistence Ignorance*
N-Tier
Code First*
Note:
* Delivered in a separate download

Better Tools and Design Experience
Model First
Templated code generation
Stored Procedures
Pluralization/Singularization
Complex Types
Better delete and search

Model First and Templated Code Generation

More powerful/flexible runtime
Lazy loading
Foreign Keys surfaced
More complete LINQ implementation
ExecuteStoreQuery
EntityFunctions and SqlFunctions
Improvements to generated SQL

Deferred Loading, Generated SQL

http://blogs.msdn.com/adonet/archive/2009/08/05/improvements-to-the-generated-sql-in-net-4-0-beta1.aspx

Feature Pack / Add-Ins
Separate downloads
Feature Pack
Code First support
Add-In
T4 Template for Persistence Ignorance/POCO

Persistence Ignorance/POCO
First class support for Persistence Ignorance
No modifications to your classes!

N-Tier

Code First (was Code Only)
Create the database from the classes
No model
Convention to config

Database First / Model First / CodeOnly
Database First (EF v1)
Model First
Code First

Code Only

N-Tier (Self Tracking Entities)
Service
public class NorthwindService : INorthwindService
{
public Customer GetCustomer( string id)
{
using ( var ctx = new NorthwindEntities ())
{
return ctx.Customers.Include( "Orders" )
.Where(c => c.CustomerID == id)
.SingleOrDefault();
}
}
public bool SubmitOrder( Order newOrder)
{
using ( var ctx = new NorthwindEntities ())
{
ctx.Orders.ApplyChanges(newOrder);
ValidateOrderGraph(ctx, newOrder);
return ctx.SaveChanges() > 0 ;
}
}
}
Client
static bool ValidSTEUpdate( INorthwindService svc)
{
var customer = svc.GetCustomer( "ALFKI" );
// modify contact name of customer
customer.ContactName += "+" ;
// add a new order
var newOrder = new Order ();
newOrder.Order_Details.Add( new Order_Detail ()
{
ProductID = products.Where(p => p.ProductName == "Chai" ).Single().ProductID,
Quantity = 1
});
customer.Orders.Add(newOrder);
return svc.SubmitOrder(newOrder);
}
Danny Simmons MSDN Article: Building N-Tier Apps with EF4 http://code.msdn.microsoft.com/mag200911EF4 http://msdn.microsoft.com/en-gb/magazine/ee335715.aspx

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

Summary
Entity Framework 4.0 is rather nice!
We continue to listen and improve
Resources
http://bit.ly/ericnelson
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/

© 2009 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION. Required Slide

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Entity Framework 4 In Microsoft Visual Studio 2010

by Eric Nelson on Mar 21, 2010

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Entity Framework 4 In Microsoft Visual Studio 2010 — Presentation Transcript