Entity FrameworkJorge Fioranelli | b: blog.jorgef.net | e: jorge.fioranelli@gmail.com

Agenda

IntroductionBasic ConceptsPOCOsCode GenerationUnit TestingN-TiersCTP4

Versions

Version 1 .Net 3.5 sp1 EF 3.5

Version 2 .Net 4 EF 4(aka EF )

EF and LINQ2SQL

Data Programmability

Team

Entity Framework

ESQL

Language Development Team

LINQ2SQL

LINQ

Data Programmability

Team

Entity Framework

ESQL

Language Development Team

LINQ2SQL

LINQ

LINQ

Data Programmability

Team

Entity Framework

ESQL

LINQ2SQL

LINQ

LINQ

Future

“If you’re a .NET developer, Entity Framework is where we’re going.

We’re there. Get on board, it’s time.”

Don Box, PDC 2009

Source: Programming Entity Framework 2nd Edition, Julia Lerman

New EF4 Features Customizable Code-

Generation Design-time support for

Complex Types Pluralization Multi-Targeting Support Persistence Ignorance &

POCO Self-Tracking Entities & N-

Tier support Application Patterns and

Testability Foreign Key Associations Lazy Loading

More LINQ Operators in LINQ to Entities

CreateDatabase and DDL Provider Services

Model Defined Functions LINQ support

EntityDataSource support for QueryExtender, POCO and FKs

ObjectMaterialized event Generated SQL

improvements for better performance and readability

Ad-hoc native query support

Entity Data Model

Entity Framework evolves from “Entity Relationship Modeling” (Dr. Peter Chen – 1976)

In 2006 Microsoft Research published the first paper on “Entity Data Model”

Tables Objects

Entity Data Model (EDMX)

Storage Model (SSDL)

Mappings (MSL)

Conceptual Model (CSDL)

Model First

Code First (CTP4)Database First

Database, Model or Code First

DB

Model

Code

DB

Model

Code

DB

Model

(no visual)

Code

Demo 1Introduction

Agenda

IntroductionBasic ConceptsPOCOsCode GenerationUnit TestingN-TiersCTP4

Associations

Early Load

Deferred Load Explicit Load

Lazy Load

context.Products.Include("Category")

product.CategoryReference.Load()

product.Category

context.LoadProperty(product, p => p.Category)

context.Products.Include(p => p.Category) //CTP4

Updating Entities

context DB

Change Tracking

productNameColor

var product = ... //queryproduct.Name = "New Name";product.Color = "Blue";context.SaveChanges();

Update (on SaveChanges)

Query Result

Inserting Entities

context DBnewCateg

ory

Insert (on SaveChanges)

var newCategory = new Category() {...};context.Categories.AddObject(newCategory);context.SaveChanges();

Add Object

Change Tracking

Inserting Entities by Association

context DB

Change Tracking

productCategoryCategoryI

D

newCategory

Insert (on SaveChanges)

var product = ... //queryvar newCategory = new Category();product.Category = newCategory;context.SaveChanges();

Add Association

Query Result

Deleting Entities

context DB

Change Tracking

orderDetail

Delete (on SaveChanges)Delete Object

Query Result

var orderDetail = ... //querycontext.OrderDetails.DeleteObject(orderDetail);context.SaveChanges();

Attaching Entities

context DBexistingCateg

ory

Update (on SaveChanges)

var existingCategory = new Category() {...};existingCategory.Name = "Old Name"; // no change trackingcontext.ProductCategories.Attach(existingCategory);existingCategory.Name = "New Name";context.SaveChanges();

Attach

Change Tracking

Demo 2Basic Operations

Agenda

IntroductionBasic ConceptsPOCOsCode GenerationUnit TestingN-TiersCTP4

Plain Old CLR Objects (POCOs)

EntityObjectEntityReference

EntityCollection

Relationship Manager

Property Change Events

POCO Entity

VS

Entity

Demo 3Plain Old CLR Objects

Agenda

IntroductionBasic ConceptsPOCOsCode GenerationUnit TestingN-TiersCTP4

Code First (CTP4)Database First

Code Generation

DB

Model

Code

DB

Model

Code

Model First DB

Model

(no visual)

Code

Demo 4Code Generation

Agenda

IntroductionBasic ConceptsPOCOsCode GenerationUnit TestingN-TiersCTP4

Unit Testing

Repository

UnitOfWork

DBEntity

ServiceView

Controller

Model

common unit testing scopeunit tests

for Repositories

Unit Testing

ObjectContext

ObjectSet<T>

IObjectSet<T>

ObjectQuery<T>

NorthwindCtxObjectSet

<Product>

ProductRepository

CategoryRepository

ObjectSet<Category

>

Unit Testing

ObjectContext

ObjectSet<T>

IObjectSet<T>

ObjectQuery<T>

NorthwindCtxIObjectSet

<Product>

ProductRepository

CategoryRepository

IObjectSet

<Category>

INorthwindCtx

Demo 5Unit Testing

Agenda

IntroductionBasic ConceptsPOCOsCode GenerationUnit TestingN-TiersCTP4

Self-tracking Entities

context DB

Change Tracking

product

Query Result

Client product

No Change Tracking

EF change tracking

context DB

Change Tracking

product

Query Result

Client product

Change Tracking

State + Changes are transferred

Self-tracking Entities

Update

Update?

N-Tiers with POCOs

context DB

Change Tracking

product

Query Result

Client product

Change Tracking

State + Changes are transferred

Self-tracking Entities

context DB

product

Query Result

Client product

Just POCO’s state is transferred

POCO Entities

Update

Update

Demo 6 – Demo 7N-Tiers

Agenda

IntroductionBasic ConceptsPOCOsCode GenerationUnit TestingN-TiersCTP4

Code First (CTP4)

Model First

Database First

Code First (Community Technical Preview 4)

DB

Model

Code

DB

Model

Code

DB

Model

(no visual)

Code

Productivity Improvements(Community Technical Preview 4)

DbContext

NorthwindCtxDbSet

<Product>DbSet

<Category>

ObjectContext

NorthwindCtxObjectSet<Product>ObjectSet<Category

>ObjectConte

xt

Demo 8Community Technical Preview 4

Out of Scope

Table Splitting Inheritance Complex types Entity SQL Transactions Concurrency SPs, Views and Functions

Resources

Programming Entity Framework 2nd Edition – Julia Lerman

ADO.NET Team Bloghttp://blogs.msdn.com/adonet

EF Design Bloghttp://blogs.msdn.com/efdesign

Data Developer Centerhttp://msdn.com/data

Entity Framework Forumhttp://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework

Resources PDC 2010 video:

Code First Development with Entity Framework http://player.microsoftpdc.com/Session/68cfa011-c399-4151-ad9f-748d8723a19d

Tech-ed 2010 videos: Data Development GPS

http://www.msteched.com/2010/NorthAmerica/DEV324 Overview of the Microsoft ADO.NET Entity Framework 4.0

http://www.msteched.com/2010/NorthAmerica/DEV205 Deep Dive into Microsoft ADO.NET Entity Framework

http://www.msteched.com/2010/NorthAmerica/DEV305

PDC 2009 video: Evolving ADO.NET Entity Framework in .NET 4 and Beyond

http://www.microsoftpdc.com/2009/FT10

QuestionsJorge Fioranelli | b: blog.jorgef.net | e: jorge.fioranelli@gmail.com