What’s Coming in 2008 for ADO.NET Data Access

What’s Coming in 2008 for ADO.NET Data AccessMike TaultyDeveloper & Platform GroupMicrosoft LtdMike.Taulty@microsoft.comhttp://www.mtaulty.com

Agenda

ADO.NET Entity FrameworkCurrently at Beta 3Graphical tooling for VS 2008 at 2nd preview

ADO.NET Data ServicesCurrently at December CTP

Both in the ASP.NET 3.5 Extensions PreviewEF releases 1st half of 2008

Entity Framework

ADO.NET Entity Framework

Extends existing ADO.NET modelAdds additional capabilities

Abstraction from the underlying store schemaAbstraction from the underlying SQL dialect

Store

.NET Provider

ADO .NET V2.0

.NET Entity Provider (Entity SQL)

Command

ConnectionReader

V3.0

ADO.NET Entity Framework

Store

.NET Data Provider

V2.0

Command

ConnectionReader

Adapter

V3.0

Conceptual Model

Entity Entityrelationship

Mapping (MSL)

V3.0Programming Model

Object Relational Mapping

LINQ

ADO.NET Entity Framework

“Schema independence”“Store independence”Higher level constructs

RelationshipsInheritanceComposite Entities

Store

.NET Provider

V2.0

Conceptual Model

.NET Provider(EntitySQL)

ORM & LINQ

V3.0

Map

ping

ADO.NET Entity Framework

Data Services

Data Services

Exposes data over a RESTful web service interface

Entity Framework dataLINQ to SQL dataAny IQueryable data

Server-side is built with Windows Communication Foundation

Returns Atom Publishing Protocol (APP) or JSONClient-side libraries for .NET and AJAX

RESTful?

REpresentational State TransferIn a nutshell;

Server-side resources identified by a URIAccess is over HTTP, verb tied to action

– GET to read the value of a resource– POST to create a new resource*– PUT to update an existing resource*– DELETE to delete a resource

Returned data is “plain” – XML or JSON

Data Services - Querying

General Pattern

EntitySet

Key

Navigation Property

http://.../<EntitySet>[(<Key>)[/<NavigationProperty>[(<Key>)/...]]]

http://.../Customers

http://.../Customers(‘ALFKI’)

http://.../Customers(‘ALFKI’)/Orders

Data Services - Querying

Query string parameters;expand

orderby

skip

top

filter

http://.../Customers(‘ALFKI’)?$expand=Orders

http://.../Customers?$orderby=Country

http://.../Customers?$orderby=Country&$skip=10

http://.../Customers?$orderby=Country&$top=10

http://.../Customers?$filter=City eq ‘London’

Data Services – Other Features

Service OperationsExpose more advanced functionality

Query InterceptorsHook into requests for resources and run custom logic

Update InterceptorsHook into modifications for resources and run custom logic

ADO.NET Data Services

Resources

http://www.asp.net(3.5 Extensions)

MSDN in the UK

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