1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd [email protected] .

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ADO.NET Data Services

Mike TaultyDeveloper & Platform GroupMicrosoft [email protected] http://www.mtaulty.com

Agenda

Overview

Exposing data sources

Building clients

Server-side interception

Data Services – Overview

Provides new functionalityCRUD access to data over RESTful web servicesBuilt-in URI-based query syntaxClient-side libraries for .NET, Silverlight and AJAX

Builds on top of Windows Communication Foundation V3.5Status

In VS 2008 Service Pack 1, .NET Framework 3.5 Sp1Shipped in 2008

RESTful Web Services?

Resources

Res 1

Res 2

Res 3

Res 4

HTTP RequestURL

VERBPayload

HTTP Response

Status

GETPOSTPUT

DELETEXML JSON

Payload

XML JSON

RESTful?

REpresentational State TransferServer-side resources identified by a URIAccess is over HTTP, verb tied to action

GET to read the value of a resourcePOST to create a new resourcePUT to update an existing resourceDELETE to delete a resource

Returned data is “plain” – XML or JSONIs this “the death of SOAP”?

Data? What Kind of Data?

Provide a type with public properties which are IQueryable<T>

Some rules about how T has to be formedRemember the extension method AsQueryable()

Only get write access if your type implements IUpdatableWorks well with generated code from;

ADO.NET Entity Framework (ObjectContext)LINQ to SQL (DataContext*)

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Exposing Data

demo

ADO.NET Entity Framework ?

SQL Provider Oracle Provider ...

Entity Provider

Conceptual Model

Store Model

Map

ADO.NET API ORM API

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Using Entity Framework Data

demo

Querying with Data Services

URI based query mechanismhttp://myservice.svc/MyEntitySet

Supports the notion of navigating by primary key

MyEntitySet ( Col1=Value1, Col2=Value2, ... )Supports various operators

$orderby, $top, $skip, $expand, $filter, $value

Operators for $filterLogic

eqnegtgteqltlteqandornot

Arithmeticaddsubmuldivmodroundfloorceiling

Stringcontainsendswithstartswithlengthindexofinsertremove x 2replacesubstringtolowertouppertrimconcat

Date/Timesecondhourminutedaymonthyear

Typeisofcast

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Querying with the URI

demo

Building Clients

Services offer metadataMyService.svc/$metadata

.NET clients made easier through a proxy generation tool

Visual Studio or datasvcutil.exeUseful for both regular .NET clients & Silverlight

AJAX clients made easier through a script library

“ASP.NET AJAX 4.0 Preview 4”Available as a download on Codeplex

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Building Clients

demo

Interception & Operations

Possible to hook code into the frameworkFor queries we can write

Query interceptorsFor modifications we can write

Change interceptorsCan also expose custom functionality

Service OperationsUseful for providing “canned” functionality, can be parameterised

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Interception, Operations

demo

“Coming Soon”

ADO.NET Data Services V1.5Sits on top of .NET Framework V3.5 Sp1Feature and bug release

Data binding, row counts, paging, BLOB support, interface for provider writers

DownloadADO.NET Data Services Offline, Alpha Preview

Local SQL Compact DBAccessed via the same RESTful servicesKept in sync via the Sync FrameworkDownload

Resources

Other topics to considerBatching of queries, updatesOptimistic concurrency modeletc

Data Services (“Astoria”) Team Bloghttp://blogs.msdn.com/astoriateam

My website http://www.mtaulty.com ( search Data Services )

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