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1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd [email protected] http://www.mtaulty.com

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Page 1: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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ADO.NET Data Services

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

Page 2: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

Agenda

Overview

Exposing data sources

Building clients

Server-side interception

Page 3: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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

Page 4: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

RESTful Web Services?

Resources

Res 1

Res 2

Res 3

Res 4

HTTP RequestURL

VERBPayload

HTTP Response

Status

GETPOSTPUT

DELETEXML JSON

Payload

XML JSON

Page 5: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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”?

Page 6: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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*)

Page 7: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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Exposing Data

demo

Page 8: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

ADO.NET Entity Framework ?

SQL Provider Oracle Provider ...

Entity Provider

Conceptual Model

Store Model

Map

ADO.NET API ORM API

Page 9: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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Using Entity Framework Data

demo

Page 10: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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

Page 11: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

Operators for $filterLogic

eqnegtgteqltlteqandornot

Arithmeticaddsubmuldivmodroundfloorceiling

Stringcontainsendswithstartswithlengthindexofinsertremove x 2replacesubstringtolowertouppertrimconcat

Date/Timesecondhourminutedaymonthyear

Typeisofcast

Page 12: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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Querying with the URI

demo

Page 13: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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

Page 14: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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Building Clients

demo

Page 15: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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

Page 16: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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Interception, Operations

demo

Page 17: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

“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

Page 18: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

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 )

Page 19: 1 ADO.NET Data Services Mike Taulty Developer & Platform Group Microsoft Ltd Mike.Taulty@microsoft.com

© 2008 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.