OData Make a Feed for That

OData
“Make An AppA Feed For That”
http://christopherDeweese.com
http://twitter.com/cdeweese

This session
A Problem
What is OData?
Nuts & Bolts
Make a feed for that (.NET 4/VS 2010 - *bling*)

Alt.Title
‘Make Your Data Show It’s “O-Face”’
Credit: @drusellers

A Problem
Middle-Tier Data Access
DatabaseServers
Front-End
Servers
Middle-TierServers

What is it?
Open Data Protocol
A protocol for working with data via HTTP
Developed as protocol for “Astoria”/ADO.Net Data Services
V2 implemented in WCF Data Services

Intrigued. Continue.
Represent structured data in a rich way
Supports multiple formats – Xml, Json
Xml is based on Atom Pub
Currently released under Microsoft’s Open Specification Promise

What you get
OData services provide a Service Document that is all about Metadata
Rich metadata allows consumers to understand data shape & types
OData is modular; only implement the pieces you need

More Xml?
More than just spewing Xml
OData is about making data accessible and queryable using standard Http verbs & actions
Don’t forget! OData supports JSON too (if you hate Xml that much)

Query over Http?
OData provides query operators to sort & filter data via URIs
$filter
$orderby
$skip, $top
… and there’s more
Producers implement query operators around their data

Query? Over Http?
Ever tried to build a “queryable” web service with SOAP?
Bottom line: Ugly.
OData: Not-so-uglyhttp://myblog.com/blog.svc/Posts?$filter=TagName%20eq$20‘WCF’

Why Http?
OData takes what works for the web
Using Http as it was meant to be used
Follows REST style philosophy – uses URIs as resources
[OData team does not claim to be ‘restful’]
Makes Data accessible to apps via the most successful protocol in use – Http.
Not another “SOAP”
ATOM, JSON - Easy integration with Modern Languages & Frameworks

Terminology
Entity – Representation of data – Blog Post, Product, Movie, etc.
Feed – A collection of entities exposed through a service.
Producer – Services that exposes data using OData feeds – Netflix, MIX10, NerdDinner
Consumer – An application or framework that can consume OData feeds – Silverlight 4, PowerPivot, PHP*, Objective-C* [*=using OData SDK]

OData “Ecosystem”
Slide Credit: Session FT13 from MIX10

OData in the Wild
Servers
WCF Data Services
SharePoint 2010
SQL Server Reporting Services 2008 R2
SQL Azure
IBM WebSphereeXtremeScale
Microsoft Media Room
WCF RIA Services
Services
Netflix
Mix 2010
Nerd Dinner
Vancouver’s vanGuide
Open Government Data Initiative
Open Science Data Initiative
Microsoft Codename “Dallas”
City of Edmonton
Clients
Excel + PowerPivot
LINQPad
OData Explorer
Client libraries
.NET
Silverlight
Windows Phone 7 Series
Javascript
Java
Objective-C
PHP
Slide Credit: Session FT13 from MIX10

Let’s Take a Peek
NUTS! (and bolts too)
Photo Credit:SashaW via Flickr

Feed for What?
Scott Hanselman’sStackOverflow Challenge
Using a recent dump of the SO Database, let’s build a feed for that
Read Scott’s post here: http://bit.ly/bq5WA9

Stuff We Didn’t Cover
Creating/Deleting Entities
Security (ASP.NET/Windows/NTLM)
Other Languages, JavaScript, PHP, Etc.
Media Streaming/Content Delivery support (WCF Data Services/IDataServiceStreamProvider)
Lots of other things..

Take-a-ways
OData is a protocol for enabling data-driven, web-based services
In .NET OData is implemented by WCF Data Services using EF
Developers can take control of Entity Access & Performance tuning of WCF Data Service (caching, paging)
OData uses existing authentication & authorization schemes
OData feeds can replace existing web APIs with a data-centric model

Discussion

Thanks!
OData resources:
http://odata.org/
http://blogs.msdn.com/astoriateam
Contact me:
http://christopherDeweese.com
@cdeweese on the Twitter

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OData Make a Feed for That

by Chris Deweese on May 01, 2010

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OData Make a Feed for That — Presentation Transcript