OData everywhere

Matt MilnerPluralsight

Overview

What and why of OData

OData client ecosystem

OData We need another data access

technology?

ODBCOLE DB

ADO RDO

ADO.NET

Linq to SQL EntityFramework

DataSetWhich of these is cross platform?

Open Data Protocol

Open: HTTP, ATOMPub, JSON

Data: Querying & updating

Protocol: Data format, uri constraints, metadata

ProtocolGET http://localhost/TaskService.svc/Tasks Accept: application/json

HTTP/1.1 200 OKDataServiceVersion: 1.0;Content-Length: 876Content-Type: application/json;charset=utf-8

{"d" : [ {"__metadata": {"uri": "http://localhost/TaskService.svc/Tasks(2)", "type": "TaskDBModel.Task"}, "TaskID": 2, "AssignedTo": "3", "DueDate": "\/Date(1298505600000)\/", "Description": "hire HR manager", "Priority": 1, "PercentComplete": 25 } ] }

POST http://localhost/TaskService.svc/Tasks HTTP/1.1Content-Type: application/jsonAccept: application/jsonContent-Length: 153

{"Description":“Fire Sally","Priority":1,"PercentComplete":25, "DueDate":"\/Date(1298505600000)\/","AssignedTo":"3"}

Protocol

HTTP/1.1 201 CreatedDataServiceVersion: 1.0;Content-Length: 297Location: http://localhost/TaskService.svc/Tasks(5)Content-Type: application/json;charset=utf-8{"d" : {"__metadata": {"uri": "http://localhost/TaskService.svc/Tasks(5)", "type": "TaskDBModel.Task"}, "TaskID": 5, "AssignedTo": "3", "DueDate": "\/Date(1298505600000)\/", "Description": “Fire Sally", "Priority": 1, "PercentComplete": 25}}

System query optionsOption Description Example

$filter Filters the result set /Movies?$filter=Title eq ‘Star Wars’

$orderby Sort the target resources /Movies?$orderby=Title desc

$top Return only the top n resources /Movies?$top=10/Movies?$orderby=Title&$top=5

$skip Skip the first n resources /Movies?$skip=100&$top=10

$select Create a projection /Movies(1)/’Reviews?$select=rating,reviewer

$inlinecount Includes the total count /Movies?$top=100&$inlinecount=allpages

$value Retrieve a value without any surrounding metadata

/Movies(2)/Title/$value

$expand Eager loading of specified elements

/Movies(1)?$expand=Reviews

OData producers

Producers

• SharePoint 2010• SQL Azure• Azure Table Storage• IBM WebSphere• Data Market• . . .

Services

• Ebay• Facebook• Netflix• Pluralsight

OData clients

Windows

.NET

Silverlight

PowerPivot

Browsers

Atom

JavaScript

jQuery

Open Source

PHP

Ruby

Java

Mobile

Win Phone 7

IPhone / IPad (objective C)

Android

Windows / .NET Add Service

Reference Managed data

context Full batching

support Databinding

Silverlight DataServiceCollection –

async load Out of browser support Browser or custom

credentials (OOB)

PowerPivot Analytics Charting Relationships

Browsers JSON / ATOM JavaScript

library

Open source Ruby = gem install

ruby_odata Java = RestLet extension PHP = PHPDataSvcUtil

Phones Native libraries for Mac

and WP7 Restlet / java support on

Android

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