OData · SAP NetWeaver Gateway SAP OpenUI5 SAP “SAP NetWeaver Gateway provides an API that is...

ODataThe best way to REST

Sam Xu

Software Engineer II

Microsoft

• SDE II at Microsoft Shanghai ZiZhu

• Almost 4 Years in Microsoft

• 3+ years in OData Team

• Focus on ODL, Web API OData

• http://github.com/xuzhg

About me

Agenda

• What is OData?

• Where is OData?

• Who provides OData?

• Why choose OData?

What is OData?

Web Services – SOAP vs REST

SOAP REST

Overhead Heavyweight Lightweight

Metadata Complex Simple

Operations SOAP envelope HTTP VERB (Get, Post…)

Resource identity SOAP envelope HTTP URI

• REST: Representational State Transfer• SOAP: Simple Object Access Protocol

Open Data Protocol (OData)

• An open protocol of OASIS standard to allow the creation and consumption of queryable and interoperable RESTful APIs in

a simple and standard way.[ ]• OASIS standard (2014/3/17)• HTTP Request/Response, Method, Status codes, etc• Entity Data Model (EDM)• JavaScript Object Notation (JSON)• Rich Query Options ($filter, $expand, etc)• ……

OData Spec

http://odata.org

Where is OData?

Microsoft

Microsoft

Office 365 API

Azure APIsExcel and

PowerQuery

“The Office 365 APIs follow REST and OData 4.0 standards for data transport, and use the OAuth 2.0 standard for authentications and authorization.”

“Azure Search service API uses Open Data Protocol (OData) for index queries. Azure Search supports OData version 4.”

“Microsoft Power Query for Excel’s OData V4 support leverages the built-in functionality of the OData service to bring only the relevant data back into Excel. ”

More …

SAP NetWeaver Gateway SAP OpenUI5

SAP

“SAP NetWeaver Gateway provides an API that is designed to function in just such a manner; and it does so using the OData protocol.”

“It eases your development with a client-side HTML5 rendering library including a rich set of controls and supports data binding to different models (JSON, XML and OData).”

Salesforce’s OData product:

Lightning Connect & DataDirect Cloud

“With external objects you can connect to an external data source like SAP or any other database that uses OData protocol or a simple URL.”

Who provides OData?

OData libraries by Microsoft

Source: https://github.com/OData/Document: http://odata.github.io/

OData libs on Nuget.org

OData libraries by Apache

http://olingo.apache.org/

OData libraries by JayData

http://jaydata.org/

OData libraries by Breeze

http://www.getbreezenow.com/documentation/odata

Why choose OData?

Advantages

OData

OpenStandard

Interoperability

RESTfulness

Queryability

Industry practice

Community

OData is an open standard

Standardization history

V1.0 (2007)

V2.0 (2009)

V3.0 (2012)

V4.0 (2014) V4.0 (will submit to ISO this year)

OData OASIS TC participants

OData provides interoperability

Openness leads to interoperability

Agreed resource identification method

Agreed resource representation

Agreed resource operation

OData APIs are RESTful

OData follows REST principles

OData provides API queryability

Rich system query options

• To narrow the result set$filter

• To narrow the set of properties$select

• To do client side paging$top and $skip

• To sort the result set$orderby

• To take advanced results$count, $search,

$value, $format…

OData represents industry practices

Specification covering every aspect of REST

Model representation

Batch & asynchronous

requests

VersioningChange

requesting

URL conventions

Queries OperationsData

annotation…

Entity Data model

Http Verbs

Context URL

OData Version

Query Options

Industry practices in different businesses

Enterprises

• Microsoft

• SAP

• Salesforce

• IBM

• Schneider

Electrics

SaaS providers

• Blue garden

• K2

• Creditpoint

• Questionmark

• Splunk

Integration service

providers

• Jitterbit

• ODataHQ

• Mulesoft

• Juhe Data (聚合

数据)

• Progress software

Library and tooling

implementers

• JayData

• Apache

• Breeze

• Gizur

• Pragmatiqa

• Tableau

http://www.OData.org/ecosystem/

OData has a prosperous community

Three personas and their needs

RESTful API/client

Developers

• Tutorials

• Documentations

• Community

• Libraries

• Tooling

Business decision

makers

• Success stories

• Customers

• Business benefits

API advocates

• A good protocol

to advocate and

learn from

• Everything the

first two

personas need

Source Codes

Home of the OData community

http://www.odata.org/

DEMO

Basic OData URI examples

http://services.odata.org/V4/TripPinService

http://services.odata.org/V4/TripPinService/$metadata

http://services.odata.org/V4/TripPinService/People

http://services.odata.org/V4/TripPinService/People('russellwhyte')

Advance Query option examples

http://services.odata.org/V4/TripPinService/People?$filter=startswith(LastName,'A')

http://services.odata.org/V4/TripPinService/People?$select=UserName

http://services.odata.org/V4/TripPinService/People?$top=2&$skip=1

http://services.odata.org/V4/TripPinService/People?$orderby=FirstName%20desc

http://services.odata.org/V4/TripPinService/People?$filter=Friends/any(e0:startswith(e0/FirstName,'W') and Friends/any(e1:(LastName eq 'Alfred')))&$select=UserName,Friends

Summary

OData - The best way to REST

• Open protocol, open source libraries, open

communityOpen

• Protocol built on REST principlesRESTful

• Available on any device, any platform, anywhereUbiquitous

• Build on industry best practices, supported and

used by Enterprises that serves billions of usersPractical

Resources

• OData communityHome: • http://www.OData.org

• OASIS OData TC Home: • https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=OData

• OData on GitHub: • https://github.com/OData/

• OData V4 sample servicesTripPin (read & write):• http://services.OData.org/V4/TripPinServiceRW

• OData team of MicrosoftMail to: • ODatafeedback@microsoft.com

Go to:

Thank You!