ODataA Standard API for Data Access

Pat Patterson

Developer Evangelist Architect, salesforce.com

@metadaddy

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Pat PattersonDeveloper Evangelist Architect

@metadaddy

RESTful APIs are GREAT!

$ curl -H 'X-PrettyPrint:1' \-H 'Authorization: Bearer ACCESS_TOKEN' \https://na1.salesforce.com/services/data/v31.0/sobjects/Account/001E0000002Jv2eIAC{ "Id" : "001E0000002Jv2eIAC”, "Name" : "Edge Communications", "AccountNumber" : "CD451796", …}

BUT…

• REST is a style, not a standard• RESTful, RESTlike, RESTish• URL parameters?

– e.g. retrieve only a subset of properties

• Retrieve a set of records via a query?• Metadata

– WADL?– RAML?– Swagger?

Enter… ODatawww.odata.org

“OData is a standardized protocol for creating and consuming data APIs.

OData builds on core protocols like HTTP and commonly accepted methodologies like REST.

The result is a uniform way to expose full-featured data APIs.”

OData

• Proposed by Microsoft– 2009

• Standardized by OASIS– 2014

OData

• URIs for resource identity

http://services.odata.org/V4/OData/OData.svc/Products

?$filter=Rating+eq+3&$select=Rating,+Name

OData

• HTTP transport– GET, POST, PUT/PATCH/MERGE, DELETE

GET /V4/OData/OData.svc/Products(1) HTTP/1.1Host: services.odata.org HTTP/1.1 200 OK...

OData

• Atom XML/JSON representation

OData ExamplesService Document (JSON)

$ curl 'http://services.odata.org/V4/OData/OData.svc/'{ "@odata.context": "http://services.odata.org/V4/OData/OData.svc/$metadata", "value": [ { "kind": "EntitySet", "name": "Products", "url": "Products" }, { "kind": "EntitySet", "name": "ProductDetails", "url": "ProductDetails" }, ...

OData ExamplesService Document (XML)

$ curl 'http://services.odata.org/V4/OData/OData.svc/?$format=xml'<?xml version="1.0" encoding="utf-8"?><service xmlns="http://www.w3.org/2007/app" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:m="http://docs.oasis-open.org/odata/ns/metadata" xml:base="http://services.odata.org/V4/OData/OData.svc/" m:context="http://services.odata.org/V4/OData/OData.svc/$metadata"> <workspace> <atom:title type="text">Default</atom:title> <collection href="Products"> <atom:title type="text">Products</atom:title> </collection> <collection href="ProductDetails"> <atom:title type="text">ProductDetails</atom:title> </collection> ...

OData ExamplesMetadata (XML Only )

$ curl 'http://services.odata.org/V4/OData/OData.svc/$metadata'<?xml version="1.0" encoding="utf-8"?><edmx:Edmx xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx" Version="4.0"> <edmx:DataServices> <Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="ODataDemo"> <EntityType Name="Product"> <Key> <PropertyRef Name="ID"/> </Key> <Property Name="ID" Type="Edm.Int32" Nullable="false"/> <Property Name="Name" Type="Edm.String"/> ...

OData ExamplesQuery

$ curl 'http://services.odata.org/V4/OData/OData.svc/Products?$filter=Rating+eq+3&$select=Rating,+Name'{ "@odata.context": "http://services.odata.org/V4/OData/OData.svc/$metadata#Products(Rating,Name)", "value": [ { "Name": "Milk", "Rating": 3 }, { "Name": "Vint soda", "Rating": 3 }, ...

OData ExamplesGet Individual Entity

$ curl 'http://services.odata.org/V4/OData/OData.svc/Products(1)'{ "@odata.context": "http://services.odata.org/V4/OData/OData.svc/$metadata#Products/$entity", "ID": 1, "Name": "Milk", "Description": "Low fat milk", "ReleaseDate": "1995-10-01T00:00:00Z", "DiscontinuedDate": null, "Rating": 3, "Price": 3.5}

OData ExamplesUpdate Entity

$ curl -w "Status: %{http_code}\\n” \ -H 'Content-Type: application/json' \ -X PATCH \ -d '{"@odata.type":"ODataDemo.Product","Price":"2.99"}' \ 'http://services.odata.org/V4/OData/OData.svc/Products(1)’

Status: 204

Odata Adoption

•Microsoft•SAP•Salesforce•IBM•RedHat

OData Librarieswww.odata.org/libraries

• Java• .Net• JavaScript• Objective-C• Python• Ruby• Node.js• PHP• C++

OData-Supporting Products

•Microsoft SQL Server•Windows Azure Active Directory•SAP NetWeaver• IBM WebSphere•JBoss Teiid•Salesforce1 Platform Connect

Salesforce1 Platform Connect Demo

OData Summary

•Standardizes data-centric web services•Exposes Data and Metadata•JSON or XML (Atom/AtomPub) representation over HTTP•Wide industry support