OData - The Universal REST API
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OData is an open protocol initiated by Microsoft to create and consume queryable and interoperable REST APIs efficiently. It simplifies data access with uniform URL conventions and operations built on REST principles, making it easier for organizations to adopt compared to traditional REST APIs. The document discusses OData's evolution, its advantages, and the resources available for implementation and usage.
OData - The Universal REST API
- 1. OData - The Universal REST API Nishanth Kadiyala Product Marketing Manager Progress DataDirect @nish_kadi https://www.linkedin.com/in/nishanthkadiyala/
- 2. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.2 Agenda Background : API Landscape Basics of OData Who is part of this ecosystem? How to produce OData? Evolution and Limitations
- 3. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.3 Let’s do a quick poll…. How many different REST APIs does your organization consume today? • 0-5 • 6-10 • 11-15 • >15 How many of you have heard about OData before this session? How many of you use OData today?
- 4. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.4 Observed Trends Impacts government, science and enterprise Data Silos -> Open Data APIs need to support both on-premises and cloud On Premises -> Cloud Mobile, Tablet, Laptop Desktops -> BYOD RESTful programming patterns SOAP APIs -> Resource-oriented APIs
- 5. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.5 There are over 17000 APIs and 40 new APIs are added everyday. Data Source API Eloqua Web Services API (REST/SOAP) Bulk and non-Bulk APIs No query language Oracle Service Cloud Web Services APIs (REST/SOAP) ROQL Google Analytics Hypercube (query limits of 10 metrics grouped by max of 7 dimensions) Salesforce SOAP, BULK, Metadata API, REST, SOQL
- 6. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.6 REST is great, but…. …..OData is the solution • It is a style, not a standard. So, each REST API is different • Limited and different querying capabilities • CRUD operations are often implemented differently • Metadata is not always exposed via the URL • Harder for developers to adopt and maintain a new API
- 7. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.7 An open protocol to allow the creation and consumption of queryable and interoperable RESTful APIs in a simple and standard way What is OData? Progress was first member of OData Technical Committee following Microsoft Started by Microsoft in 2007 OASIS Standard since Feb 2014 Ratified as an ISO standard in Feb 2017
- 8. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.8 OData is essentially SQL for the web built on top of standard protocols – HTTP, JSON & ATOM – while leveraging the REST architecture style OData is the standard for REST ODATA ODATA- The standard REST API HTTP XML Atom publishing JSON
- 9. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.9 Why are organizations adopting OData? Operations built on REST principles Uniform URL Conventions Consumer oriented conceptual resource model Easy access to Metadata Interoperability across multiple applications If you know SQL, OData is easy to learn/adopt
- 10. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.10 Background : API Landscape Basics of OData Who is part of this ecosystem? How to produce OData? Evolution and Limitations
- 11. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.11 Defined Conventions • Resource retrieval, Query, Insert, Update, Delete, Custom Functions/Actions • Batch Requests • Delta Requests • Metadata Description • Relationship Navigation • Filter, Sort, Top/Skip, Expand, Projection, Aggregation COMMON REQUESTS URL QUERY CONVENTIONS
- 12. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.12 URL Query Conventions
- 13. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.13 Resource URL BankingDetails https://service.datadirectcloud.com/api/odata/SQLServerOnPrem/BankingTables?$format=JSON $Select=x,y https://service.datadirectcloud.com/api/odata/SQLServerOnPrem/BankingTables?$select=AcctNumber,AcctState $Filter https://service.datadirectcloud.com/api/odata/SQLServerOnPrem/BankingTables?$filter=AcctState eq 'TU‘ (similarly ne,gt,lt) AND https://service.datadirectcloud.com/api/odata/SQLServerOnPrem/BankingTables?$select=AcctNumber,AcctState&$top=5 Orderby https://service.datadirectcloud.com/api/odata/SQLServerOnPrem/BankingTables?$orderby=AcctBranch asc, AcctState desc URL Query Conventions
- 14. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.14 Background : API Landscape Basics of OData Who is part of this ecosystem? How to produce OData? Evolution and Limitations
- 15. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.15 Broad Adoption for OData
- 16. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.16 Here are some of the scenarios where enterprises are adopting OData: External objects
- 17. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.17 Our 4th Annual data access outlook survey shows that OData is growing strong 486 108 16 249 78 61 0 100 200 300 400 500 600 700 800 REST OData GraphQL API Landscape Currently Use Plan to use in the next 2 years
- 18. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.18 Background : API Landscape Basics of OData Who is part of this ecosystem? How to produce OData? Evolution and Limitations
- 19. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.19 OData Libraries - http://www.odata.org/libraries/ .NET Java JavaScript Other RESTier Apache Olingo Node-odata ODataCpp (C++) ODataLib SDL OData Frameworks DevExtreme Pyslet Python Package Edmlib Odata4j o.js ODataStore for CoreData (iOS) ASP.NET Web API OData Jello Framework OpenUI5 OData4ObjC (iOS) AdaptiveLINQ ODataJClient JayData OData Client Library for Tcl/Tk Microsoft.Spatial Breeze.js
- 20. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.20 Or You can use DataDirect Cloud to produce OData Why DataDirect Cloud? • OData from any data source • No Coding • No version control needed • Patented on-premises gateway technology
- 21. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.21 DEMO
- 22. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.22 Background : API Landscape Basics of OData Who is part of this ecosystem? How to produce OData? Evolution and Limitations
- 23. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.23 OData specification is continuously evolving… •Limitations • It is not great for Bulk Data Transfer yet • OData 2.0 doesn’t support aggregation, Filter expansion, etc. • OData 4.0 queries are not all compatible with 2.0 •Evolution • 4.01 adds Aggregation/Group By • JSON has been made the default format • Supports Dynamic Metadata Schema • Support for Filter Expansion (You can now ask for a customer and his details alone) • Asynchronous support for long- running requests • Many more new features…
- 24. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.24 Resources: 1. Understanding OData in 6 steps 2. What is OData? Quick Guide 3. Salesforce External Objects, Salesforce Connect and OData 4. Firewall-Friendly On-Premises Data Access 5. Webinar on SaaS OData External Data Integration Strategy
- 26. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.26 APPENDIX
- 27. © 2016 Progress Software Corporation and/or its subsidiaries or affiliates. All rights reserved.27 OData for Analytics in data visualization (consumers) • Tableau • Tibco Spotfire • Microsoft PowerBI • IBM Cognos • SAP Lumira