A really brief introduction to the OData protocol and how data are retrieved, transformed and exposed.

1. Introduction to Open Data Protocol.
OData
at glance
Brief introduction
eugenio lentini

2. • Defined by a data model
• made by properties, for instance:
• Person: {name, surname, gender, address}
• Organized in collection and identified using URLs
• serviceRoot/People
01 resource
OData

3. • Resources definition
• Consuming resources using HTTP messages
• REST APIs definition to publish and edit resources by a Web Client
02 enable
OData

4. GET serviceRoot/People get all the entities in the collection People
PUT serviceRoot/People
update an existing entity in the collection
People
POST serviceRoot/People add a new entity in the collection People
DELETE serviceRoot/People delete an entity in the collection People
03 definition
REST Api

5. Query
<XML>
OData
http://www.company.com/service/People
select * from people Table people <people>
<person>
<person>
</people>
People is a resource
exposed by the service
the service URL
04 example of request
OData

6. 1. Define a query
2. Define a resource name
3. Define how to transform the result of a query into XML
4. Associate the resource to that query
5. Request (GET) the resource to have XML data without knowing data
source
05 how to expose a resource
OData

7. • Hide the underlying data source whatever it is.
• Hide the schema and where data comes from.
• Standard way to publish and consume a resource.
• Multiple clients can use the service.
06 pros
OData

8. • Connection is via the web, possible lost of performance on big data.
• PowerPivot 2013 seems having issue managing associated big data.
• PowerPivot does not recognize associations defined by OData.
• Service must be implemented and tuned to optimized the performance.
07 cons
OData

9. Thank You for the attention.