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ODATA Reads

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Data Reads

In this solution I have used Web API 2.2 with ODATA v4

ODATA v4 package

Visual Studio has a built in package to create ODATA v4 services, Package contains all the libraries required to create a ODATA v4 endpoint.

Integrate ODATA v4 package into solution

We can add the necessary OData package into solution like this, Select Microsoft ASP.NET Web API 2.2 for OData v4.0

All the relevant libraries are installing

Register OData endpoint

Register service endpoint in Register method of WebApiConfig file

ODataModelBuilder modelBuilder = new  ODataConventionModelBuilder(); 
modelBuilder.EntitySet("Students"); 
config.MapODataServiceRoute("ODataRoute", "odata", modelBuilder.GetEdmModel());

In line no 22, I have exposed the Student entity, Data read method is implemented in OData controller, Student Controller

ODATA Operations

Student Controller implements OData Controller

public class  Students Controller : ODataController
{
    List<Student> students = new  List<Student>() { };
 
    [EnableQuery]
    public IQueryable<Student> Get()
    {
        return students.AsQueryable();
    }

Student Controller inherits from OData Controller, So all the CRUD operations related to student can be implemented in this controller.

How it works in the browser

now ping to the OData endpoint,

We can see all the available entities in the endpoint with metadata.

Read Students

By appending entity, Student into url, we can read student data

Read Data types

We can read data types of student using the $metadata tag.

Excel with ODATA

Excel 2016 with OData v4

We already know office is not only for manipulating documents, We can perform many advanced queries with Excel. Excel supports to fetch data from different other sources, newer update is OData sources

In excel 2016, We can connect to a OData source like this,

But we get an error!!!!!!

It clearly says Excel 2016 can be only integrated with Odata v3 or any earlier data feeds :) But for your information, with Excel 2016 as well as Excel 2013, we can integrate OData v3

Excel 2013 & OData v4 ?

With Excel 2013, ODATA v4 is not compatible. But we can use a V3 format service with Excel 2013.

Excel 2016 with OData v4 - Power Query

With ODATA v4, we can’t use ODATA source option, But we have Power Query option to analyse data.

In Data tab, we have many options to fetch data from different other sources, We can select From OData Feed option.

We can use Office 2016 Power Query option with OData v4.

Power Query Editor

This is the query editor, we can select/remove columns, can remove duplicates, group by a column, create a new column based on a mathematical function and much more advanced operations.

In the next section, we’ll see how to read data by passing a value

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