Connect to SAP Netweaver Gateway Data from Blazor Apps

Blazor is a framework for developing modern, client-side web UIs using .NET technology. Instead of coding in JavaScript, developers can use the familiar C# language and .NET libraries to build app UIs.

The CData ADO.NET Provider for SAP Netweaver Gateway can be used with standard ADO.NET interfaces, such as LINQ and Entity Framework, to interact with live SAP Netweaver Gateway data. Since Blazor supports .NET Core, developers can use CData ADO.NET Providers in Blazor apps. In this article, we will guide you to build a simple Blazor app that talks to SAP Netweaver Gateway using standard SQL queries.

Install the CData ADO.NET Provider for SAP Netweaver Gateway

CData ADO.NET Providers allow users to access SAP Netweaver Gateway just like they would access SQL Server, using simple SQL queries.

Install the SAP Netweaver Gateway ADO.NET Data Provider from the CData website or from NuGet. Search NuGet for "SAP Netweaver Gateway ADO.NET Data Provider."

Create a SAP Netweaver Gateway-Connected Blazor App

Start by creating a Blazor project that references the CData ADO.NET Provider for SAP Netweaver Gateway

1. Create a Blazor project on Visual Studio.
👁 Create a Blazor app project.

2. From the Solution Explorer, right click Dependencies, then click Add Project Reference.
3. In the Reference Manager, click the Browse button, and choose the .dll file of the installed ADO.NET Provider (e.g. System.Data.CData.SAPGateway.dll, typically located at C:\Program Files\CData\CData ADO.NET Provider for SAP Netweaver Gateway\lib etstandard2.0).
👁 Reference ADO.NET for SAP Netweaver Gateway .dll in the Blazor app.

SELECT SAP Netweaver Gateway Data from the Blazor App

1. Open the Index.razor file from the Project page.
2. In a SAPGatewayConnection object, set the connection string:

   SAP Gateway allows both basic and OAuth 2.0 authentication. You can use basic authentication to connect to your own account, or you can use OAuth to enable other users to retrieve data from your service with their accounts. In addition to authenticating, set the following connection properties to access SAP Gateway tables.

   • Url: Set this to the URL of your environment, or to the full URL of the service. For example, the full URL might appear as: https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/. In this example, the environment URL would just be: https://sapes5.sapdevcenter.com.
   • Namespace: Set the appropriate Service Namespace. In the example above, IWBEP is the namespace. It is optional if the full URL to the service is specified.
   • Service: Set this to the service you want to retrieve data from. In the example above, the service is GWSAMPLE_BASIC. It is not required if the full URL is specified.

   Authenticate via Basic Authentication

   In basic authentication, you use your login credentials to connect. Set the following properties:

   • User: This is the username you use to log in to SAP Gateway.
   • Password: This is the password you use to log in to SAP Gateway.

   Authenticate via OAuth Authentication

   You can connect to SAP Gateway using the embedded OAuth connectivity (without setting any additional authentication connection properties). When you connect, the OAuth endpoint opens in your browser. Log in and grant permissions to complete the OAuth process. See the OAuth section in the online Help documentation for more information on other OAuth authentication flows.

   For example: User=user;Password=password;URL=https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/;InitiateOAuth=GETANDREFRESH;

3. The code below creates a simple Blazor app for displaying SAP Netweaver Gateway data, using standard SQL to query SAP Netweaver Gateway just like SQL Server.

    @page "/"
    @using System.Data;
    @using System.Data.CData.SAPGateway;
    
    <h1>Hello, world!</h1>
    
    Welcome to your Data app.
    
    <div class="row">
    <div class="col-12">
    
    @using (SAPGatewayConnection connection = new SAPGatewayConnection(
    "User=user;Password=password;URL=https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/;InitiateOAuth=GETANDREFRESH;"))
    {
    var sql = "SELECT ProductID, Quantity FROM SalesOrderLineItems WHERE Quantity < 15";
    var results = new DataTable();
    
    SAPGatewayDataAdapter dataAdapter = new SAPGatewayDataAdapter(sql, connection);
    dataAdapter.Fill(results);
    
    <table class="table table-bordered">
    <thead class="thead-light">
    <tr>
    @foreach (DataColumn item in results.Rows[0].Table.Columns)
    {
    <th scope="col">@item.ColumnName</th>
    }
    </tr>
    </thead>
    <tbody>
    @foreach (DataRow row in results.Rows)
    {
    <tr>
    @foreach (var column in row.ItemArray)
    {
    <td>@column.ToString()</td>
    }
    </tr>
    }
    </tbody>
    </table>
    }
    </div>
    </div>
    

4. Rebuild and run the project. The ADO.NET Provider renders SAP Netweaver Gateway data as an HTML table in the Blazor app. 👁 Query SAP Netweaver Gateway from Blazor app.
   

   At this point, you have a SAP Netweaver Gateway-connected Blazor app, capable of working with live SAP Netweaver Gateway data just like you would work with a SQL Server instance. Download a free, 30-day trial and start working with live SAP Netweaver Gateway data in your Blazor apps today.