Connect to Lakebase 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 Lakebase can be used with standard ADO.NET interfaces, such as LINQ and Entity Framework, to interact with live Lakebase 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 Lakebase using standard SQL queries.

Install the CData ADO.NET Provider for Lakebase

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

Install the Lakebase ADO.NET Data Provider from the CData website or from NuGet. Search NuGet for "Lakebase ADO.NET Data Provider."

Create a Lakebase-Connected Blazor App

Start by creating a Blazor project that references the CData ADO.NET Provider for Lakebase

1. Create a Blazor project on Visual Studio.

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.Lakebase.dll, typically located at C:\Program Files\CData\CData ADO.NET Provider for Lakebase\lib etstandard2.0).

SELECT Lakebase Data from the Blazor App

1. Open the Index.razor file from the Project page.
2. In a LakebaseConnection object, set the connection string: To connect to Databricks Lakebase, start by setting the following properties:
   • DatabricksInstance: The Databricks instance or server hostname, provided in the format instance-abcdef12-3456-7890-abcd-abcdef123456.database.cloud.databricks.com.
   • Server: The host name or IP address of the server hosting the Lakebase database.
   • Port (optional): The port of the server hosting the Lakebase database, set to 5432 by default.
   • Database (optional): The database to connect to after authenticating to the Lakebase Server, set to the authenticating user's default database by default.

   OAuth Client Authentication

   To authenicate using OAuth client credentials, you need to configure an OAuth client in your service principal. In short, you need to do the following:

   1. Create and configure a new service principal
   2. Assign permissions to the service principal
   3. Create an OAuth secret for the service principal

   For more information, refer to the Setting Up OAuthClient Authentication section in the Help documentation.

   OAuth PKCE Authentication

   To authenticate using the OAuth code type with PKCE (Proof Key for Code Exchange), set the following properties:

   • AuthScheme: OAuthPKCE.
   • User: The authenticating user's user ID.

   For more information, refer to the Help documentation.

   For example: DatabricksInstance=lakebase;Server=127.0.0.1;Port=5432;Database=my_database;InitiateOAuth=GETANDREFRESH;

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

         @page "/"
         @using System.Data;
         @using System.Data.CData.Lakebase;
         
         <h1>Hello, world!</h1>
         
         Welcome to your Data app.
         
         <div class="row">
             <div class="col-12">
         
                 @using (LakebaseConnection connection = new LakebaseConnection(
                   "DatabricksInstance=lakebase;Server=127.0.0.1;Port=5432;Database=my_database;InitiateOAuth=GETANDREFRESH;"))
                 {
                     var sql = "SELECT ShipName, ShipCity FROM Orders WHERE ShipCountry = 'USA'";
                     var results = new DataTable();
         
                     LakebaseDataAdapter dataAdapter = new LakebaseDataAdapter(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 Lakebase data as an HTML table in the Blazor app.

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