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

Install the CData ADO.NET Provider for Couchbase

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

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

Create a Couchbase-Connected Blazor App

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

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

SELECT Couchbase Data from the Blazor App

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

   To connect using the Login method, set User, Password, and Server to the credentials for the account and the address of the server you want to connect to.

   For example: User=myuseraccount;Password=mypassword;Server=http://mycouchbaseserver;

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

         @page "/"
         @using System.Data;
         @using System.Data.CData.Couchbase;
         
         <h1>Hello, world!</h1>
         
         Welcome to your Data app.
         
         <div class="row">
             <div class="col-12">
         
                 @using (CouchbaseConnection connection = new CouchbaseConnection(
                   "User=myuseraccount;Password=mypassword;Server=http://mycouchbaseserver;"))
                 {
                     var sql = "SELECT Contact.FirstName, SUM(Account.TotalDue) FROM Contact, Account GROUP BY Contact.FirstName";
                     var results = new DataTable();
         
                     CouchbaseDataAdapter dataAdapter = new CouchbaseDataAdapter(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 Couchbase data as an HTML table in the Blazor app.

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