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

Getting Started

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Install the CData ADO.NET Provider for Snowflake

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

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

Create a Snowflake-Connected Blazor App

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

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

SELECT Snowflake Data from the Blazor App

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

   To connect to Snowflake:

   1. Set User and Password to your Snowflake credentials and set the AuthScheme property to PASSWORD or OKTA.
   2. Set URL to the URL of the Snowflake instance (i.e.: https://myaccount.snowflakecomputing.com).
   3. Set Warehouse to the Snowflake warehouse.
   4. (Optional) Set Account to your Snowflake account if your URL does not conform to the format above.
   5. (Optional) Set Database and Schema to restrict the tables and views exposed.

   See the Getting Started guide in the CData driver documentation for more information.

   For example: Authscheme=Password;URL=https://myaccount.snowflakecomputing.com;User=Admin;Password=test123;Server=localhost;Database=Northwind;Warehouse=TestWarehouse;Account=Tester1;

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

         @page "/"
         @using System.Data;
         @using System.Data.CData.Snowflake;
         
         <h1>Hello, world!</h1>
         
         Welcome to your Data app.
         
         <div class="row">
             <div class="col-12">
         
                 @using (SnowflakeConnection connection = new SnowflakeConnection(
                   "Authscheme=Password;URL=https://myaccount.snowflakecomputing.com;User=Admin;Password=test123;Server=localhost;Database=Northwind;Warehouse=TestWarehouse;Account=Tester1;"))
                 {
                     var sql = "SELECT Id, ProductName FROM Products";
                     var results = new DataTable();
         
                     SnowflakeDataAdapter dataAdapter = new SnowflakeDataAdapter(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 Snowflake data as an HTML table in the Blazor app.

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