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

Install the CData ADO.NET Provider for Google Data Catalog

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

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

Create a Google Data Catalog-Connected Blazor App

Start by creating a Blazor project that references the CData ADO.NET Provider for Google Data Catalog

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.GoogleDataCatalog.dll, typically located at C:\Program Files\CData\CData ADO.NET Provider for Google Data Catalog\lib etstandard2.0).
👁 Reference ADO.NET for Google Data Catalog .dll in the Blazor app.

SELECT Google Data Catalog Data from the Blazor App

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

   Google Data Catalog uses the OAuth authentication standard. Authorize access to Google APIs on behalf on individual users or on behalf of users in a domain.

   Before connecting, specify the following to identify the organization and project you would like to connect to:

   • OrganizationId: The ID associated with the Google Cloud Platform organization resource you would like to connect to. Find this by navigating to the cloud console.

     Click the project selection drop-down, and select your organization from the list. Then, click More -> Settings. The organization ID is displayed on this page.

   • ProjectId: The ID associated with the Google Cloud Platform project resource you would like to connect to.

     Find this by navigating to the cloud console dashboard and selecting your project from the Select from drop-down. The project ID will be present in the Project info card.

   When you connect, the OAuth endpoint opens in your default browser. Log in and grant permissions to the application to completes the OAuth process. For more information, refer to the OAuth section in the Help documentation.

   For example: ProjectId=YourProjectId;InitiateOAuth=GETANDREFRESH;

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

    @page "/"
    @using System.Data;
    @using System.Data.CData.GoogleDataCatalog;
    
    <h1>Hello, world!</h1>
    
    Welcome to your Data app.
    
    <div class="row">
    <div class="col-12">
    
    @using (GoogleDataCatalogConnection connection = new GoogleDataCatalogConnection(
    "ProjectId=YourProjectId;InitiateOAuth=GETANDREFRESH;"))
    {
    var sql = "SELECT Type, DatasetName FROM Schemas WHERE ProjectId = 'bigquery-public-data'";
    var results = new DataTable();
    
    GoogleDataCatalogDataAdapter dataAdapter = new GoogleDataCatalogDataAdapter(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 Google Data Catalog data as an HTML table in the Blazor app. 👁 Query Google Data Catalog from Blazor app.
   

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