Build MVC Applications with Connectivity to Google Cloud Storage Data

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Google Cloud Storage ADO.NET Provider

Rapidly create and deploy powerful .NET applications that integrate with Google Cloud Storage.



This article shows how to use only the Entity Framework and the CData ADO.NET provider to access Google Cloud Storage from an ASP.NET MVC application.

This article shows how to use wizards in Visual Studio to drop the CData ADO.NET Provider for Google Cloud Storage into a simple MVC (model, view, controller) project.

Create the Entity Framework Model

Follow the steps below to save connection properties and map tables to entities in the data model.

  1. Create a new MVC project in Visual Studio. In this example, the project name is MvcGoogleCloudStorageApp.
  2. If you are using Entity Framework 6, you will need to take the preliminary step of registering the Google Cloud Storage Entity Framework provider for your project. See the "LINQ and Entity Framework" chapter in the help documentation for a guide.

    Note that MVC 3 scaffolding and MVC 4 scaffolding do not support Entity Framework 6. You can use your scaffolding with Entity Framework 6 by upgrading to the latest version of MVC.

  3. To add the .edmx file from the designer, right-click your Models folder and click Add New Item. Select ADO.NET Entity Data Model, name the model, and click Add. In this example, the name of the model is GoogleCloudStorageModel.
  4. In the Entity Data Model wizard, select the option 'EF Designer from database'. The Entity Data Model wizard is displayed.
  5. Click New Connection. Select CData Google Cloud Storage Data Source in the dialog that is displayed.
  6. Specify the required connection string properties.

    Authenticate with a User Account

    You can connect without setting any connection properties for your user credentials. After setting InitiateOAuth to GETANDREFRESH, you are ready to connect.

    When you connect, the Google Cloud Storage OAuth endpoint opens in your default browser. Log in and grant permissions, then the OAuth process completes

    Authenticate with a Service Account

    Service accounts have silent authentication, without user authentication in the browser. You can also use a service account to delegate enterprise-wide access scopes.

    You need to create an OAuth application in this flow. See the Help documentation for more information. After setting the following connection properties, you are ready to connect:

    • InitiateOAuth: Set this to GETANDREFRESH.
    • OAuthJWTCertType: Set this to "PFXFILE".
    • OAuthJWTCert: Set this to the path to the .p12 file you generated.
    • OAuthJWTCertPassword: Set this to the password of the .p12 file.
    • OAuthJWTCertSubject: Set this to "*" to pick the first certificate in the certificate store.
    • OAuthJWTIssuer: In the service accounts section, click Manage Service Accounts and set this field to the email address displayed in the service account Id field.
    • OAuthJWTSubject: Set this to your enterprise Id if your subject type is set to "enterprise" or your app user Id if your subject type is set to "user".
    • ProjectId: Set this to the Id of the project you want to connect to.

    The OAuth flow for a service account then completes.

    A typical connection string is below:

    ProjectId='project1';InitiateOAuth=GETANDREFRESH
  7. Name the connection and select whether to include sensitive information, such as connection credentials, in the connection string. For simplicity, this example saves sensitive information in Web.config. The connection settings are saved as GoogleCloudStorageEntities.

  8. Select the views you need. In this example, Buckets is imported. Also, the option to pluralize object names is deselected in this example. Click Finish to create the .edmx file.
  9. Build your project to complete this step.

Scaffold the Controller and Views

After creating the model and building the project, you can use ASP.NET Scaffolding wizards to create the controller and the views.

  1. In Solution Explorer, right-click the controllers folder and click Add -> Controller. Select MVC 5 Controller with views, using Entity Framework.
  2. In the Add Controller dialog that is then displayed, select the following options:

    • Model class: Select a table you imported; for example, Buckets.
    • Data context class: Select your context class.
  3. Leave the default values for the other fields.

You can now access the list of Buckets records at http://MySite/Buckets. With every state change the site picks up any data changes.