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Consume Google Data Catalog OData Feeds in PowerBuilder
This article demonstrates how to consume Google Data Catalog data as OData feeds from PowerBuilder using the API Server.
The CData API Server, when paired with the ADO.NET Provider for Google Data Catalog (or any of 200+ other ADO.NET Providers), produces secure feeds of Google Data Catalog data that you can consume in PowerBuilder DataWindows. The API Server supports the major Web services, including OData, Atom, JSON, HTML, CSV, TSV, and RSS. It also supports the major authentication schemes and SSL.
This article shows how to create a DataWindow that uses the CData API Server to retrieve data.
Set Up the API Server
Follow the steps below to begin producing secure Google Data Catalog OData services:
Deploy
The API Server runs on your own server. On Windows, you can deploy using the stand-alone server or IIS. On a Java servlet container, drop in the API Server WAR file. See the help documentation for more information and how-tos.
The API Server is also easy to deploy on Microsoft Azure, Amazon EC2, and Heroku.
Connect to Google Data Catalog
After you deploy the API Server and the ADO.NET Provider for Google Data Catalog, provide authentication values and other connection properties needed to connect to Google Data Catalog by clicking Settings -> Connections and adding a new connection in the API Server administration console.
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.
You can then choose the Google Data Catalog entities you want to allow the API Server access to by clicking Settings -> Resources.
Additionally, click Settings -> Server and change the following settings for compatibility with PowerBuilder:
- Default Format: Select XML (Atom) in the menu.
- Default Version: Select 2.0 in the menu.
Authorize API Server Users
After determining the OData services you want to produce, authorize users by clicking Settings -> Users. The API Server uses authtoken-based authentication and supports the major authentication schemes. Access can also be restricted based on IP address; by default, only connections to the local machine are allowed. You can authenticate as well as encrypt connections with SSL.
Create a Profile for Google Data Catalog
Follow the steps below to use the Database Painter tool to create a database profile for the OData API of the API Server. In the Database Painter, you can graphically manipulate data as well as execute SQL queries.
- Click Tools -> Database Painter.
- Right-click the OData node and click New Profile.
- In the Database Profile Setup dialog, enter the following:
- Profile Name: Enter a user-friendly name for the profile.
- URI: Enter the URL to the OData endpoint of the API Server. This URL will resemble the one below:
http://MyServer:8032/api.rsc - Supply User Id and Password: Click this option to use HTTP Basic authentication. Note that the API Server also supports Windows authentication.
- User Id: Enter the name of an user in the API Server.
- Password: Enter the authtoken of an user in the API Server.
- To view and modify a table, right-click a table and then click Edit Data -> Grid.
Using Google Data Catalog Data with PowerBuilder Controls
You can use standard PowerBuilder objects to connect to OData feeds and execute queries. The following example shows how to retrieve Google Data Catalog data into a DataWindow.
You can add the following code to the open method:
SQLCA.DBMS = "ODT"
SQLCA.DBParm = "ConnectString='URI=http://MyServer:8032/api.rsc;UID=MyAPIUser;PWD=MyAuthtoken'";
CONNECT USING SQLCA;
dw_schemas.SetTransObject(SQLCA);
dw_schemas.Retrieve();
