Connect to XML Data from PowerBuilder

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XML ODBC Driver

The XML ODBC Driver is a powerful tool that allows you to connect with live XML data stores, directly from any applications that support ODBC connectivity.

Access XML data like you would any standard database - read, write, and update etc. through a standard ODBC Driver interface.



This article demonstrates how to use the CData ODBC Driver for XML to connect to XML data and execute queries in PowerBuilder.

The CData ODBC Driver for XML can be used from any platform or development technology that supports ODBC, including PowerBuilder. This article shows how to connect to XML data and execute queries from the Database Painter and controls such as the DataWindow.

Connect to XML as an ODBC Data Source

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs.

See the Getting Started chapter in the data provider documentation to authenticate to your data source: The data provider models XML APIs as bidirectional database tables and XML files as read-only views (local files, files stored on popular cloud services, and FTP servers). The major authentication schemes are supported, including HTTP Basic, Digest, NTLM, OAuth, and FTP. See the Getting Started chapter in the data provider documentation for authentication guides.

After setting the URI and providing any authentication values, set DataModel to more closely match the data representation to the structure of your data.

The DataModel property is the controlling property over how your data is represented into tables and toggles the following basic configurations.

  • Document (default): Model a top-level, document view of your XML data. The data provider returns nested elements as aggregates of data.
  • FlattenedDocuments: Implicitly join nested documents and their parents into a single table.
  • Relational: Return individual, related tables from hierarchical data. The tables contain a primary key and a foreign key that links to the parent document.

See the Modeling XML Data chapter for more information on configuring the relational representation. You will also find the sample data used in the following examples. The data includes entries for people, the cars they own, and various maintenance services performed on those cars.

Create a Profile for the ODBC Driver for XML

Follow the steps below to use the Database Painter tool to create a database profile based on an ODBC DSN (data source name) for XML. In the Database Painter, you can use wizards and the UI to work with XML data.

  1. In PowerBuilder, click Tools -> Database Painter.
  2. In the Objects window in the Database Painter, right-click the ODBC node and click New Profile.
  3. On the Connection tab, enter a name for the profile and select the XML DSN in the Data Source menu.
  4. To view and modify a table, right-click a table and then click Edit Data -> Grid.

Using XML Data with PowerBuilder Controls

You can use standard PowerBuilder objects to connect to ODBC data sources and execute queries. The following example shows how to retrieve XML data into a DataWindow. You can add the following code to the open method:

SQLCA.DBMS = "ODBC" SQLCA.DBParm = "ConnectString='DSN=CData XML Source'" CONNECT USING SQLCA; dw_people.SetTransObject(SQLCA); dw_people.Retrieve();