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Connect to HDFS Data from PowerBuilder


This article demonstrates how to access HDFS data from PowerBuilder using the HDFS JDBC Driver.

The CData JDBC Driver for HDFS is a standards-based control that can be used from any platform or development technology that supports JDBC, including PowerBuilder. This article shows how to use the CData JDBC Driver for HDFS in PowerBuilder.

This article shows how to create a basic PowerBuilder application that uses the CData JDBC Driver for HDFS to retrieve data.

Connect to HDFS Data from PowerBuilder

Follow the steps below to use the Database Painter tool to create a database profile based on an JDBC URL for HDFS. You can use a database profile to save connection properties. In the Database Painter, you can graphically manipulate data as well as execute SQL queries.

  1. Add the driver JAR to the PowerBuilder classpath. Set the CLASSPATH system environment variable to the path to the driver JAR, located in the lib subfolder of the installation directory.

    Note: If you are using PowerBuilder Classic, you can also add the path to the driver JAR by clicking Tools -> System Options -> Java.

  2. Click Tools -> Database Painter.
  3. Right-click the JDBC node and click New Profile.
  4. In the Database Profile Setup dialog, enter the following:
    • Profile Name: Enter a user-friendly name for the profile.
    • Driver Name: Enter the class name of the driver, cdata.jdbc.hdfs.HDFSDriver
    • URL: Enter the JDBC URL.

      In order to authenticate, set the following connection properties:

      • Host: Set this value to the host of your HDFS installation.
      • Port: Set this value to the port of your HDFS installation. Default port: 50070

      Built-in Connection String Designer

      For assistance in constructing the JDBC URL, use the connection string designer built into the HDFS JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

      java -jar cdata.jdbc.hdfs.jar

      Fill in the connection properties and copy the connection string to the clipboard. A typical JDBC URL is below:

      jdbc:hdfs:Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;User=root;
  5. To view and modify a table, right-click a table and then click Edit Data -> Grid.

Using HDFS Data with PowerBuilder Controls

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

SQLCA.DBMS = "JDBC" SQLCA.AutoCommit = False SQLCA.DBParm = "Driver='cdata.jdbc.hdfs.HDFSDriver',URL='jdbc:hdfs:Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;User=root;"; CONNECT USING SQLCA; dw_files.SetTransObject(SQLCA); dw_files.Retrieve();