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Connect to HPCC Systems Data in JRuby

Create a simple JRuby app with access to live HPCC Systems data.

JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for HPCC Systems makes it easy to integrate connectivity to live HPCC Systems data in JRuby. This article shows how to create a simple JRuby app that connects to HPCC Systems data, executes a query, and displays the results.

Configure a JDBC Connection to HPCC Systems Data

Before creating the app, note the installation location for the JAR file for the JDBC Driver (typically C:\Program Files\CData\CData JDBC Driver for HPCC Systems\lib).

JRuby natively supports JDBC, so you can easily connect to HPCC Systems and execute SQL queries. Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.

To connect, set the following connection properties: Set URL to the machine name or IP address of the server and the port the server is running on, for example, https://server:port. The User and Password are required to authenticate to the HPCC Systems cluster specified in the URL. Note that LDAP authentication is not currently supported by our ODBC driver.

Set Version to the WsSQL Web server version. Note that if you have not already done so, you will need to install the WsSQL service on the HPCC Systems server. The WsSQL Web service is used to interact with the underlying HPCC Systems platform.

Set Cluster to the target cluster.

Built-in Connection String Designer

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

java -jar cdata.jdbc.hpcc.jar

Fill in the connection properties and copy the connection string to the clipboard.

Below is a typical JDBC connection string for HPCC Systems:

jdbc:hpcc:URL=http://127.0.0.1:8510;User=test;password=xA123456;Version=1;Cluster=hthor;

Create a JRuby App with Connectivity to HPCC Systems Data

Create a new Ruby file (for example: HPCCSelect.rb) and open it in a text editor. Copy the following code into your file:

require 'java' require 'rubygems' require 'C:/Program Files/CData/CData JDBC Driver for HPCC Systems 2018/lib/cdata.jdbc.hpcc.jar' url = "jdbc:hpcc:URL=http://127.0.0.1:8510;User=test;password=xA123456;Version=1;Cluster=hthor;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT CustomerName, Price FROM hpcc::test::orders") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

With the file completed, you are ready to display your HPCC Systems data with JRuby. To do so, simply run your file from the command line:

jruby -S HPCCSelect.rb

Writing SQL-92 queries to HPCC Systems allows you to quickly and easily incorporate HPCC Systems data into your own JRuby applications. Download a free trial today!