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Connect to Greenplum Data in JRuby
Create a simple JRuby app with access to live Greenplum data.
JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for Greenplum makes it easy to integrate connectivity to live Greenplum data in JRuby. This article shows how to create a simple JRuby app that connects to Greenplum data, executes a query, and displays the results.
Configure a JDBC Connection to Greenplum 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 Greenplum\lib).
JRuby natively supports JDBC, so you can easily connect to Greenplum and execute SQL queries. Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.
To connect to Greenplum, set the Server, Port (the default port is 5432), and Database connection properties and set the User and Password you wish to use to authenticate to the server. If the Database property is not specified, the default database for the authenticate user is used.
Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the Greenplum JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.greenplum.jar
Fill in the connection properties and copy the connection string to the clipboard.
Below is a typical JDBC connection string for Greenplum:
jdbc:greenplum:User=user;Password=admin;Database=dbname;Server=127.0.0.1;Port=5432;
Create a JRuby App with Connectivity to Greenplum Data
Create a new Ruby file (for example: GreenplumSelect.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 Greenplum 2018/lib/cdata.jdbc.greenplum.jar'
url = "jdbc:greenplum:User=user;Password=admin;Database=dbname;Server=127.0.0.1;Port=5432;"
conn = java.sql.DriverManager.getConnection(url)
stmt = conn.createStatement
rs = stmt.executeQuery("SELECT Freight, ShipName FROM Orders")
while (rs.next) do
puts rs.getString(1) + ' ' + rs.getString(2)
end
With the file completed, you are ready to display your Greenplum data with JRuby. To do so, simply run your file from the command line:
jruby -S GreenplumSelect.rb
Writing SQL-92 queries to Greenplum allows you to quickly and easily incorporate Greenplum data into your own JRuby applications. Download a free trial today!
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