Connect to Greenhouse Data in JRuby

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

Configure a JDBC Connection to Greenhouse 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 Greenhouse\lib).

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

You need an API key to connect to Greenhouse. To create an API key, follow the steps below:

1. Click the Configure icon in the navigation bar and locate Dev Center on the left.
2. Select API Credential Management.
3. Click Create New API Key.
• Set "API Type" to Harvest.
• Set "Partner" to custom.
• Optionally, provide a description.
4. Proceed to Manage permissions and select the appropriate permissions based on the resources you want to access through the driver.
5. Copy the created key and set APIKey to that value.

Built-in Connection String Designer

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

java -jar cdata.jdbc.greenhouse.jar

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

Below is a typical JDBC connection string for Greenhouse:

jdbc:greenhouse:APIKey=YourAPIKey;

Create a JRuby App with Connectivity to Greenhouse Data

Create a new Ruby file (for example: GreenhouseSelect.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 Greenhouse 2018/lib/cdata.jdbc.greenhouse.jar'

url = "jdbc:greenhouse:APIKey=YourAPIKey;"
conn = java.sql.DriverManager.getConnection(url)
stmt = conn.createStatement
rs = stmt.executeQuery("SELECT Id, CandidateId FROM Applications")
while (rs.next) do
 puts rs.getString(1) + ' ' + rs.getString(2)
end

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

jruby -S GreenhouseSelect.rb

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