Connect to Mailgun Data in JRuby

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

Configure a JDBC Connection to Mailgun 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 Mailgun\lib).

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

Start by setting the Profile connection property to the location of the Mailgun Profile on disk (e.g. C:\profiles\Mailgun.apip). Next, set the ProfileSettings connection property to the connection string for Mailgun (see below).

Mailgun API Profile Settings

Generate an API key in your Mailgun account by selecting Account Settings > API Security > Create Key from the account dropdown menu.

Built-in Connection String Designer

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

java -jar cdata.jdbc.api.jar

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

Below is a typical JDBC connection string for Mailgun:

jdbc:api:Profile=C:\profiles\Mailgun.apip;ProfileSettings='Password=your_api_key';

Create a JRuby App with Connectivity to Mailgun Data

Create a new Ruby file (for example: APISelect.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 Mailgun 2018/lib/cdata.jdbc.api.jar'

url = "jdbc:api:Profile=C:\profiles\Mailgun.apip;ProfileSettings='Password=your_api_key';"
conn = java.sql.DriverManager.getConnection(url)
stmt = conn.createStatement
rs = stmt.executeQuery("SELECT Type, Value FROM Allowlists")
while (rs.next) do
  puts rs.getString(1) + ' ' + rs.getString(2)
end

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

jruby -S APISelect.rb

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