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Connect to Open Exchange Rates Data in JRuby

Create a simple JRuby app with access to live Open Exchange Rates data.

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

Configure a JDBC Connection to Open Exchange Rates 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 Open Exchange Rates\lib).

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

The Open Exchange Rates API supports basic authentication with an App Id. After you register, your App Id is displayed in your account dashboard. Set this to the AppId connection property.

Built-in Connection String Designer

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

java -jar cdata.jdbc.openexchangerates.jar

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

Below is a typical JDBC connection string for Open Exchange Rates:


Create a JRuby App with Connectivity to Open Exchange Rates Data

Create a new Ruby file (for example: OpenExchangeRatesSelect.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 Open Exchange Rates 2018/lib/cdata.jdbc.openexchangerates.jar' url = "jdbc:openexchangerates:AppId=abc1234;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT Id, Statistics_ViewCount FROM Projects") while ( do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S OpenExchangeRatesSelect.rb

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