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Connect to Quandl Data in JRuby

Create a simple JRuby app with access to live Quandl data.

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

Configure a JDBC Connection to Quandl 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 Quandl\lib).

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

Quandl uses an API key for authentication. See the help documentation for a guide to obtaining the APIKey property.

Additionally, set the DatabaseCode connection property to the code identifying the Database whose Datasets you want to query with SQL. You can search the available Databases by querying the Databases view.

Built-in Connection String Designer

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

java -jar cdata.jdbc.quandl.jar

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

Below is a typical JDBC connection string for Quandl:

jdbc:quandl:APIKey=abc123;DatabaseCode=WIKI;

Create a JRuby App with Connectivity to Quandl Data

Create a new Ruby file (for example: QuandlSelect.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 Quandl 2018/lib/cdata.jdbc.quandl.jar' url = "jdbc:quandl:APIKey=abc123;DatabaseCode=WIKI;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT Date, Volume FROM AAPL") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S QuandlSelect.rb

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