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Connect to Quandl Data in Ruby

Connect to Quandl data in Ruby with ruby-dbi, dbd-odbc, and ruby-odbc.

The CData ODBC Driver for Quandl makes it easy to integrate connectivity to live Quandl data in Ruby. This article shows how to create a simple Ruby app that connects to Quandl data, executes a query, and displays the results.

Create an ODBC Connection to Quandl Data

If you have not already, first specify connection properties in an ODBC DSN (data source name). This is the last step of the driver installation. You can use the Microsoft ODBC Data Source Administrator to create and configure ODBC DSNs.

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.

Installing Ruby and Necessary Gems

If you do not have Ruby installed, refer to the Ruby installation page. With Ruby installed, you will need to install the ruby-dbi, dbd-odbc, and ruby-odbc gems:

gem install dbi gem install dbd-odbc gem install ruby-odbc

Create a Ruby 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:

#connect to the DSN require 'DBI' cnxn = DBI.connect('DBI:ODBC:CData Quandl Source','','') #execute a SELECT query and store the result set resultSet = cnxn.execute("SELECT Date, Volume FROM AAPL") #display the names of the columns resultSet.column_names.each do |name| print name, "\t" end puts #display the results while row = resultSet.fetch do (0..resultSet.column_names.size - 1).each do |n| print row[n], "\t" end puts end resultSet.finish #close the connection cnxn.disconnect if cnxn

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

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