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Connect to Open Exchange Rates Data in Ruby

Connect to Open Exchange Rates data in Ruby with ruby-dbi, dbd-odbc, and ruby-odbc.

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

Create an ODBC Connection to Open Exchange Rates 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.

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.

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 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:

#connect to the DSN require 'DBI' cnxn = DBI.connect('DBI:ODBC:CData OpenExchangeRates Source','','') #execute a SELECT query and store the result set resultSet = cnxn.execute("SELECT Id, Statistics_ViewCount FROM Projects") #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 Open Exchange Rates data with Ruby. To do so, simply run your file from the command line:

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