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Connect to Oracle Data in Ruby

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

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

Create an ODBC Connection to Oracle 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.

To connect to Oracle, you'll first need to update your PATH variable and ensure it contains a folder location that includes the native DLLs. The native DLLs can be found in the lib folder inside the installation directory. Once you've done this, set the following to connect:

  • Port: The port used to connect to the server hosting the Oracle database.
  • User: The user Id provided for authentication with the Oracle database.
  • Password: The password provided for authentication with the Oracle database.
  • Service Name: The service name of the Oracle database.

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 Oracle Data

Create a new Ruby file (for example: OracleOCISelect.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 OracleOCI Source','','') #execute a SELECT query and store the result set resultSet = cnxn.execute("SELECT CompanyName, City FROM Customers WHERE Country = US") #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 Oracle data with Ruby. To do so, simply run your file from the command line:

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