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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!
Ready to get started?
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Oracle ODBC Driver
The Oracle ODBC Driver is a powerful tool that allows you to connect with Oracle, directly from any applications that support ODBC connectivity.
Access Oracle databases from virtually anywhere through a standard ODBC Driver interface.
