Connect to DB2 Data in Ruby

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IBM DB2 ODBC Driver

The IBM DB2 ODBC Driver is a powerful tool that allows you to connect with live data from IBM DB2, directly from any applications that support ODBC connectivity.

Access IBM DB2 data like you would a database - read, write, and update through a standard ODBC Driver interface.



Connect to DB2 data in Ruby with ruby-dbi, dbd-odbc, and ruby-odbc.

The CData ODBC Driver for DB2 makes it easy to integrate connectivity to live DB2 data in Ruby. This article shows how to create a simple Ruby app that connects to DB2 data, executes a query, and displays the results.

Create an ODBC Connection to DB2 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.

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 DB2 Data

Create a new Ruby file (for example: DB2Select.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 DB2 Source','','') #execute a SELECT query and store the result set resultSet = cnxn.execute("SELECT Orders.Freight, Customers.ContactName FROM Customers INNER JOIN Orders ON Customers.CustomerId=Orders.CustomerId") #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 DB2 data with Ruby. To do so, simply run your file from the command line:

ruby DB2Select.rb Writing SQL-92 queries to DB2 allows you to quickly and easily incorporate DB2 data into your own Ruby applications. Download a free trial today!