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Connect to Cassandra Data in Ruby

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

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

Create an ODBC Connection to Cassandra 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.

Set the Server, Port, and Database connection properties to connect to Cassandra. Additionally, to use internal authentication set the User and Password connection properties.

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 Cassandra Data

Create a new Ruby file (for example: CassandraSelect.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 Cassandra Source','','') #execute a SELECT query and store the result set resultSet = cnxn.execute("SELECT City, SUM(TotalDue) FROM Customer GROUP BY City") #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 Cassandra data with Ruby. To do so, simply run your file from the command line:

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