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Connect to MongoDB Data in Ruby

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

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

Create an ODBC Connection to MongoDB 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, Database, User, and Password connection properties to connect to MongoDB. To access MongoDB collections as tables you can use automatic schema discovery or write your own schema definitions. Schemas are defined in .rsd files, which have a simple format. You can also execute free-form queries that are not tied to the schema.

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 MongoDB Data

Create a new Ruby file (for example: MongoDBSelect.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 MongoDB Source','','') #execute a SELECT query and store the result set resultSet = cnxn.execute("SELECT borough, cuisine FROM restaurants") #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 MongoDB data with Ruby. To do so, simply run your file from the command line:

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