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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!
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MongoDB ODBC Driver
The MongoDB ODBC Driver is a powerful tool that allows you to connect with live MongoDB document databases, directly from any applications that support ODBC connectivity.
Access MongoDB like you would a database - read, write, and update through a standard ODBC Driver interface.
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