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Connect to Cosmos DB Data in Ruby
Connect to Cosmos DB data in Ruby with ruby-dbi, dbd-odbc, and ruby-odbc.
The CData ODBC Driver for Cosmos DB makes it easy to integrate connectivity to live Cosmos DB data in Ruby. This article shows how to create a simple Ruby app that connects to Cosmos DB data, executes a query, and displays the results.
Create an ODBC Connection to Cosmos DB 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 obtain the connection string needed to connect to a Cosmos DB account using the SQL API, log in to the Azure Portal, select Azure Cosmos DB, and select your account. In the Settings section, click Connection String and set the following values:
- AccountEndpoint: The Cosmos DB account URL from the Keys blade of the Cosmos DB account
- AccountKey: In the Azure portal, navigate to the Cosmos DB service and select your Azure Cosmos DB account. From the resource menu, go to the Keys page. Find the PRIMARY KEY value and set AccountKey to this value.
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 Cosmos DB Data
Create a new Ruby file (for example: CosmosDBSelect.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 CosmosDB Source','','')
#execute a SELECT query and store the result set
resultSet = cnxn.execute("SELECT City, CompanyName FROM Customers")
#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 Cosmos DB data with Ruby. To do so, simply run your file from the command line:
ruby CosmosDBSelect.rb
Writing SQL-92 queries to Cosmos DB allows you to quickly and easily incorporate Cosmos DB data into your own Ruby applications. Download a free trial today!
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Cosmos DB ODBC Driver
The Cosmos DB ODBC Driver is a powerful tool that allows you to connect with live Cosmos DB document databases, directly from any applications that support ODBC connectivity.
Access Cosmos DB like you would a database - read, write, and update through a standard ODBC Driver interface.
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