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Connect to Cloudant Data in JRuby

Create a simple JRuby app with access to live Cloudant data.

JRuby is a high-performance, stable, fully threaded Java implementation of the Ruby programming language. The CData JDBC Driver for Cloudant makes it easy to integrate connectivity to live Cloudant data in JRuby. This article shows how to create a simple JRuby app that connects to Cloudant data, executes a query, and displays the results.

Configure a JDBC Connection to Cloudant Data

Before creating the app, note the installation location for the JAR file for the JDBC Driver (typically C:\Program Files\CData\CData JDBC Driver for Cloudant\lib).

JRuby natively supports JDBC, so you can easily connect to Cloudant and execute SQL queries. Initialize the JDBC connection with the getConnection function of the java.sql.DriverManager class.

Set the following connection properties to connect to Cloudant:

  • User: Set this to your username.
  • Password: Set this to your password.

Built-in Connection String Designer

For assistance in constructing the JDBC URL, use the connection string designer built into the Cloudant JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

java -jar cdata.jdbc.cloudant.jar

Fill in the connection properties and copy the connection string to the clipboard.

Below is a typical JDBC connection string for Cloudant:

jdbc:cloudant:User=abc123; Password=abcdef;

Create a JRuby App with Connectivity to Cloudant Data

Create a new Ruby file (for example: CloudantSelect.rb) and open it in a text editor. Copy the following code into your file:

require 'java' require 'rubygems' require 'C:/Program Files/CData/CData JDBC Driver for Cloudant 2018/lib/cdata.jdbc.cloudant.jar' url = "jdbc:cloudant:User=abc123; Password=abcdef;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT MovieRuntime, MovieRating FROM Movies") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

With the file completed, you are ready to display your Cloudant data with JRuby. To do so, simply run your file from the command line:

jruby -S CloudantSelect.rb

Writing SQL-92 queries to Cloudant allows you to quickly and easily incorporate Cloudant data into your own JRuby applications. Download a free trial today!