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Connect to Oracle Data in JRuby

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

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

Configure a JDBC Connection to Oracle 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 Oracle\lib).

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

To connect to Oracle, you'll first need to update your PATH variable and ensure it contains a folder location that includes the native DLLs. The native DLLs can be found in the lib folder inside the installation directory. Once you've done this, set the following to connect:

  • Port: The port used to connect to the server hosting the Oracle database.
  • User: The user Id provided for authentication with the Oracle database.
  • Password: The password provided for authentication with the Oracle database.
  • Service Name: The service name of the Oracle database.

Built-in Connection String Designer

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

java -jar cdata.jdbc.oracleoci.jar

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

Below is a typical JDBC connection string for Oracle:

jdbc:oracleoci:User=myuser;Password=mypassword;Server=localhost;Port=1521;

Create a JRuby App with Connectivity to Oracle Data

Create a new Ruby file (for example: OracleOCISelect.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 Oracle 2018/lib/cdata.jdbc.oracleoci.jar' url = "jdbc:oracleoci:User=myuser;Password=mypassword;Server=localhost;Port=1521;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT CompanyName, City FROM Customers") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S OracleOCISelect.rb

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