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Rapidly create and deploy powerful Java applications that integrate with MySQL-compatible database engines.

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Connect to MySQL Data in JRuby


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

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

Configure a JDBC Connection to MySQL 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 MySQL\lib).

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

The Server and Port properties must be set to a MySQL server. If IntegratedSecurity is set to false, then User and Password must be set to valid user credentials. Optionally, Database can be set to connect to a specific database. If not set, tables from all databases will be returned.

Built-in Connection String Designer

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

java -jar cdata.jdbc.mysql.jar

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

Below is a typical JDBC connection string for MySQL:

jdbc:mysql:User=myUser;Password=myPassword;Database=NorthWind;Server=myServer;Port=3306;

Create a JRuby App with Connectivity to MySQL Data

Create a new Ruby file (for example: MySQLSelect.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 MySQL 2018/lib/cdata.jdbc.mysql.jar' url = "jdbc:mysql:User=myUser;Password=myPassword;Database=NorthWind;Server=myServer;Port=3306;" conn = java.sql.DriverManager.getConnection(url) stmt = conn.createStatement rs = stmt.executeQuery("SELECT ShipName, Freight FROM Orders") while (rs.next) do puts rs.getString(1) + ' ' + rs.getString(2) end

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

jruby -S MySQLSelect.rb

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