http://dev.mysql.com/downloads/connector/j/

At Linux Box:

nano JDBCExample.java
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
 
public class JDBCExample {
 
  public static void main(String[] argv) {
 
	System.out.println("-------- MySQL JDBC Connection Testing ------------");
 
	try {
		Class.forName("com.mysql.jdbc.Driver");
	} catch (ClassNotFoundException e) {
		System.out.println("Where is your MySQL JDBC Driver?");
		e.printStackTrace();
		return;
	}
 
	System.out.println("MySQL JDBC Driver Registered!");
	Connection connection = null;
 
	try {
		connection = DriverManager
		.getConnection("jdbc:mysql://192.168.0.64:3306/classicmodels","root", "password");
 
	} catch (SQLException e) {
		System.out.println("Connection Failed! Check output console");
		e.printStackTrace();
		return;
	}
 
	if (connection != null) {
		System.out.println("You made it, take control your database now!");
	} else {
		System.out.println("Failed to make connection!");
	}
  }
}
javac -classpath .:mysql-connector-java-5.1.34-bin.jar JDBCExample.java

java  -classpath .:mysql-connector-java-5.1.34-bin.jar  JDBCExample

copy mysql-connector-java-5.1.34-bin.jar and JDBCExample.class into Yun.

root@Arduino:/mnt/sda1# jamvm  -classpath .:mysql-connector-java-5.1.34-bin.jar
 JDBCExample
-------- MySQL JDBC Connection Testing ------------
MySQL JDBC Driver Registered!
You made it, take control your database now!