MySQL Connection class for Java

package nl.nielsha.ebay.mysql;

import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;

public class Connection {
	// Proporties
	private String hostname;
	private String port;
	private String username;
	private String password;
	private String database;
	
	private java.sql.Connection connection;
	
	// Constructors
	public Connection()
	{
		this.hostname = "localhost";
		this.port = "3306";
		this.username = "";
		this.password = "";
	}
	
	public Connection(String username, String password, String database)
	{
		this.hostname = "localhost";
		this.port = "3306";
		this.username = username;
		this.password = password;
		this.database = database;
	}
	
	public Connection(String hostname, String username, String password, String database)
	{
		this.hostname = hostname;
		this.port = "3306";
		this.username = username;
		this.password = password;
		this.database = database;
	}
	
	public Connection(String hostname, String port, String username, String password, String database)
	{
		this.hostname = hostname;
		this.port = port;
		this.username = username;
		this.password = password;
		this.database = database;
	}
	
	// Functions
	public void connect()
	{
		String url = "jdbc:mysql://"+this.hostname+":"+this.port+"/"+this.database;
		try 
		{
			this.connection = DriverManager.getConnection(url, this.username, this.password);
		} catch(SQLException ex)
		{
			this.connection = null;
		}
	}
	
	public void disconnect()
	{
		try {
			this.connection.close();
		} catch (SQLException e) {
			this.connection = null;
		}
		this.connection = null;
	}
	
	public ResultSet preparedStatement(String query, ArrayList<Object> values) throws SQLException
	{
		if(!this.isConnected())
			this.connect();
		
		PreparedStatement ps = this.connection.prepareStatement(query);
		for(int i = 1; i <= values.size(); i++)
		{
			ps.setObject(i, values.get(i-1));
		}
		ps.execute();
		
		return ps.getResultSet();
	}
	
	public ResultSet query(String query) throws SQLException
	{
		if(!this.isConnected())
			this.connect();
		
		Statement sm = this.connection.createStatement();
		
		return sm.executeQuery(query);
	}
	
	public int updateQuery(String query) throws SQLException
	{
		if(this.isConnected())
			this.connect();
		
		Statement sm = this.connection.createStatement();
		
		return sm.executeUpdate(query);
	}
	
	// Getters and setters
	public String getHostname()
	{
		return this.hostname;
	}
	
	public void setHostname(String hostname)
	{
		this.hostname = hostname;
	}
	
	public String getPort()
	{
		return this.port;
	}
	
	public void setPort(String port)
	{
		this.port = port;
	}
	
	public String getUsername()
	{
		return this.username;
	}
	
	public void setUsername(String username)
	{
		this.username = username;
	}
	
	public String getPassword()
	{
		return this.password;
	}
	
	public void setPassword(String password)
	{
		this.password = password;
	}
	
	public String getDatabase()
	{
		return this.database;
	}
	
	public void setDatabase(String database)
	{
		this.database = database;
	}
	
	public java.sql.Connection getConnection()
	{
		return this.connection;
	}
	
	public boolean isConnected()
	{
		try {
			return this.connection != null && !this.connection.isClosed();
		} catch (SQLException e) {
			return false;
		}
	}

}