Another Example of Transaction Paris

package com.sun.example;
 
/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
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 * -Redistribution in binary form must reproduce the above copyright notice,
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 *  and/or other materials provided with the distribution.
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 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
public class TransactionPairs {
 
    public static void main(String args[]) {
 
	String url = "jdbc:mySubprotocol:myDataSource";
	Connection con = null;
	Statement stmt;
	PreparedStatement updateSales;
	PreparedStatement updateTotal;
	String updateString = "update COFFEES " + "set SALES = ? where COF_NAME like ?";
 
	String updateStatement = "update COFFEES " + "set TOTAL = TOTAL + ? where COF_NAME like ?";
	String query = "select COF_NAME, SALES, TOTAL from COFFEES";
 
	try {
	    Class.forName("myDriver.ClassName");
 
	} catch (java.lang.ClassNotFoundException e) {
	    System.err.print("ClassNotFoundException: ");
	    System.err.println(e.getMessage());
	}
 
	try {
 
	    con = DriverManager.getConnection(url, "myLogin", "myPassword");
 
	    updateSales = con.prepareStatement(updateString);
	    updateTotal = con.prepareStatement(updateStatement);
	    int[] salesForWeek = { 175, 150, 60, 155, 90 };
	    String[] coffees = { "Colombian", "French_Roast", "Espresso", "Colombian_Decaf", "French_Roast_Decaf" };
	    int len = coffees.length;
	    con.setAutoCommit(false);
	    for (int i = 0; i < len; i++) {
		updateSales.setInt(1, salesForWeek[i]);
		updateSales.setString(2, coffees[i]);
		updateSales.executeUpdate();
 
		updateTotal.setInt(1, salesForWeek[i]);
		updateTotal.setString(2, coffees[i]);
		updateTotal.executeUpdate();
		con.commit();
	    }
 
	    con.setAutoCommit(true);
 
	    updateSales.close();
	    updateTotal.close();
 
	    stmt = con.createStatement();
	    ResultSet rs = stmt.executeQuery(query);
 
	    while (rs.next()) {
		String c = rs.getString("COF_NAME");
		int s = rs.getInt("SALES");
		int t = rs.getInt("TOTAL");
		System.out.println(c + "     " + s + "    " + t);
	    }
 
	    stmt.close();
	    con.close();
 
	} catch (SQLException ex) {
	    System.err.println("SQLException: " + ex.getMessage());
	    if (con != null) {
		try {
		    System.err.print("Transaction is being ");
		    System.err.println("rolled back");
		    con.rollback();
		} catch (SQLException excep) {
		    System.err.print("SQLException: ");
		    System.err.println(excep.getMessage());
		}
	    }
	}
    }
}