Mega Code Archive
Transaction Pairs 2
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/*
* 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:
*
* -Redistribution of source code must retain the above copyright notice, this
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*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* 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());
}
}
}
}
}
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