Transaction Pairs : Transaction « Database SQL JDBC « Java






Transaction Pairs

 
/*
Copyright 2003 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
Use of this software is authorized pursuant to the terms of the license found at
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Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.  
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*/

/*
 * Copyright 2003 Sun Microsystems, Inc.  ALL RIGHTS RESERVED.
 * Use of this software is authorized pursuant to the terms of the license found at
 * http://developer.java.sun.com/berkeley_license.html.
 */ 

import java.sql.*;

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 = ?";

    String updateStatement = "update COFFEES " +
        "set TOTAL = TOTAL + ? where COF_NAME = ?";
    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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