tickettag2.java

java2 primer plus一书源程序

/*
 * TicketTag2.java
 *
 * Created on July 13, 2002, 12:38 PM
 */

package com.samspublishing.jpp.ch27;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.*;
import java.sql.*;
import java.util.*;

/**
 *
 * @author  Stephen Potts
 * @version
 */
public class TicketTag2 extends TagSupport
{
   private String custIDString;
   //information about the customer
   private int custID;
   private String lastName;
   private String firstName;
   
   //information about the cruise
   private int cruiseID;
   private String destination;
   private String port;
   private String sailing;
   
   private int numberOfTickets;
   
   public int doStartTag()
   {
      retrieveFromDB();
      
      /*lastName = "Joe";
      firstName = "Burns";
      
      //information about the cruise
      cruiseID = 1001;
      destination = "Cuba";
      port = "Tampa";
      sailing = "1/1/03";
      numberOfTickets = 4;
       **/
      
      try
      {
         JspWriter out = pageContext.getOut();
         out.print("The custID that you entered = " + custID);
         out.print("<br>" );
         out.print("The Last Name = " + lastName);
         out.print("<br>" );
         out.print("The First Name = " + firstName);
         out.print("<br>" );
         out.print("The cruiseID = " + cruiseID);
         out.print("<br>" );
         out.print("The destination = " + destination);
         out.print("<br>" );
         out.print("The port = " + port);
         out.print("<br>" );
         out.print("The sailing = " + sailing);
         out.print("<br>" );
         out.print("The number of tickets = " + numberOfTickets);
      }catch (Exception e)
      {
         System.out.println("Error in TicketTag2 class" + e);
      }
      return(SKIP_BODY);
   }
   
   public void setCustID(String id)
   {
      this.custIDString=id;
      this.custID = Integer.parseInt(custIDString);
   }
   
   public String retrieveFromDB()
   {
      java.sql.Connection dbConn = null;
      Statement statement1 = null;
      String createStatement;
      String insertStatement;
      
      try
      {
         // ============== Make connection to database ==================
         
         //load the driver class
         Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
         
         //Specify the ODBC data source
         String sourceURL = "jdbc:odbc:TicketRequest";
         
         //get a connection to the database
         dbConn = DriverManager.getConnection(sourceURL);
         
         //If we get to here, no exception was thrown
         System.out.println("The database connection is " + dbConn);
         System.out.println("Making connection...\n");
         
         //Create the statement
         statement1 = dbConn.createStatement();
         
         
         //Populate the bean
         String getBeanString =
         "SELECT * FROM TicketRequest " +
         "WHERE CustID = " + custID;
         
         ResultSet results = statement1.executeQuery(getBeanString);
         
         while (results.next())
         {
            lastName = results.getString("lastName");
            firstName = results.getString("firstName");
            cruiseID = results.getInt("cruiseID");
            destination = results.getString("destination");
            port = results.getString("port");
            sailing = results.getString("sailing");
            numberOfTickets = results.getInt("numberOfTickets");
         }
         return "Successful Retrieval";
      } catch (Exception e)
      {
         System.out.println("Exception was thrown: " + e.getMessage());
         return "UnSuccessful Retrieval";
      } finally
      {
         try
         {
            if (statement1 != null)
               statement1.close();
            if (dbConn != null)
               dbConn.close();
         } catch (SQLException sqle)
         {
            System.out.println("SQLException during close(): " + sqle.getMessage());
         }
      }
      
   }
   
   
}