582 lines
19 KiB
HTML
582 lines
19 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: Using ToolboxME for iSeries, MIDP, and JDBC" />
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<meta name="abstract" content="" />
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<meta name="description" content="" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="microsamplerealestate" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Using ToolboxME for iSeries, MIDP, and JDBC</title>
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</head>
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<body id="microsamplerealestate"><a name="microsamplerealestate"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Using ToolboxME for iSeries, MIDP, and JDBC</h1>
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<div><p></p>
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<div class="section"><p>The following source illustrates one way that your ToolboxME for iSeries™ application
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can use the <a href="microconcept.htm#microconcept__profiles">Mobile
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Information Device Profile (MIDP)</a> and JDBC to access a database and
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store information offline.</p>
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<p>This example demonstrates how a real estate
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agent might be able to view and bid on properties that are currently for
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sale. The agent uses a <a href="microconcept.htm#microconcept__tier0">Tier0
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device</a> to access information for the properties, which is stored in
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the iSeries server
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database.</p>
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<p>When built as a working program, the example code below connects
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to a database created for this purpose.</p>
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<p>To create a working version
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of the source code and to obtain the source for creating and populating the
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required database, you must <a href="microexamplesdownload.htm#microexamplesdownload">download
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the example</a>. You also may want to review the <a href="microfirstprog.htm#microfirstprog__createprogram">instructions
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for creating and running the example program</a>.</p>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm#codedisclaimer">Code example disclaimer</a> for
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important legal information.</div>
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<pre>//////////////////////////////////////////////////////////////////////////////////
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//
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// ToolboxME for iSeries example. This program is an example MIDlet that shows how
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// you might code a JdbcMe application for the MIDP profile. Refer to the
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// startApp, pauseApp, destroyApp and commandAction methods to see how it handles
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// each requested transition.
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//
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//////////////////////////////////////////////////////////////////////////////////
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import javax.microedition.midlet.*;
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import javax.microedition.lcdui.*;
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import java.sql.*;
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import javax.microedition.rms.*;
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import com.ibm.as400.micro.*;
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public class JdbcMidpBid extends MIDlet implements CommandListener
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{
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private static int BID_PROPERTY = 0;
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private Display display;
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private TextField urlText = new TextField("urltext",
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"jdbc:as400://mySystem;user=myUid;password=myPwd;",
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65,
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TextField.ANY);
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private TextField jdbcmeText = new TextField("jdbcmetext", "meserver=myMEServer", 40, TextField.ANY);
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private TextField jdbcmeTraceText = new TextField("jdbcmetracetext", "0", 10, TextField.ANY);
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private final static String GETBIDS = "No bids are available, select here to download bids";
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private List main = new List("JdbcMe Bid Demo", Choice.IMPLICIT);
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private List listings = null;
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private Form aboutBox;
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private Form bidForm;
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private Form settingsForm;
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private int bidRow = 0;
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private String bidTarget = null;
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private String bidTargetKey = null;
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private TextField bidText = new TextField("bidtext", "", 10, TextField.NUMERIC);
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private Form errorForm = null;
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private Command exitCommand = new Command("Exit", Command.SCREEN, 0);
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private Command backCommand = new Command("Back", Command.SCREEN, 0);
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private Command cancelCommand = new Command("Cancel", Command.SCREEN, 0);
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private Command goCommand = new Command("Go", Command.SCREEN, 1);
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private Displayable onErrorGoBackTo = null;
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/*
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* Construct a new JdbcMidpBid.
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*/
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public JdbcMidpBid()
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{
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display = Display.getDisplay(this);
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}
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/**
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* Show the main screen
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*/
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public void startApp()
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{
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main.append("Show Bids", null);
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main.append("Get New Bids", null);
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main.append("Settings", null);
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main.append("About", null);
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main.addCommand(exitCommand);
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main.setCommandListener(this);
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display.setCurrent(main);
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}
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public void commandAction(Command c, Displayable s)
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{
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// All exitCommand processing is the same.
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if (c == exitCommand)
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{
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destroyApp(false);
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notifyDestroyed();
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return;
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}
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if (s instanceof List)
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{
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List current = (List)s;
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// An action occurred on the main page
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if (current == main)
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{
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int idx = current.getSelectedIndex();
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switch (idx)
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{
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case 0: // Show current bids
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showBids();
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break;
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case 1: // Get New Bids
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getNewBids();
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break;
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case 2: // Settings
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doSettings();
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break;
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case 3: // About
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aboutBox();
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break;
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default :
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break;
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}
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return;
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} // current == main
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// An action occurred on the listings page
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if (current == listings)
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{
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if (c == backCommand)
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{
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display.setCurrent(main);
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return;
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}
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if (c == List.SELECT_COMMAND)
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{
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int idx = listings.getSelectedIndex();
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String stext = listings.getString(idx);
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if (stext.equals(GETBIDS))
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{
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getNewBids();
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return;
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}
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int commaIdx = stext.indexOf(',');
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bidTargetKey = stext.substring(0, commaIdx);
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bidTarget = stext.substring(commaIdx+1) + "\n";
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// Also keep track of which offline result set row
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// This is. It happens to be the same as the index
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// in the list.
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bidRow = idx;
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bidOnProperty();
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}
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} // current == listings
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return;
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} // instanceof List
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if (s instanceof Form)
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{
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Form current = (Form)s;
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if (current == errorForm)
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{
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if (c == backCommand)
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display.setCurrent(onErrorGoBackTo);
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return;
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} // errorForm
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if (current == settingsForm)
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{
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if (c == backCommand)
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{
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// Done with settings.
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display.setCurrent(main);
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settingsForm = null;
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return;
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}
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} // settingsForm
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if (current == aboutBox)
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{
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if (c == backCommand)
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{
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// Done with about box.
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display.setCurrent(main);
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aboutBox = null;
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return;
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}
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}
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if (current == bidForm)
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{
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if (c == cancelCommand)
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{
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display.setCurrent(listings);
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bidForm = null;
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return;
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}
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if (c == goCommand)
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{
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submitBid();
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if (display.getCurrent() != bidForm)
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{
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// If we're no longer positioned at the
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// bidForm, we will get rid of it.
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bidForm = null;
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}
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return;
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}
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return;
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} // current == bidForm
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} // instanceof Form
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}
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public void aboutBox()
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{
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aboutBox = new Form("aboutbox");
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aboutBox.setTitle("About");
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aboutBox.append(new StringItem("", "Midp RealEstate example for JdbcMe "));
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aboutBox.addCommand(backCommand);
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aboutBox.setCommandListener(this);
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display.setCurrent(aboutBox);
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}
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/**
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* The settings form.
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*/
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public void doSettings()
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{
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settingsForm = new Form("settingsform");
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settingsForm.setTitle("Settings");
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settingsForm.append(new StringItem("", "DB URL"));
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settingsForm.append(urlText);
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settingsForm.append(new StringItem("", "JdbcMe server"));
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settingsForm.append(jdbcmeText);
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settingsForm.append(new StringItem("", "Trace"));
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settingsForm.addCommand(backCommand);
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settingsForm.setCommandListener(this);
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display.setCurrent(settingsForm);
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}
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/**
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* Show the bid screen for the bid target
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* that we selected.
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*/
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public void bidOnProperty()
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{
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StringItem item = new StringItem("", bidTarget);
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bidText = new TextField("bidtext", "", 10, TextField.NUMERIC);
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bidText.setString("");
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bidForm = new Form("bidform");
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bidForm.setTitle("Submit a bid for:");
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BID_PROPERTY = 0;
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bidForm.append(item);
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bidForm.append(new StringItem("", "Your bid:"));
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bidForm.append(bidText);
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bidForm.addCommand(cancelCommand);
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bidForm.addCommand(goCommand);
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bidForm.setCommandListener(this);
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display.setCurrent(bidForm);
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}
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/**
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* Update the listings card with the
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* current list of bids that we are interested in.
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*/
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public void getNewBids()
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{
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// Reset the old listing
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listings = null;
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listings = new List("JdbcMe Bids", Choice.IMPLICIT);
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java.sql.Connection conn = null;
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Statement stmt = null;
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try
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{
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conn = DriverManager.getConnection(urlText.getString() + ";" + jdbcmeText.getString());
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stmt = conn.createStatement();
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// Since we do not want the prepared statement to persist,
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// a normal statement is really better in this environemnt.
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String sql = "select mls, address, currentbid from qjdbcme.realestate where currentbid <> 0";
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boolean results =((JdbcMeStatement)stmt).executeToOfflineData(sql,
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"JdbcMidpBidListings",
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0,
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0);
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if (results)
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{
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setupListingsFromOfflineData();
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}
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else
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{
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listings.append("No bids found", null);
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listings.addCommand(backCommand);
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listings.setCommandListener(this);
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}
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}
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catch (Exception e)
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{
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// Currently no valid listings retrieved, so lets
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// reset it to empty.
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listings = new List("JdbcMe Bids", Choice.IMPLICIT);
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listings.append(GETBIDS, null);
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listings.addCommand(backCommand);
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listings.setCommandListener(this);
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// Return to main after showing the error.
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showError(main, e);
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return;
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}
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finally
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{
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if (conn != null)
|
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{
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try
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{
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conn.close();
|
||
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}
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||
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catch (Exception e)
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||
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{
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||
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}
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||
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}
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conn = null;
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stmt = null;
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||
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}
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showBids();
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}
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||
|
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public void setupListingsFromOfflineData()
|
||
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{
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||
|
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// Skip the first four rows in the record store
|
||
|
|
// (eyecatcher, version, num columns, sql column
|
||
|
|
// types)
|
||
|
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// and each subsequent row in the record store is
|
||
|
|
// a single column. Our query returns 3 columns which
|
||
|
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// we will return concatenated as a single string.
|
||
|
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ResultSet rs = null;
|
||
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listings.addCommand(backCommand);
|
||
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listings.setCommandListener(this);
|
||
|
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try
|
||
|
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{
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int i = 5;
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int max = 0;
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||
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StringBuffer buf = new StringBuffer(20);
|
||
|
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|
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// Creator and dbtype unused in MIDP
|
||
|
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rs = new JdbcMeOfflineResultSet("JdbcMidpBidListings", 0, 0);
|
||
|
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if (rs == null)
|
||
|
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{
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||
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// New listings...
|
||
|
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listings = new List("JdbcMe Bids", Choice.IMPLICIT);
|
||
|
|
listings.append(GETBIDS, null);
|
||
|
|
listings.addCommand(backCommand);
|
||
|
|
listings.setCommandListener(this);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
i = 0;
|
||
|
|
String s = null;
|
||
|
|
while (rs.next())
|
||
|
|
{
|
||
|
|
++i;
|
||
|
|
|
||
|
|
s = rs.getString(1);
|
||
|
|
buf.append(s);
|
||
|
|
|
||
|
|
buf.append(",");
|
||
|
|
s = rs.getString(2);
|
||
|
|
buf.append(s);
|
||
|
|
|
||
|
|
buf.append(", $");
|
||
|
|
s = rs.getString(3);
|
||
|
|
buf.append(s);
|
||
|
|
|
||
|
|
listings.append(buf.toString(), null);
|
||
|
|
buf.setLength(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (i == 0)
|
||
|
|
{
|
||
|
|
listings.append("No bids found", null);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
// Currently no valid listings retrieved, so lets
|
||
|
|
// reset it to empty.
|
||
|
|
listings = new List("JdbcMe Bids", Choice.IMPLICIT);
|
||
|
|
listings.append(GETBIDS, null);
|
||
|
|
listings.addCommand(backCommand);
|
||
|
|
listings.setCommandListener(this);
|
||
|
|
|
||
|
|
// Return to main after showing the error.
|
||
|
|
showError(main, e);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
finally
|
||
|
|
{
|
||
|
|
if (rs != null)
|
||
|
|
{
|
||
|
|
try
|
||
|
|
{
|
||
|
|
rs.close();
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
rs = null;
|
||
|
|
}
|
||
|
|
System.gc();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Update the listings card with the
|
||
|
|
* current list of bids that we are interested in.
|
||
|
|
*/
|
||
|
|
public void submitBid()
|
||
|
|
{
|
||
|
|
java.sql.Connection conn = null;
|
||
|
|
Statement stmt = null;
|
||
|
|
try
|
||
|
|
{
|
||
|
|
conn = DriverManager.getConnection(urlText.getString() + ";" + jdbcmeText.getString());
|
||
|
|
|
||
|
|
stmt = conn.createStatement();
|
||
|
|
|
||
|
|
// Since we do not want the prepared statement to persist,
|
||
|
|
// a normal statement is really better in this environemnt.
|
||
|
|
StringBuffer buf = new StringBuffer(100);
|
||
|
|
buf.append("Update QJdbcMe.RealEstate Set CurrentBid = ");
|
||
|
|
buf.append(bidText.getString());
|
||
|
|
buf.append(" Where MLS = '");
|
||
|
|
buf.append(bidTargetKey);
|
||
|
|
buf.append("' and CurrentBid < ");
|
||
|
|
buf.append(bidText.getString());
|
||
|
|
String sql = buf.toString();
|
||
|
|
|
||
|
|
int updated = stmt.executeUpdate(sql);
|
||
|
|
if (updated == 1)
|
||
|
|
{
|
||
|
|
// BID Accepted.
|
||
|
|
String oldS = listings.getString(bidRow);
|
||
|
|
int commaIdx = bidTarget.indexOf(',');
|
||
|
|
String bidAddr = bidTarget.substring(0, commaIdx);
|
||
|
|
|
||
|
|
String newS = bidTargetKey + "," + bidAddr + ", $" + bidText.getString();
|
||
|
|
|
||
|
|
ResultSet rs = null;
|
||
|
|
try
|
||
|
|
{
|
||
|
|
// Creator and dbtype unused in MIDP
|
||
|
|
rs = new JdbcMeOfflineResultSet("JdbcMidpBidListings", 0, 0);
|
||
|
|
rs.absolute(bidRow+1);
|
||
|
|
rs.updateString(3, bidText.getString());
|
||
|
|
rs.close();
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
if (rs != null)
|
||
|
|
rs.close();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Also update our live list of that result set.
|
||
|
|
listings.set(bidRow, newS, null);
|
||
|
|
display.setCurrent(listings);
|
||
|
|
conn.commit();
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
conn.rollback();
|
||
|
|
throw new SQLException("Failed to bid, someone beat you to it");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
catch (SQLException e)
|
||
|
|
{
|
||
|
|
// Return to the bid form after showing the error.
|
||
|
|
showError(bidForm, e);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
finally
|
||
|
|
{
|
||
|
|
if (conn != null)
|
||
|
|
{
|
||
|
|
try
|
||
|
|
{
|
||
|
|
conn.close();
|
||
|
|
}
|
||
|
|
catch (Exception e)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
}
|
||
|
|
conn = null;
|
||
|
|
stmt = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Exit without exception, then show the current bids
|
||
|
|
showBids();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Show an error condition.
|
||
|
|
*/
|
||
|
|
public void showError(Displayable d, Exception e)
|
||
|
|
{
|
||
|
|
String s = e.toString();
|
||
|
|
|
||
|
|
onErrorGoBackTo = d;
|
||
|
|
errorForm = new Form("Error");
|
||
|
|
errorForm.setTitle("SQL Error");
|
||
|
|
errorForm.append(new StringItem("", s));
|
||
|
|
errorForm.addCommand(backCommand);
|
||
|
|
errorForm.setCommandListener(this);
|
||
|
|
display.setCurrent(errorForm);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Show the current bids.
|
||
|
|
*/
|
||
|
|
public void showBids()
|
||
|
|
{
|
||
|
|
if (listings == null)
|
||
|
|
{
|
||
|
|
// If we have no current listings, lets set
|
||
|
|
// them up.
|
||
|
|
listings = new List("JdbcMe Bids", Choice.IMPLICIT);
|
||
|
|
setupListingsFromOfflineData();
|
||
|
|
}
|
||
|
|
display.setCurrent(listings);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Time to pause, free any space we do not need right now.
|
||
|
|
*/
|
||
|
|
public void pauseApp()
|
||
|
|
{
|
||
|
|
display.setCurrent(null);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Destroy must cleanup everything.
|
||
|
|
*/
|
||
|
|
public void destroyApp(boolean unconditional)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
}</pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|