Java數據庫編程中查詢結果的表格式輸出（源代碼）

最近在網絡上看見關于此標題的文章頗多，但內容大多相同，沒有一個文章從頭到尾給出完整的源代碼，令許多初學Swing者感到困惑。本文正是為解決這一問題而專門為廣大初學者設計的，程序執行結果如下圖所示。

本程序采用MSAclearcase/" target="_blank" >ccess數據庫，Database名稱為DBAddressBook，Table名稱為TblAddressBook。表結構如下：

字段名
類型

編號
Text(50)

姓名
Text(50)

電話
Text(50)

地址
Text(50)

由于本人對該程序的注釋極為詳細，故不再作進一步的講解，該程序在Windows2000，jdk1.3下編譯并成功運行。 下載源代碼。

執行方法：
參照上表設計數據庫，并配置ODBC的DSN名稱為AddressBook。

javac DisplayQueryResults.java
DisplayQueryResults
//DisplayQueryResults.java
import java.sql.*;
import javax.swing.*;
import java.awt.*;

import java.awt.event.*;
import java.util.*;
public class DisplayQueryResults extends JFrame {

//數據庫變量定義
private Connection connection;
private Statement statement;
private ResultSet resultSet;
private ResultSetMetaData rsMetaData;

//GUI變量定義
private JTable table;
private JTextArea inputQuery;
private JButton submitQuery;
public DisplayQueryResults()
{

//Form的標題
super( "輸入SQL語句，按提交按鈕查看結果。" );
//url中指定ODBC中設置的DSN名稱
String url = "jdbc:odbc:AddressBook";
String username = "";
String password = "";
//加載驅動程序以連接數據庫

try {
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
connection = DriverManager.getConnection(
url, username, password );
}

//捕獲加載驅動程序異常
catch ( ClassNotFoundException cnfex ) {
System.err.println(
"裝載 JDBC/ODBC 驅動程序失敗。" );
cnfex.printStackTrace();
System.exit( 1 ); // terminate program
}

//捕獲連接數據庫異常
catch ( SQLException sqlex ) {
System.err.println( "無法連接數據庫" );
sqlex.printStackTrace();
System.exit( 1 ); // terminate program
}

//如果數據庫連接成功，則建立GUI
//SQL語句
String test="SELECT * FROM TblAddressBook";
inputQuery = new JTextArea( test, 4, 30 );
submitQuery = new JButton( "查詢" );
//Button事件
submitQuery.addActionListener(
new ActionListener() {

public void actionPerformed( ActionEvent e )
{
getTable();
}
}
);

JPanel topPanel = new JPanel();
topPanel.setLayout( new BorderLayout() );
//將"輸入查詢"編輯框布置到 "CENTER"
topPanel.add( new JScrollPane( inputQuery), BorderLayout.CENTER );

//將"提交查詢"按鈕布置到 "SOUTH"
topPanel.add( submitQuery, BorderLayout.SOUTH );
table = new JTable();
Container c = getContentPane();
c.setLayout( new BorderLayout() );

//將"topPanel"編輯框布置到 "NORTH"
c.add( topPanel, BorderLayout.NORTH );
//將"table"編輯框布置到 "CENTER"
c.add( table, BorderLayout.CENTER );
getTable();
setSize( 500, 300 );

//顯示Form
show();
}
private void getTable()
{
try {

//執行SQL語句
String query = inputQuery.getText();
statement = connection.createStatement();
resultSet = statement.executeQuery( query );

//在表格中顯示查詢結果
displayResultSet( resultSet );
}
catch ( SQLException sqlex ) {
sqlex.printStackTrace();
}
}

private void displayResultSet( ResultSet rs )
throws SQLException
{

//定位到達第一條記錄
boolean moreRecords = rs.next();
//如果沒有記錄，則提示一條消息
if ( ! moreRecords ) {
JOptionPane.showMessageDialog( this,

"結果集中無記錄" );
setTitle( "無記錄顯示" );
return;
}
Vector columnHeads = new Vector();
Vector rows = new Vector();
try {

//獲取字段的名稱
ResultSetMetaData rsmd = rs.getMetaData();
for ( int i = 1; i <= rsmd.getColumnCount(); ++i )
columnHeads.addElement( rsmd.getColumnName( i ) );

//獲取記錄集
do {
rows.addElement( getNextRow( rs, rsmd ) );
} while ( rs.next() );

//在表格中顯示查詢結果
table = new JTable( rows, columnHeads );
JScrollPane scroller = new JScrollPane( table );
Container c = getContentPane();
c.remove(1);
c.add( scroller, BorderLayout.CENTER );

//刷新Table
c.validate();
}
catch ( SQLException sqlex ) {
sqlex.printStackTrace();
}
}
private Vector getNextRow( ResultSet rs,
ResultSetMetaData rsmd )
throws SQLException

{
Vector currentRow = new Vector();
for ( int i = 1; i <= rsmd.getColumnCount(); ++i )
currentRow.addElement( rs.getString( i ) );

//返回一條記錄
return currentRow;
}
public void shutDown()
{
try {

//斷開數據庫連接
connection.close();
}
catch ( SQLException sqlex ) {
System.err.println( "Unable to disconnect" );
sqlex.printStackTrace();
}
}

public static void main( String args[] )
{
final DisplayQueryResults app =
new DisplayQueryResults();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{

app.shutDown();
System.exit( 0 );
}
}
);
}
}

原文轉自：http://www.anti-gravitydesign.com