| 最近在网络上看见关于此标题的文章颇多，但内容大多相同，没有一个文章从头到尾给出完整的源代码，令许多初学Swing者感到困惑。本文正是为解决这一问题而专门为广大初学者设计的，程序执行结果如下图所示。  本程序采用MSAccess数据库，Database名称为DBAddressBook，Table名称为TblAddressBook。表结构如下：
字段名
类型
编号
Text(50)
姓名
Text(50)
电话
Text(50)
地址
Text(50)
由于本人对该程序的注释极为详细，故不再作进一步的讲解，该程序在Windows2000，jdk1.3下编译并成功运行。 下载源代码。
执行方法：
参照上表设计数据库，并配置ODBC的DSN名称为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 {
//数据库变量定义
private Connection connection;
private Statement statement;
private ResultSet resultSet;
private ResultSetMetaData rsMetaData;
//GUI变量定义
private JTable table;
private JTextArea inputQuery;
private JButton submitQuery;
public DisplayQueryResults()
{
//Form的标题
super( "输入SQL语句，按提交按钮查看结果。" );
//url中指定ODBC中设置的DSN名称
String url = "jdbc:odbc:AddressBook";
String username = "";
String password = "";
//加载驱动程序以连接数据库
try {
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
connection = DriverManager.getConnection(
url, username, password );
}
//捕获加载驱动程序异常
catch ( ClassNotFoundException cnfex ) {
System.err.println(
"装载 JDBC/ODBC 驱动程序失败。" );
cnfex.printStackTrace();
System.exit( 1 ); // terminate program
}
//捕获连接数据库异常
catch ( SQLException sqlex ) {
System.err.println( "无法连接数据库" );
sqlex.printStackTrace();
System.exit( 1 ); // terminate program
}
//如果数据库连接成功，则建立GUI
//SQL语句
String test="SELECT * FROM TblAddressBook";
inputQuery = new JTextArea( test, 4, 30 );
submitQuery = new JButton( "查询" );
//Button事件
submitQuery.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent e )
{
getTable();
}
}
);
JPanel topPanel = new JPanel();
topPanel.setLayout( new BorderLayout() );
//将"输入查询"编辑框布置到 "CENTER"
topPanel.add( new JScrollPane( inputQuery), BorderLayout.CENTER );
//将"提交查询"按钮布置到 "SOUTH"
topPanel.add( submitQuery, BorderLayout.SOUTH );
table = new JTable();
Container c = getContentPane();
c.setLayout( new BorderLayout() );
//将"topPanel"编辑框布置到 "NORTH"
c.add( topPanel, BorderLayout.NORTH );
//将"table"编辑框布置到 "CENTER"
c.add( table, BorderLayout.CENTER );
getTable();
setSize( 500, 300 );
//显示Form
show();
}
private void getTable()
{
try {
//执行SQL语句
String query = inputQuery.getText();
statement = connection.createStatement();
resultSet = statement.executeQuery( query );
//在表格中显示查询结果
displayResultSet( resultSet );
}
catch ( SQLException sqlex ) {
sqlex.printStackTrace();
}
}
private void displayResultSet( ResultSet rs )
throws SQLException
{
//定位到达第一条记录
boolean moreRecords = rs.next();
//如果没有记录，则提示一条消息
if ( ! moreRecords ) {
JOptionPane.showMessageDialog( this,
"结果集中无记录" );
setTitle( "无记录显示" );
return;
}
Vector columnHeads = new Vector();
Vector rows = new Vector();
try {
//获取字段的名称
ResultSetMetaData rsmd = rs.getMetaData();
for ( int i = 1; i <= rsmd.getColumnCount(); ++i )
columnHeads.addElement( rsmd.getColumnName( i ) );
//获取记录集
do {
rows.addElement( getNextRow( rs, rsmd ) );
} while ( rs.next() );
//在表格中显示查询结果
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 ) );
//返回一条记录
return currentRow;
}
public void shutDown()
{
try {
//断开数据库连接
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 );
}
}
);
}
}
|
当前位置：
