一个简单的访问数据库的应用程序

file 1  :
先把主程序的父类搬来！
/*
 * date:   2004-11-20
 * author：zhangyu6050;
 * todo:
 * bugs:
 */
package sd;
 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public abstract class MyQQPan extends JFrame  implements ActionListener
{
 JTextArea textreceive=new JTextArea();
 JTextArea textsend =new JTextArea("select * from Employees");
 JButton button =new JButton ("Send");
 public MyQQPan()
 {
  //init controls
  setTitle("查询框架");
  setBounds(50,50,500,400);
  getContentPane().setLayout(null);

  getContentPane().add(textreceive);
  getContentPane().add(textsend);
  getContentPane().add(button);
 
  button.addActionListener(this);
 
  textreceive.setBounds(0,0,450,300);
  textsend.setBounds(10,320,350,60);
  button.setBounds(370,320,70,30);
 }
 
 
 
 public abstract void actionPerformed(ActionEvent event);
 
 
}
file 2  :
下面是主程序！
/*
 * date:   2004-11-19
 * author：zhangyu6050;
 * todo:
 * bugs:
 */
package sd;
//TextAreaDemo.java
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;

import javax.swing.*;
import sd.MySQL;
 
public class Myframe extends MyQQPan{
    PRivate String sql;
    private String rsult;
    // private int row;//要所取的列
    public void actionPerformed(ActionEvent e){
        if(e.getSource() instanceof JButton){
            sql=textsend.getText();           
           // row= Character.getNumericValue(sql.charAt(sql.length()-1));//得到要取的列数！
           // initRsult();
            Methods.ting(sql);//这个类集成了一些常用的方法！
            rsult=Methods.rStr;
            textreceive.setText(rsult);
        }
    } 
   
    public static void main(String[] args) {
        Myframe mf=new Myframe();  
        mf.setVisible(true); 
    }