studentsdelete.java

学生信息管理系统,包括成绩查询,成绩排序,用ACCESS做数据库连接

package Chapter1;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.awt.Rectangle;
import java.awt.Font;

public class StudentsDelete extends JFrame implements ActionListener
{
   public static final int WIDTH=400;
   public static final int HEIGHT=400;
  JLabel jLabel1 = new JLabel();
  JTextField jTextField1 = new JTextField();
  JLabel jLabel2 = new JLabel();
  JTextField jTextField2 = new JTextField();
  JButton jButton1 = new JButton();
  JButton jButton2 = new JButton();
  JButton jButton3 = new JButton();
   public StudentsDelete()
   {
     setSize(WIDTH,HEIGHT);
     setTitle("删除学生");
     Container contentPane=getContentPane();
     contentPane.setBackground(Color.green);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
   }
   public void actionPerformed(ActionEvent e)
   {
     if(e.getActionCommand().equals("删除"))
        { //用于获取用户输入的信息
           try
           { String url="jdbc:odbc:MySecondAccess";
             Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
             Connection con=DriverManager.getConnection(url,"","");
             Statement stmt=con.createStatement();
             String  SQLOrder="DELETE FROM StudentsInformation WHERE 帐号='"+jTextField1.getText()+"'";
             stmt.executeUpdate(SQLOrder);
             stmt.close();
             con.close();
             //改进之处:判断学号是否存在,若不存在还删什麼劲呢?
             JOptionPane.showMessageDialog(null,"删除成功！","提示信息",JOptionPane.INFORMATION_MESSAGE);
           }
           catch(Exception ex)
           {
             System.out.println(ex.getStackTrace());
             System.out.println(ex.getMessage());
           }
           jTextField1.setText("");
        }
      else if (e.getActionCommand().equals("重置"))
      {
             jTextField1.setText("");
      }
      else if  (e.getActionCommand().equals("返回"))
      {
        this.dispose();
        ManagerInterface n=new ManagerInterface();
        n.setVisible(true);
      }
   }
   public static void main(String[] args)
   {
       StudentsDelete n=new StudentsDelete();
       n.setVisible(true);
   }
  private void jbInit() throws Exception {
    jLabel1.setFont(new java.awt.Font("Dialog", 1, 13));
    jLabel1.setText("请输入您要删除的学生的学号:");
    jLabel1.setBounds(new Rectangle(27, 101, 191, 27));
    this.getContentPane().setLayout(null);
    jTextField1.setText("");
    jTextField1.setBounds(new Rectangle(234, 102, 95, 21));
    jButton1.setBounds(new Rectangle(72, 195, 66, 30));
    jButton1.setFont(new java.awt.Font("Dialog", 1, 13));
    jButton1.setText("删除");
    jButton2.setBounds(new Rectangle(173, 194, 66, 31));
    jButton2.setFont(new java.awt.Font("Dialog", 1, 13));
    jButton2.setText("重置");
    jButton3.setBounds(new Rectangle(275, 194, 67, 31));
    jButton3.setFont(new java.awt.Font("Dialog", 1, 13));
    jButton3.setText("返回");
    this.getContentPane().add(jLabel2, null);
    this.getContentPane().add(jTextField2, null);
    this.getContentPane().add(jButton1, null);
    this.getContentPane().add(jButton3, null);
    this.getContentPane().add(jButton2, null);
    this.getContentPane().add(jTextField1, null);
    this.getContentPane().add(jLabel1, null);
    jButton1.addActionListener(this);
    jButton2.addActionListener(this);
    jButton3.addActionListener(this);
  }

}