userdelete.java

比较完整功能全面的图书管理系统；

package bookmanager;

import javax.swing.*;
import com.borland.jbcl.layout.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class userDelete
    extends JFrame {
  //定义结果集
  ResultSet rs;
  //定义数据库操作对象
  private DBManager db = new DBManager();

  XYLayout xYLayout1 = new XYLayout();
  JLabel jLabel2 = new JLabel();
  JButton jButtonCancel = new JButton();
  JLabel jLabel1 = new JLabel();
  JTextField jTextFieldusername = new JTextField();
  JButton jButtonOK = new JButton();
  JPasswordField jPasswordold = new JPasswordField();

  public userDelete() {
    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    userDelete userDelete = new userDelete();
  }

  private void jbInit() throws Exception {
    jPasswordold.setText("");
    jButtonOK.setFont(new java.awt.Font("Dialog", 0, 16));
    jButtonOK.setText("确定");
    jButtonOK.addMouseListener(new userDelete_jButtonOK_mouseAdapter(this));
    jTextFieldusername.setFont(new java.awt.Font("Dialog", 0, 16));
    jTextFieldusername.setText("");
    jLabel1.setFont(new java.awt.Font("Dialog", 0, 16));
    jLabel1.setText("用户名");
    jButtonCancel.setFont(new java.awt.Font("Dialog", 0, 16));
    jButtonCancel.setText("取消");
    jButtonCancel.addMouseListener(new userDelete_jButtonCancel_mouseAdapter(this));
    jLabel2.setFont(new java.awt.Font("Dialog", 0, 16));
    jLabel2.setText("密码");
    this.getContentPane().setLayout(xYLayout1);
    xYLayout1.setWidth(400);
    xYLayout1.setHeight(239);
    this.setTitle("删除用户");
    this.getContentPane().add(jButtonOK, new XYConstraints(90, 174, 91, 31));
    this.getContentPane().add(jButtonCancel, new XYConstraints(208, 175, 94, 30));
    this.getContentPane().add(jLabel1, new XYConstraints(65, 37, 99, 34));
    this.getContentPane().add(jLabel2, new XYConstraints(72, 90, 80, 34));
    this.getContentPane().add(jTextFieldusername,
                              new XYConstraints(201, 40, 111, 28));
    this.getContentPane().add(jPasswordold, new XYConstraints(203, 92, 111, 26));
  }

  void jButtonCancel_mouseClicked(MouseEvent e) {
    this.dispose();
  }

  void jButtonOK_mouseClicked(MouseEvent e) {
    String strSQL;
    //校验用户名是否为空
    if (jTextFieldusername.getText().trim().equals("")) {
      JOptionPane.showMessageDialog(null, "书名不许为空！");
      return;
    }
    //生成sql操作语句，查询要删除的用户名是否存在，若存在执行删除，若不存在提示并返回
    strSQL = "select * from user where Username='" +
        jTextFieldusername.getText().trim() + "' and Password='" +
        jPasswordold.getText().trim() + "'";
    rs = db.getResult(strSQL);
    boolean isexist = false;
    try {
      isexist = rs.first();
    }
    catch (SQLException ex1) {
    }
    //若用户名不存在，提示警告信息
    if (!isexist)

    {
      JOptionPane.showMessageDialog(null, "用户名不存在，或原密码不正确！");
    }
    else {
      strSQL = "delete from user where Username='" +
          jTextFieldusername.getText().trim() + "'";
      //由数据库操作对象执行数据库操作，并返回操作成功失败的提示信息
      if (db.executeSql(strSQL)) {
        JOptionPane.showMessageDialog(null, "成功删除！");
      }
      else {
        JOptionPane.showMessageDialog(null, " 删除失败，请重新操作！");
      }
    }
  }
}

class userDelete_jButtonCancel_mouseAdapter
    extends java.awt.event.MouseAdapter {
  userDelete adaptee;

  userDelete_jButtonCancel_mouseAdapter(userDelete adaptee) {
    this.adaptee = adaptee;
  }

  public void mouseClicked(MouseEvent e) {
    adaptee.jButtonCancel_mouseClicked(e);
  }
}

class userDelete_jButtonOK_mouseAdapter
    extends java.awt.event.MouseAdapter {
  userDelete adaptee;

  userDelete_jButtonOK_mouseAdapter(userDelete adaptee) {
    this.adaptee = adaptee;
  }

  public void mouseClicked(MouseEvent e) {
    adaptee.jButtonOK_mouseClicked(e);
  }
}