bookdelete.java

比较完整功能全面的图书管理系统；

package bookmanager;

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

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

public class bookDelete
    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 jLabel1 = new JLabel();
  JTextField jTextFieldname = new JTextField();
  JButton jButtonOk = new JButton();
  JButton jButtonCancel = new JButton();
  public bookDelete() {
    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

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

  private void jbInit() throws Exception {
    jLabel1.setFont(new java.awt.Font("Dialog", 0, 16));
    jLabel1.setText("请输入您要删除的书的名称：");
    this.getContentPane().setLayout(xYLayout1);
    jButtonOk.setFont(new java.awt.Font("Dialog", 0, 16));
    jButtonOk.setText("确定");
    jButtonOk.addMouseListener(new bookDelete_jButtonOk_mouseAdapter(this));
    jButtonCancel.setFont(new java.awt.Font("Dialog", 0, 16));
    jButtonCancel.setText("退出");
    jButtonCancel.addMouseListener(new bookDelete_jButtonCancel_mouseAdapter(this));
    xYLayout1.setWidth(363);
    xYLayout1.setHeight(219);
    jTextFieldname.setFont(new java.awt.Font("Dialog", 0, 16));
    jTextFieldname.setText("");
    this.setTitle("删除书籍信息");
    this.getContentPane().add(jLabel1, new XYConstraints(28, 19, 226, 32));
    this.getContentPane().add(jTextFieldname, new XYConstraints(99, 85, 161, 27));
    this.getContentPane().add(jButtonOk, new XYConstraints(73, 159, 76, 28));
    this.getContentPane().add(jButtonCancel, new XYConstraints(195, 156, 81, 28));
  }

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

  void jButtonOk_mouseClicked(MouseEvent e) {
    String strSQL;
    //校验书名是否为空
    if (jTextFieldname.getText().trim().equals("")) {
      JOptionPane.showMessageDialog(null, "书名不许为空！");
      return;
    }
    //生成sql操作语句，查询要删除的书是否存在，若存在执行删除，若不存在提示并返回
    strSQL = "select * from Books where Bookname='" +
        jTextFieldname.getText().trim() + "'";
    rs = db.getResult(strSQL);
    boolean isexist = false;
    try {
      isexist = rs.first();
    }
    catch (SQLException ex1) {
    }
    //若此书不存在，提示警告信息
    if (!isexist)
    {
      JOptionPane.showMessageDialog(null, "此书不存在！");
    }
    else {
      //生成删除此书的sql语句
      strSQL = "delete from Books where Bookname='" +
          jTextFieldname.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 bookDelete_jButtonCancel_mouseAdapter
    extends java.awt.event.MouseAdapter {
  bookDelete adaptee;

  bookDelete_jButtonCancel_mouseAdapter(bookDelete adaptee) {
    this.adaptee = adaptee;
  }

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

class bookDelete_jButtonOk_mouseAdapter
    extends java.awt.event.MouseAdapter {
  bookDelete adaptee;

  bookDelete_jButtonOk_mouseAdapter(bookDelete adaptee) {
    this.adaptee = adaptee;
  }

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