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 returnBook extends JFrame {    //定義結果集  ResultSet rs;     // 定義數據庫操作對象  private DBManager db =new DBManager();  XYLayout xYLayout1 = new XYLayout();  JLabel jLabel4 = new JLabel();  JTextField jTextbookname = new JTextField();  JButton jButtonCancel = new JButton();  JButton jButtonOk = new JButton();  JLabel jLabel1 = new JLabel();  JLabel jLabel3 = new JLabel();  JButton jButtonReset = new JButton();  JTextField jTextreturndate = new JTextField();  JLabel jLabel2 = new JLabel();  JTextField jTextcomment = new JTextField();  JTextField jTextstudentname = new JTextField();  public returnBook() {    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  public static void main(String[] args) {    returnBook returnBook = new returnBook();  }  private void jbInit() throws Exception {    jTextstudentname.setText("");    jTextstudentname.setFont(new java.awt.Font("Dialog", 0, 16));    jTextcomment.setText("");    jTextcomment.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel2.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel2.setText("書名");    jTextreturndate.setText("");    jTextreturndate.setFont(new java.awt.Font("Dialog", 0, 16));     jButtonReset.setText("清空");    jButtonReset.addMouseListener(new returnBook_jButtonReset_mouseAdapter(this));    jButtonReset.setFont(new java.awt.Font("Dialog", 0, 16));    jButtonReset.setEnabled(true);    jLabel3.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel3.setText("日期");    jLabel1.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel1.setRequestFocusEnabled(true);    jLabel1.setText("還書者姓名");    jButtonOk.setFont(new java.awt.Font("Dialog", 0, 16));     jButtonOk.setText("確定");    jButtonOk.addMouseListener(new returnBook_jButtonOk_mouseAdapter(this));    jButtonCancel.setFont(new java.awt.Font("Dialog", 0, 16));    jButtonCancel.addMouseListener(new returnBook_jButtonCancel_mouseAdapter(this));    jButtonCancel.setText("退出");    jButtonCancel.addMouseListener(new returnBook_jButtonCancel_mouseAdapter(this));    jTextbookname.setText("");    jTextbookname.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel4.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel4.setText("備注");    this.getContentPane().setLayout(xYLayout1);    xYLayout1.setWidth(497);    xYLayout1.setHeight(306);    this.getContentPane().add(jTextstudentname,  new XYConstraints(204, 32, 134, 26));    this.getContentPane().add(jLabel4, new XYConstraints(79, 184, 63, 29));    this.getContentPane().add(jTextbookname, new XYConstraints(200, 82, 154, 30));    this.getContentPane().add(jButtonCancel, new XYConstraints(334, 229, 100, 36));    this.getContentPane().add(jButtonOk, new XYConstraints(208, 230, 101, 36));    this.getContentPane().add(jLabel3, new XYConstraints(79, 136, 87, 29));    this.getContentPane().add(jButtonReset, new XYConstraints(57, 233, 104, 32));    this.getContentPane().add(jTextreturndate, new XYConstraints(202, 131, 137, -1));    this.getContentPane().add(jLabel2, new XYConstraints(82, 79, 89, 35));    this.getContentPane().add(jTextcomment, new XYConstraints(206, 187, 137, -1));    this.getContentPane().add(jLabel1, new XYConstraints(80, 29, 88, 33));  }  void jButtonCancel_mouseClicked(MouseEvent e) {             this.dispose();  }//清空所有文本框  void jButtonReset_mouseClicked(MouseEvent e) {       jTextstudentname.setText("");       jTextbookname.setText("");       jTextreturndate.setText("");       jTextcomment.setText("");  }  void jButtonOk_mouseClicked(MouseEvent e) {          String strSQL ;         //借閱者姓名是否為空            if(jTextstudentname.getText().trim().equals(""))            {JOptionPane.showMessageDialog(null,"借閱者姓名不許為空！");                return;}          //書名是否為空        if(jTextbookname.getText().trim().equals(""))            {JOptionPane.showMessageDialog(null,"書名不許為空！");                return;}          //還閱日起是否為空        if(jTextreturndate.getText().trim().equals(""))             {JOptionPane.showMessageDialog(null,"還閱日起不許為空！");                return;}          //檢驗是否此人借的此書          strSQL="select * from BookBorrow where studentname='"+jTextstudentname.getText().trim() +"'";          strSQL=strSQL+" and bookname='"+jTextbookname.getText().trim()+"'";          rs=db.getResult(strSQL) ;       boolean  isexist=false;                  try {                           isexist = rs.first();                           }                  catch (SQLException ex1) {                           }    //若用戶名不存在，提示警告信息提醒用戶從新輸入      if(!isexist)           {JOptionPane.showMessageDialog(null,"用戶名不存在，或原密碼不正確！");            return;           }        //生成更新sql語句                 strSQL="update  BookBorrow set returndate='"+jTextreturndate.getText()+"',";                 strSQL=strSQL+"  comment='"+jTextcomment.getText() +"'";                 strSQL=strSQL+" where studentname='"+jTextstudentname.getText() +"'";                 strSQL=strSQL+" and bookname='"+jTextbookname.getText() +"'";           //由數據庫操作對象執行數據庫操作，并返回操作成功失敗的提示信息                if(db.executeSql(strSQL) ){                      JOptionPane.showMessageDialog(null,"操作成功!");                    }                else                   {                     JOptionPane.showMessageDialog(null,"此借書者不存在！請確認！");                   }  }}class returnBook_jButtonCancel_mouseAdapter extends java.awt.event.MouseAdapter {  returnBook adaptee;  returnBook_jButtonCancel_mouseAdapter(returnBook adaptee) {    this.adaptee = adaptee;  }  public void mouseClicked(MouseEvent e) {    adaptee.jButtonCancel_mouseClicked(e);  }}class returnBook_jButtonReset_mouseAdapter extends java.awt.event.MouseAdapter {  returnBook adaptee;  returnBook_jButtonReset_mouseAdapter(returnBook adaptee) {    this.adaptee = adaptee;  }  public void mouseClicked(MouseEvent e) {    adaptee.jButtonReset_mouseClicked(e);  }}class returnBook_jButtonOk_mouseAdapter extends java.awt.event.MouseAdapter {  returnBook adaptee;  returnBook_jButtonOk_mouseAdapter(returnBook adaptee) {    this.adaptee = adaptee;  }  public void mouseClicked(MouseEvent e) {    adaptee.jButtonOk_mouseClicked(e);  }}