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 borrowInfoUpdate extends JFrame {  ResultSet rs;    //定義結(jié)果集  private DBManager db =new DBManager();//定義數(shù)據(jù)庫(kù)操作對(duì)象  XYLayout xYLayout1 = new XYLayout();  JButton jButtonupdate = new JButton();  JButton jButtonexit = new JButton();  JButton jButtondeciside = new JButton();  JButton jButtonClear = new JButton();  JLabel jLabel8 = new JLabel();  JLabel jLabel4 = new JLabel();  JTextField jTextbookname = new JTextField();  JTextField jTextborrowdate = new JTextField();  JLabel jLabel1 = new JLabel();  JLabel jLabel3 = new JLabel();  JLabel jLabel2 = new JLabel();  JTextField jTextcomment = new JTextField();  JTextField jTextstudentname = new JTextField();  public borrowInfoUpdate() {    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  public static void main(String[] args) {    borrowInfoUpdate borrowInfoUpdate = new borrowInfoUpdate();  }  private void jbInit() throws Exception {    jButtonClear.setFont(new java.awt.Font("Dialog", 0, 16));    jButtonClear.setText("清空");    jButtonClear.addMouseListener(new borrowInfoUpdate_jButtonClear_mouseAdapter(this));    jButtondeciside.setFont(new java.awt.Font("Dialog", 0, 16));     jButtondeciside.setText("確定");    jButtondeciside.addMouseListener(new borrowInfoUpdate_jButtondeciside_mouseAdapter(this));     jButtonexit.setFont(new java.awt.Font("Dialog", 0, 16));     jButtonexit.setText("退出");    jButtonupdate.setFont(new java.awt.Font("Dialog", 0, 16));      jButtonupdate.setText("更新");    this.getContentPane().setLayout(xYLayout1);    jLabel8.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel8.setText("輸入借閱者姓名或書名點(diǎn)擊確定，將調(diào)出此書相關(guān)信息");    jLabel4.setText("備注");    jLabel4.setFont(new java.awt.Font("Dialog", 0, 16));    jTextbookname.setText("");    jTextbookname.setFont(new java.awt.Font("Dialog", 0, 16));    jTextborrowdate.setText("");    jTextborrowdate.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel1.setText("借閱者姓名");    jLabel1.setRequestFocusEnabled(true);    jLabel1.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel3.setText("借閱日期");    jLabel3.setFont(new java.awt.Font("Dialog", 0, 16));    jLabel2.setText("書名");    jLabel2.setFont(new java.awt.Font("Dialog", 0, 16));    jTextcomment.setText("");    jTextcomment.setFont(new java.awt.Font("Dialog", 0, 16));    jTextstudentname.setText("");    jTextstudentname.setFont(new java.awt.Font("Dialog", 0, 16));    this.getContentPane().add(jButtondeciside, new XYConstraints(180, 338, -1, 28));    this.getContentPane().add(jButtonupdate, new XYConstraints(246, 338, 74, 27));    this.getContentPane().add(jButtonexit, new XYConstraints(320, 338, 75, 28));    this.getContentPane().add(jButtonClear, new XYConstraints(113, 338, 66, 28));    this.getContentPane().add(jTextstudentname,  new XYConstraints(219, 90, 150, 26));    this.getContentPane().add(jLabel4, new XYConstraints(90, 247, 63, 29));    this.getContentPane().add(jTextbookname, new XYConstraints(218, 144, 154, 23));    this.getContentPane().add(jTextborrowdate, new XYConstraints(218, 187, 153, -1));    this.getContentPane().add(jLabel1, new XYConstraints(91, 86, 88, 33));    this.getContentPane().add(jLabel3, new XYConstraints(88, 200, 87, 29));    this.getContentPane().add(jLabel2, new XYConstraints(88, 144, 89, 35));    this.getContentPane().add(jTextcomment, new XYConstraints(219, 236, 154, -1));    this.getContentPane().add(jLabel8,  new XYConstraints(17, 26, 435, 25));  }  void jButtondeciside_mouseClicked(MouseEvent e) {    String sql;    //定義變量，用來(lái)判斷是否是第一個(gè)查詢條件    boolean  isfirst =true;    sql="select * from BookBorrow ";      //如果款型的查詢條件不為空    if (jTextstudentname.getText().trim().length() ==0)       {}       else       {          sql=sql+"  where  studentname='"+jTextstudentname.getText().trim()+"'";          isfirst=false;       }            //如果顏色的查詢條件不為空      if (jTextbookname.getText().trim().length()==0)      {}      else      {    //如果是第一個(gè)查詢條件        if (isfirst)        sql=sql+" where bookname='"+jTextbookname.getText().trim() +"'";          //如果是第二個(gè)查詢條件        else         sql=sql+" and bookname='"+jTextbookname.getText().trim() +"'";      }    //執(zhí)行數(shù)據(jù)庫(kù)的查詢操作    rs =db.getResult(sql);     try {            //判斷返回的結(jié)果集是否為空，若不為空顯示第一條記錄       if(! rs.equals(null) )       {  rs.first();         jTextstudentname.setText(rs.getString("studentname"));        jTextbookname.setText(rs.getString("bookname"));        jTextborrowdate.setText(rs.getString("borrowdate"));        jTextcomment.setText(rs.getString("comment"));       }       else       {   JOptionPane.showMessageDialog(null,"無(wú)次紀(jì)錄!");              }     }//若出現(xiàn)異常，彈出警告對(duì)話框     catch (SQLException ex) {     }  }   //清空文本框  void jButtonClear_mouseClicked(MouseEvent e) {          jTextstudentname.setText("");          jTextbookname.setText("");          jTextborrowdate.setText("");          jTextcomment.setText("");  }}class borrowInfoUpdate_jButtondeciside_mouseAdapter extends java.awt.event.MouseAdapter {  borrowInfoUpdate adaptee;  borrowInfoUpdate_jButtondeciside_mouseAdapter(borrowInfoUpdate adaptee) {    this.adaptee = adaptee;  }  public void mouseClicked(MouseEvent e) {    adaptee.jButtondeciside_mouseClicked(e);  }}class borrowInfoUpdate_jButtonClear_mouseAdapter extends java.awt.event.MouseAdapter {  borrowInfoUpdate adaptee;  borrowInfoUpdate_jButtonClear_mouseAdapter(borrowInfoUpdate adaptee) {    this.adaptee = adaptee;  }  public void mouseClicked(MouseEvent e) {    adaptee.jButtonClear_mouseClicked(e);  }}