利用JDBC开发图书管理系统
2009-07-01 15:39
561 查看
1、删除功能
void B7_mouseClicked(MouseEvent e) ——“删除”按钮
2、新增功能
void B5_mouseClicked(MouseEvent e)——“新增”按钮
void T1_actionPerformed(ActionEvent e)
void B9_mouseClicked(MouseEvent e)——“确定”按钮
void ToInsert()
void B10_mouseClicked(MouseEvent e)——“离开”按钮
3、修改功能
void B6_mouseClicked(MouseEvent e)——“修改”按钮
void B9_mouseClicked(MouseEvent e)——“确定”按钮
void ToUpdate()
void B10_mouseClicked(MouseEvent e)——“离开”按钮
4、查询功能
void B8_mouseClicked(MouseEvent e)——“查询”按钮
void B9_mouseClicked(MouseEvent e)——“确定”按钮
void ToSelect()
void B10_mouseClicked(MouseEvent e)——“离开”按钮
5、控制画面操作过程
void paintView()
T2、T3、T4组件的addActionListener()
自定义类class myActionListener
Code
/*
* 本例的新增、修改、查询都要配合同一个确定和离开按钮、故本例定义了一个workingMode变量
* 来分辨当时的状态。而且单击离开按钮时，要回到之前所浏览的那一条数据，所以还定义了一个
* CurrentRow变量
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class MyBook extends JFrame{
Connection ConnObj;
Statement SQLStatement;
ResultSet RS;
int CurrentRow=1;
static final int BROWSE=0;
static final int PREINSERT=1;
static final int TOINSERT=2;
static final int TOUPDATE=3;
static final int TOSELECT=4;
static final int SELECTED=5;
int workingMode=MyBook.BROWSE;
//========================================
MyBook frame;
JPanel contentPane;
Panel panel1;
Label L1,L2,L3,L4,L5;
TextField T1,T2,T3,T4;
Button B1,B2,B3,B4,B5,B6,B7,B8,B9,B10;
public MyBook() {
frame=this;
contentPane=(JPanel)this.getContentPane();
contentPane.setLayout(null);
//=============================================
panel1=new Panel();
panel1.setBounds(0, 0, 380, 160);
panel1.setLayout(null);
contentPane.add(panel1,null);
L1=new Label("状态： 浏览模式");
L1.setBounds(20, 10, 350, 25);
panel1.add(L1, null);
L2=new Label("ISBN:");
L2.setBounds(20, 40, 50, 25);
panel1.add(L2,null);
T1=new TextField();
T1.setBounds(70, 40, 300, 25);
T1.addActionListener(new ActionListener()
{//按【Enter】键
public void actionPerformed(ActionEvent e)
{//在T1按【Enter】键会触发此事件
T1_actionPerformed(e);
}
});
panel1.add(T1,null);
L3=new Label("书名：");
L3.setBounds(20, 70, 50, 25);
panel1.add(L3,null);
L4=new Label("作者：");
L4.setBounds(20, 100, 50, 25);
panel1.add(L4,null);
L5=new Label("价格：");
L5.setBounds(20, 130, 50, 25);
panel1.add(L5,null);
T2=new TextField();
T2.setBounds(70, 70, 300, 25);
T2.addActionListener(new MyActionListener());//按【Enter】键
panel1.add(T2,null);
T3=new TextField();
T3.setBounds(70, 100, 300, 25);
T3.addActionListener(new MyActionListener());//按【Enter】键
panel1.add(T3,null);
T4=new TextField();
T4.setBounds(70, 130, 300, 25);
T4.addActionListener(new MyActionListener());//按【Enter】键
panel1.add(T4,null);
//==========================================
B1=new Button("第一条");
B1.setBounds(new Rectangle(30, 180, 65, 20));
B1.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B1_mouseClicked(e);//程序代码较多，写在另一个方法中
}
});
contentPane.add(B1);
B2=new Button("上一条");
B2.setBounds(100, 180, 65, 20);
B2.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B2_mouseClicked(e);
}
});
contentPane.add(B2);
B3=new Button("下一条");
B3.setBounds(170, 180, 65, 20);
B3.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B3_mouseClicked(e);
}
});
contentPane.add(B3);
B4=new Button("最末条");
B4.setBounds(240, 180, 65, 20);
B4.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B4_mouseClicked(e);
}
});
contentPane.add(B4);
B5=new Button("新增");
B5.setBounds(30, 210, 65, 20);
B5.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B5_mouseClicked(e);
}
});
contentPane.add(B5);
B6=new Button("修改");
B6.setBounds(100, 210, 65, 20);
B6.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B6_mouseClicked(e);
}
});
contentPane.add(B6);
B7=new Button("删除");
B7.setBounds(170, 210, 65, 20);
B7.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B7_mouseClicked(e);
}
});
contentPane.add(B7);
B8=new Button("查询");
B8.setBounds(240, 210, 65, 20);
B8.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B8_mouseClicked(e);
}
});
contentPane.add(B8);
B9=new Button("确定");
B9.setBounds(310, 180, 65, 20);
B9.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B9_mouseClicked(e);
}
});
contentPane.add(B9);
B10=new Button("离开");
B10.setBounds(310, 210, 65, 20);
B10.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B10_mouseClicked(e);
}
});
contentPane.add(B10);
//==============================================
//控制画面操作过程
panel1.setEnabled(false); //其内的 TextField 将无法编辑文字
B9.setEnabled(false);
B10.setEnabled(false);
//==============================================
this.setBounds(200, 100, 415, 280);
this.setTitle("图书管理系统");
//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addWindowListener(new WindowAdapter()
{
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.setVisible(true);
//=========================================================
//加载JDBC Driver、连接数据库、送SELECT语句、返回结果集
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//载入JDBC Driver
ConnObj=DriverManager.getConnection("jdbc:odbc:myBook");
//连接ODBC设置的myBook数据源，jdbc:subprotocol:Alias
SQLStatement=ConnObj.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
//其后由此Statement对象执行SQL指令时，返回的会是可卷动且只读的ResultSet对象
RS=SQLStatement.executeQuery("select * from BookData");
//执行SELECT语句，会返回一个结果集
//查询myBook数据源的BookData数据表全部字段的记录
//必须先向下移到第一条：next(),因为一开始是指到第一条之前
//第一次调用 next 方法使第一行成为当前行
if(RS.next())
{
//RS内至少有一条记录，才会返回true
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
JOptionPane.showMessageDialog(this, "myBook数据库内，无任何数据");
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(frame, ex.getMessage());
}
}
class MyActionListener implements ActionListener
{ //T2、T3、T4都加入此ActionListener
public void actionPerformed(ActionEvent e)
{
((TextField)e.getSource()).transferFocus();//按【Enter】键,focus往下一个组件
}
}
void B1_mouseClicked(MouseEvent e)
{
try
{
RS.first();
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex){}
}
void B2_mouseClicked(MouseEvent e)
{
try
{
if(RS.previous())
{
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
RS.first();
JOptionPane.showMessageDialog(B2,"已到第一条");
}
}
catch(SQLException ex){}
}
void B3_mouseClicked(MouseEvent e)
{
try
{
if(RS.next())
{
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
RS.last();
JOptionPane.showMessageDialog(B3, "已到最末条");
}
}
catch(SQLException ex){}
}
void B4_mouseClicked(MouseEvent e)
{
try
{
RS.last();
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex){}
}
void B5_mouseClicked(MouseEvent e)
{ //新增一条数据
try
{
CurrentRow=RS.getRow(); //进行新增之前指到的这一条
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B5, ex.getMessage());
}
workingMode=MyBook.PREINSERT;
paintView();
T1.setText(""); //清空所有 TextField
T2.setText("");
T3.setText("");
T4.setText("");
T1.requestFocus(); //光标进入到 T1
}
void B6_mouseClicked(MouseEvent e)
{
workingMode=MyBook.TOUPDATE;
paintView();
try
{
CurrentRow=RS.getRow(); //现在更新这条的位置
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B6, ex.getMessage());
}
T2.requestFocus();
}
void B7_mouseClicked(MouseEvent e)
{ //删除一条数据
try
{
//记删除一条后要指到的位置
if(RS.isLast()&&(!RS.isFirst()))
{
//若删除是：最末条且非第一条
CurrentRow=RS.getRow()-1; //删除后要移到它的前一条
}
else
CurrentRow=RS.getRow(); //包括：不是最末条、是最末条又正是第一条
int choice=JOptionPane.showConfirmDialog(frame, "确定要删除现在这一条吗？");
if(choice==JOptionPane.YES_OPTION) //若用户单击“是(Y)”按钮
{
String deleteSQL="delete from BookData where ISBN='"+T1.getText().trim()+"'";
//System.out.println(deleteSQL); //可用于测试时
SQLStatement.executeUpdate(deleteSQL); //对数据库进行删除操作
RS=SQLStatement.executeQuery("select * from BookData");
if(RS.absolute(CurrentRow))
{ //移到刚才指的位置，若是删除最末条，会移到它的前一条
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
T1.setText("");
T2.setText("");
T3.setText("");
T4.setText("");
}
}
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(B7, ex.getMessage());
}
}
void B8_mouseClicked(MouseEvent e)
{ //查询数据
workingMode=MyBook.TOSELECT;
paintView();
try
{
CurrentRow=RS.getRow(); //目前指到的这一条
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B8, ex.getMessage());
}
}
void B9_mouseClicked(MouseEvent e)
{ //确定操作，用于新增、修改、查询
switch(workingMode)
{
case MyBook.TOINSERT:
ToInsert(); //确定要进行新增的操作
break;
case MyBook.TOUPDATE:
ToUpdate(); //确定要进行修改的操作
break;
case MyBook.TOSELECT:
ToSelect(); //确定要进行查询的操作
break;
default:
JOptionPane.showMessageDialog(B9, "目的不明！");
}
paintView(); //控制画面
}
//============================================================
/*用户单击“离开”按钮的情况:
* 1.进入新增模式，但不要新增
* 2.进入修改模式，但不要修改
* 3.进入查询模式，但不要查询，或是已经查询过了
*/
void B10_mouseClicked(MouseEvent e)
{ //离开新增、修改、查询模式
try
{
RS=SQLStatement.executeQuery("select * from BookData");
if(RS.absolute(CurrentRow))
{
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B10, ex.getMessage());
}
//无论对数据库的新增、修改、查询操作是否成功
workingMode=MyBook.BROWSE;
CurrentRow=1;
paintView(); //控制画面
}
void T1_actionPerformed(ActionEvent e)
{ //在T1内按【Enter】键会调用此方法
if(workingMode!=MyBook.PREINSERT)
{ //TOINSERT、TOUPDATE、TOSELECT 状态才有可能
T1.transferFocus(); //Focus移到下一个组件
return;
}
else
{ //PREINSERT 状态
if(T1.getText().trim().equals(""))
{
T1.requestFocus(); //令T1取得Focus
return;
}
}
String newISBN=T1.getText().trim();
if(newISBN.length()>13)
{ //数据不要超过数据表设置的字段长度
JOptionPane.showMessageDialog(T1, "ISBN 字段最大长度为 13！");
return;
}
//新增时先检查该条是否已存在
try
{
RS=SQLStatement.executeQuery("select * from BookData where ISBN='"+newISBN+"'");
if(RS.next())
{ //显示已存在的该条数据
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
JOptionPane.showMessageDialog(T1, "此条记录已存在");
}
else
{
workingMode=MyBook.TOINSERT; //不得再更改新的一条ISBN
T1.setText(newISBN);
}
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(T1, ex.getMessage());
}
paintView(); //控制画面
T1.transferFocus(); //Focus移到下个组件
}
void ToInsert()
{ //实际进行新增
int checkPrice; //用来检查价格
int insertCount=0;
boolean ifInserted=false; //记录是否成功新增
if(T2.getText().trim().equals("")
||T3.getText().trim().equals("")
||T4.getText().trim().equals("")
||T2.getText().trim().length()>50
||T3.getText().trim().length()>30)
{
JOptionPane.showMessageDialog(B9, "有数据尚未填写正确的值！");
return;
}
try
{
checkPrice=Integer.parseInt(T4.getText().trim());
}
catch(NumberFormatException ex)
{
JOptionPane.showMessageDialog(B9, "价格请填入整数，最大为2147483647");
return;
}
//========================================================================
String insertSQL="insert into BookData(ISBN,BookName,Author,Price)"
+"values('"+T1.getText().trim()
+"','"+T2.getText().trim()
+"','"+T3.getText().trim()
+"',"+T4.getText().trim()+")";
try
{
//System.out.println(insertSQL); //可用于测试时
insertCount=SQLStatement.executeUpdate(insertSQL);
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
try
{
RS=SQLStatement.executeQuery("select * from BookData");
if(insertCount!=0)
{
System.out.println("Insert OK"); //可用于测试时
RS.last(); //若新增成功，就移到最末条
}
else
RS.absolute(CurrentRow);//若失败则移到刚才浏览时指的那条
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
//无论对数据库的新增操作是否成功
workingMode=MyBook.BROWSE;
CurrentRow=1;
}
void ToUpdate()
{ //实际进行修改
int checkPrice; //用来检查价格
if(T2.getText().trim().equals("")
||T3.getText().trim().equals("")
||T4.getText().trim().equals("")
||T2.getText().trim().length()>50
||T3.getText().trim().length()>30)
{
JOptionPane.showMessageDialog(null, "有数据尚未填写正确的值！");
return;
}
try
{
checkPrice=Integer.parseInt(T4.getText().trim());
}
catch(NumberFormatException ex)
{ //所填的文字，字面意义若非int整数，转型会失败
JOptionPane.showMessageDialog(null, "价格请填入整数，最大为2147483647");
return;
}
//==================================================
String updateSQL="update BookData set BookName='"+T2.getText().trim()
+"',Author='"+T3.getText().trim()
+"',Price="+T4.getText().trim()
+" where ISBN='"+T1.getText().trim()+"'";
System.out.println(updateSQL);
try
{
SQLStatement.executeUpdate(updateSQL);
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
try
{
RS=SQLStatement.executeQuery("select * from BookData");
RS.absolute(CurrentRow); //移到修改的那条
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
//无论对数据库的修改操作是否成功
workingMode=MyBook.BROWSE;
CurrentRow=1;
}
void ToSelect()
{ //实际进行查询
String condi="";
if(T1.getText().trim().equals("")
&&T2.getText().trim().equals("")
&&T3.getText().trim().equals("")
&&T4.getText().trim().equals(""))
{
JOptionPane.showMessageDialog(B8, "至少要填一个字段当条件");
return;
}
//=============================================================
if(!T1.getText().trim().equals("")) //若用户有填ISBN当条件
condi=" ISBN='" + T1.getText().trim() + "'";
if(!T2.getText().trim().equals("")) //若用户有填BookName当条件
if(condi.equals(""))
condi=" BookName='" + T2.getText().trim() + "'";
else
condi=condi + " AND BookName='" + T2.getText().trim() + "'";
if(!T3.getText().trim().equals("")) //若用户有填Author当条件
if(condi.equals(""))
condi=" Author='" + T3.getText().trim() + "'";
else
condi=condi + " AND Author='" + T3.getText().trim() + "'";
if(!T4.getText().trim().equals("")) //若用户有填Price当条件
if(condi.equals(""))
condi=" Price=" + T4.getText().trim();
else
condi=condi + " AND Price=" + T4.getText().trim();
String selectSQL="select * from BookData where" + condi;
System.out.println(selectSQL); //可用于测试时
try
{
RS=SQLStatement.executeQuery(selectSQL);
if(RS.next())
{ //有查到一条以上符合的记录
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{ //没查到符合的记录
T1.setText("");
T2.setText("");
T3.setText("");
T4.setText("");
}
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
workingMode=MyBook.SELECTED; //已查询
//查完还要回到之前记录的CurrentRow
}
void paintView()
{ //控制画面，即控制用户的操作过程
switch(workingMode)
{
case MyBook.BROWSE:
L1.setText("状态： 浏览模式");
break;
case MyBook.PREINSERT:
L1.setText("状态： 新增模式 - 输入ISBN后按键盘【Enter】键");
break;
case MyBook.TOINSERT:
L1.setText("状态： 新增模式");
break;
case MyBook.TOUPDATE:
L1.setText("状态：修改模式");
break;
case MyBook.TOSELECT:
L1.setText("状态： 查询模式");
break;
case MyBook.SELECTED:
L1.setText("状态： 查询结果");
break;
}
//============================================================
if(workingMode==MyBook.TOINSERT||workingMode==MyBook.TOUPDATE)
T1.setEditable(false);
else
T1.setEditable(true);
//============================================================
if(workingMode==MyBook.PREINSERT)
{
T2.setEnabled(false);
T3.setEnabled(false);
T4.setEnabled(false);
}
else
{
T2.setEnabled(true);
T3.setEnabled(true);
T4.setEnabled(true);
}
//=============================================================
if(workingMode==MyBook.BROWSE||workingMode==MyBook.SELECTED)
{
panel1.setEnabled(false); //此时光标不可进入其内的T1-T4
B1.setEnabled(true);
B2.setEnabled(true);
B3.setEnabled(true);
B4.setEnabled(true);
}
else
{
panel1.setEnabled(true);
B1.setEnabled(false);
B2.setEnabled(false);
B3.setEnabled(false);
B4.setEnabled(false);
}
//=============================================================
if(workingMode==MyBook.BROWSE)
{
B5.setEnabled(true);
B6.setEnabled(true);
B7.setEnabled(true);
B8.setEnabled(true);
}
else
{
B5.setEnabled(false);
B6.setEnabled(false);
B7.setEnabled(false);
B8.setEnabled(false);
}
//==============================================================
if(workingMode==MyBook.TOINSERT||workingMode==MyBook.TOUPDATE||workingMode==MyBook.TOSELECT)
B9.setEnabled(true);
else
B9.setEnabled(false);
//==============================================================
if(workingMode!=MyBook.BROWSE)
B10.setEnabled(true);
else
B10.setEnabled(false);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
new MyBook();
}
}
void B7_mouseClicked(MouseEvent e) ——“删除”按钮
2、新增功能
void B5_mouseClicked(MouseEvent e)——“新增”按钮
void T1_actionPerformed(ActionEvent e)
void B9_mouseClicked(MouseEvent e)——“确定”按钮
void ToInsert()
void B10_mouseClicked(MouseEvent e)——“离开”按钮
3、修改功能
void B6_mouseClicked(MouseEvent e)——“修改”按钮
void B9_mouseClicked(MouseEvent e)——“确定”按钮
void ToUpdate()
void B10_mouseClicked(MouseEvent e)——“离开”按钮
4、查询功能
void B8_mouseClicked(MouseEvent e)——“查询”按钮
void B9_mouseClicked(MouseEvent e)——“确定”按钮
void ToSelect()
void B10_mouseClicked(MouseEvent e)——“离开”按钮
5、控制画面操作过程
void paintView()
T2、T3、T4组件的addActionListener()
自定义类class myActionListener
Code
/*
* 本例的新增、修改、查询都要配合同一个确定和离开按钮、故本例定义了一个workingMode变量
* 来分辨当时的状态。而且单击离开按钮时，要回到之前所浏览的那一条数据，所以还定义了一个
* CurrentRow变量
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class MyBook extends JFrame{
Connection ConnObj;
Statement SQLStatement;
ResultSet RS;
int CurrentRow=1;
static final int BROWSE=0;
static final int PREINSERT=1;
static final int TOINSERT=2;
static final int TOUPDATE=3;
static final int TOSELECT=4;
static final int SELECTED=5;
int workingMode=MyBook.BROWSE;
//========================================
MyBook frame;
JPanel contentPane;
Panel panel1;
Label L1,L2,L3,L4,L5;
TextField T1,T2,T3,T4;
Button B1,B2,B3,B4,B5,B6,B7,B8,B9,B10;
public MyBook() {
frame=this;
contentPane=(JPanel)this.getContentPane();
contentPane.setLayout(null);
//=============================================
panel1=new Panel();
panel1.setBounds(0, 0, 380, 160);
panel1.setLayout(null);
contentPane.add(panel1,null);
L1=new Label("状态： 浏览模式");
L1.setBounds(20, 10, 350, 25);
panel1.add(L1, null);
L2=new Label("ISBN:");
L2.setBounds(20, 40, 50, 25);
panel1.add(L2,null);
T1=new TextField();
T1.setBounds(70, 40, 300, 25);
T1.addActionListener(new ActionListener()
{//按【Enter】键
public void actionPerformed(ActionEvent e)
{//在T1按【Enter】键会触发此事件
T1_actionPerformed(e);
}
});
panel1.add(T1,null);
L3=new Label("书名：");
L3.setBounds(20, 70, 50, 25);
panel1.add(L3,null);
L4=new Label("作者：");
L4.setBounds(20, 100, 50, 25);
panel1.add(L4,null);
L5=new Label("价格：");
L5.setBounds(20, 130, 50, 25);
panel1.add(L5,null);
T2=new TextField();
T2.setBounds(70, 70, 300, 25);
T2.addActionListener(new MyActionListener());//按【Enter】键
panel1.add(T2,null);
T3=new TextField();
T3.setBounds(70, 100, 300, 25);
T3.addActionListener(new MyActionListener());//按【Enter】键
panel1.add(T3,null);
T4=new TextField();
T4.setBounds(70, 130, 300, 25);
T4.addActionListener(new MyActionListener());//按【Enter】键
panel1.add(T4,null);
//==========================================
B1=new Button("第一条");
B1.setBounds(new Rectangle(30, 180, 65, 20));
B1.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B1_mouseClicked(e);//程序代码较多，写在另一个方法中
}
});
contentPane.add(B1);
B2=new Button("上一条");
B2.setBounds(100, 180, 65, 20);
B2.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B2_mouseClicked(e);
}
});
contentPane.add(B2);
B3=new Button("下一条");
B3.setBounds(170, 180, 65, 20);
B3.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B3_mouseClicked(e);
}
});
contentPane.add(B3);
B4=new Button("最末条");
B4.setBounds(240, 180, 65, 20);
B4.addMouseListener(new MouseAdapter()
{
@Override
public void mouseClicked(MouseEvent e) {
B4_mouseClicked(e);
}
});
contentPane.add(B4);
B5=new Button("新增");
B5.setBounds(30, 210, 65, 20);
B5.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B5_mouseClicked(e);
}
});
contentPane.add(B5);
B6=new Button("修改");
B6.setBounds(100, 210, 65, 20);
B6.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B6_mouseClicked(e);
}
});
contentPane.add(B6);
B7=new Button("删除");
B7.setBounds(170, 210, 65, 20);
B7.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B7_mouseClicked(e);
}
});
contentPane.add(B7);
B8=new Button("查询");
B8.setBounds(240, 210, 65, 20);
B8.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B8_mouseClicked(e);
}
});
contentPane.add(B8);
B9=new Button("确定");
B9.setBounds(310, 180, 65, 20);
B9.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B9_mouseClicked(e);
}
});
contentPane.add(B9);
B10=new Button("离开");
B10.setBounds(310, 210, 65, 20);
B10.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B10_mouseClicked(e);
}
});
contentPane.add(B10);
//==============================================
//控制画面操作过程
panel1.setEnabled(false); //其内的 TextField 将无法编辑文字
B9.setEnabled(false);
B10.setEnabled(false);
//==============================================
this.setBounds(200, 100, 415, 280);
this.setTitle("图书管理系统");
//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addWindowListener(new WindowAdapter()
{
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
this.setVisible(true);
//=========================================================
//加载JDBC Driver、连接数据库、送SELECT语句、返回结果集
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//载入JDBC Driver
ConnObj=DriverManager.getConnection("jdbc:odbc:myBook");
//连接ODBC设置的myBook数据源，jdbc:subprotocol:Alias
SQLStatement=ConnObj.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
//其后由此Statement对象执行SQL指令时，返回的会是可卷动且只读的ResultSet对象
RS=SQLStatement.executeQuery("select * from BookData");
//执行SELECT语句，会返回一个结果集
//查询myBook数据源的BookData数据表全部字段的记录
//必须先向下移到第一条：next(),因为一开始是指到第一条之前
//第一次调用 next 方法使第一行成为当前行
if(RS.next())
{
//RS内至少有一条记录，才会返回true
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
JOptionPane.showMessageDialog(this, "myBook数据库内，无任何数据");
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(frame, ex.getMessage());
}
}
class MyActionListener implements ActionListener
{ //T2、T3、T4都加入此ActionListener
public void actionPerformed(ActionEvent e)
{
((TextField)e.getSource()).transferFocus();//按【Enter】键,focus往下一个组件
}
}
void B1_mouseClicked(MouseEvent e)
{
try
{
RS.first();
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex){}
}
void B2_mouseClicked(MouseEvent e)
{
try
{
if(RS.previous())
{
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
RS.first();
JOptionPane.showMessageDialog(B2,"已到第一条");
}
}
catch(SQLException ex){}
}
void B3_mouseClicked(MouseEvent e)
{
try
{
if(RS.next())
{
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
RS.last();
JOptionPane.showMessageDialog(B3, "已到最末条");
}
}
catch(SQLException ex){}
}
void B4_mouseClicked(MouseEvent e)
{
try
{
RS.last();
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex){}
}
void B5_mouseClicked(MouseEvent e)
{ //新增一条数据
try
{
CurrentRow=RS.getRow(); //进行新增之前指到的这一条
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B5, ex.getMessage());
}
workingMode=MyBook.PREINSERT;
paintView();
T1.setText(""); //清空所有 TextField
T2.setText("");
T3.setText("");
T4.setText("");
T1.requestFocus(); //光标进入到 T1
}
void B6_mouseClicked(MouseEvent e)
{
workingMode=MyBook.TOUPDATE;
paintView();
try
{
CurrentRow=RS.getRow(); //现在更新这条的位置
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B6, ex.getMessage());
}
T2.requestFocus();
}
void B7_mouseClicked(MouseEvent e)
{ //删除一条数据
try
{
//记删除一条后要指到的位置
if(RS.isLast()&&(!RS.isFirst()))
{
//若删除是：最末条且非第一条
CurrentRow=RS.getRow()-1; //删除后要移到它的前一条
}
else
CurrentRow=RS.getRow(); //包括：不是最末条、是最末条又正是第一条
int choice=JOptionPane.showConfirmDialog(frame, "确定要删除现在这一条吗？");
if(choice==JOptionPane.YES_OPTION) //若用户单击“是(Y)”按钮
{
String deleteSQL="delete from BookData where ISBN='"+T1.getText().trim()+"'";
//System.out.println(deleteSQL); //可用于测试时
SQLStatement.executeUpdate(deleteSQL); //对数据库进行删除操作
RS=SQLStatement.executeQuery("select * from BookData");
if(RS.absolute(CurrentRow))
{ //移到刚才指的位置，若是删除最末条，会移到它的前一条
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
T1.setText("");
T2.setText("");
T3.setText("");
T4.setText("");
}
}
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(B7, ex.getMessage());
}
}
void B8_mouseClicked(MouseEvent e)
{ //查询数据
workingMode=MyBook.TOSELECT;
paintView();
try
{
CurrentRow=RS.getRow(); //目前指到的这一条
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B8, ex.getMessage());
}
}
void B9_mouseClicked(MouseEvent e)
{ //确定操作，用于新增、修改、查询
switch(workingMode)
{
case MyBook.TOINSERT:
ToInsert(); //确定要进行新增的操作
break;
case MyBook.TOUPDATE:
ToUpdate(); //确定要进行修改的操作
break;
case MyBook.TOSELECT:
ToSelect(); //确定要进行查询的操作
break;
default:
JOptionPane.showMessageDialog(B9, "目的不明！");
}
paintView(); //控制画面
}
//============================================================
/*用户单击“离开”按钮的情况:
* 1.进入新增模式，但不要新增
* 2.进入修改模式，但不要修改
* 3.进入查询模式，但不要查询，或是已经查询过了
*/
void B10_mouseClicked(MouseEvent e)
{ //离开新增、修改、查询模式
try
{
RS=SQLStatement.executeQuery("select * from BookData");
if(RS.absolute(CurrentRow))
{
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B10, ex.getMessage());
}
//无论对数据库的新增、修改、查询操作是否成功
workingMode=MyBook.BROWSE;
CurrentRow=1;
paintView(); //控制画面
}
void T1_actionPerformed(ActionEvent e)
{ //在T1内按【Enter】键会调用此方法
if(workingMode!=MyBook.PREINSERT)
{ //TOINSERT、TOUPDATE、TOSELECT 状态才有可能
T1.transferFocus(); //Focus移到下一个组件
return;
}
else
{ //PREINSERT 状态
if(T1.getText().trim().equals(""))
{
T1.requestFocus(); //令T1取得Focus
return;
}
}
String newISBN=T1.getText().trim();
if(newISBN.length()>13)
{ //数据不要超过数据表设置的字段长度
JOptionPane.showMessageDialog(T1, "ISBN 字段最大长度为 13！");
return;
}
//新增时先检查该条是否已存在
try
{
RS=SQLStatement.executeQuery("select * from BookData where ISBN='"+newISBN+"'");
if(RS.next())
{ //显示已存在的该条数据
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
JOptionPane.showMessageDialog(T1, "此条记录已存在");
}
else
{
workingMode=MyBook.TOINSERT; //不得再更改新的一条ISBN
T1.setText(newISBN);
}
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(T1, ex.getMessage());
}
paintView(); //控制画面
T1.transferFocus(); //Focus移到下个组件
}
void ToInsert()
{ //实际进行新增
int checkPrice; //用来检查价格
int insertCount=0;
boolean ifInserted=false; //记录是否成功新增
if(T2.getText().trim().equals("")
||T3.getText().trim().equals("")
||T4.getText().trim().equals("")
||T2.getText().trim().length()>50
||T3.getText().trim().length()>30)
{
JOptionPane.showMessageDialog(B9, "有数据尚未填写正确的值！");
return;
}
try
{
checkPrice=Integer.parseInt(T4.getText().trim());
}
catch(NumberFormatException ex)
{
JOptionPane.showMessageDialog(B9, "价格请填入整数，最大为2147483647");
return;
}
//========================================================================
String insertSQL="insert into BookData(ISBN,BookName,Author,Price)"
+"values('"+T1.getText().trim()
+"','"+T2.getText().trim()
+"','"+T3.getText().trim()
+"',"+T4.getText().trim()+")";
try
{
//System.out.println(insertSQL); //可用于测试时
insertCount=SQLStatement.executeUpdate(insertSQL);
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
try
{
RS=SQLStatement.executeQuery("select * from BookData");
if(insertCount!=0)
{
System.out.println("Insert OK"); //可用于测试时
RS.last(); //若新增成功，就移到最末条
}
else
RS.absolute(CurrentRow);//若失败则移到刚才浏览时指的那条
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
//无论对数据库的新增操作是否成功
workingMode=MyBook.BROWSE;
CurrentRow=1;
}
void ToUpdate()
{ //实际进行修改
int checkPrice; //用来检查价格
if(T2.getText().trim().equals("")
||T3.getText().trim().equals("")
||T4.getText().trim().equals("")
||T2.getText().trim().length()>50
||T3.getText().trim().length()>30)
{
JOptionPane.showMessageDialog(null, "有数据尚未填写正确的值！");
return;
}
try
{
checkPrice=Integer.parseInt(T4.getText().trim());
}
catch(NumberFormatException ex)
{ //所填的文字，字面意义若非int整数，转型会失败
JOptionPane.showMessageDialog(null, "价格请填入整数，最大为2147483647");
return;
}
//==================================================
String updateSQL="update BookData set BookName='"+T2.getText().trim()
+"',Author='"+T3.getText().trim()
+"',Price="+T4.getText().trim()
+" where ISBN='"+T1.getText().trim()+"'";
System.out.println(updateSQL);
try
{
SQLStatement.executeUpdate(updateSQL);
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
try
{
RS=SQLStatement.executeQuery("select * from BookData");
RS.absolute(CurrentRow); //移到修改的那条
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
//无论对数据库的修改操作是否成功
workingMode=MyBook.BROWSE;
CurrentRow=1;
}
void ToSelect()
{ //实际进行查询
String condi="";
if(T1.getText().trim().equals("")
&&T2.getText().trim().equals("")
&&T3.getText().trim().equals("")
&&T4.getText().trim().equals(""))
{
JOptionPane.showMessageDialog(B8, "至少要填一个字段当条件");
return;
}
//=============================================================
if(!T1.getText().trim().equals("")) //若用户有填ISBN当条件
condi=" ISBN='" + T1.getText().trim() + "'";
if(!T2.getText().trim().equals("")) //若用户有填BookName当条件
if(condi.equals(""))
condi=" BookName='" + T2.getText().trim() + "'";
else
condi=condi + " AND BookName='" + T2.getText().trim() + "'";
if(!T3.getText().trim().equals("")) //若用户有填Author当条件
if(condi.equals(""))
condi=" Author='" + T3.getText().trim() + "'";
else
condi=condi + " AND Author='" + T3.getText().trim() + "'";
if(!T4.getText().trim().equals("")) //若用户有填Price当条件
if(condi.equals(""))
condi=" Price=" + T4.getText().trim();
else
condi=condi + " AND Price=" + T4.getText().trim();
String selectSQL="select * from BookData where" + condi;
System.out.println(selectSQL); //可用于测试时
try
{
RS=SQLStatement.executeQuery(selectSQL);
if(RS.next())
{ //有查到一条以上符合的记录
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{ //没查到符合的记录
T1.setText("");
T2.setText("");
T3.setText("");
T4.setText("");
}
}
catch(SQLException ex)
{
JOptionPane.showMessageDialog(B9, ex.getMessage());
}
workingMode=MyBook.SELECTED; //已查询
//查完还要回到之前记录的CurrentRow
}
void paintView()
{ //控制画面，即控制用户的操作过程
switch(workingMode)
{
case MyBook.BROWSE:
L1.setText("状态： 浏览模式");
break;
case MyBook.PREINSERT:
L1.setText("状态： 新增模式 - 输入ISBN后按键盘【Enter】键");
break;
case MyBook.TOINSERT:
L1.setText("状态： 新增模式");
break;
case MyBook.TOUPDATE:
L1.setText("状态：修改模式");
break;
case MyBook.TOSELECT:
L1.setText("状态： 查询模式");
break;
case MyBook.SELECTED:
L1.setText("状态： 查询结果");
break;
}
//============================================================
if(workingMode==MyBook.TOINSERT||workingMode==MyBook.TOUPDATE)
T1.setEditable(false);
else
T1.setEditable(true);
//============================================================
if(workingMode==MyBook.PREINSERT)
{
T2.setEnabled(false);
T3.setEnabled(false);
T4.setEnabled(false);
}
else
{
T2.setEnabled(true);
T3.setEnabled(true);
T4.setEnabled(true);
}
//=============================================================
if(workingMode==MyBook.BROWSE||workingMode==MyBook.SELECTED)
{
panel1.setEnabled(false); //此时光标不可进入其内的T1-T4
B1.setEnabled(true);
B2.setEnabled(true);
B3.setEnabled(true);
B4.setEnabled(true);
}
else
{
panel1.setEnabled(true);
B1.setEnabled(false);
B2.setEnabled(false);
B3.setEnabled(false);
B4.setEnabled(false);
}
//=============================================================
if(workingMode==MyBook.BROWSE)
{
B5.setEnabled(true);
B6.setEnabled(true);
B7.setEnabled(true);
B8.setEnabled(true);
}
else
{
B5.setEnabled(false);
B6.setEnabled(false);
B7.setEnabled(false);
B8.setEnabled(false);
}
//==============================================================
if(workingMode==MyBook.TOINSERT||workingMode==MyBook.TOUPDATE||workingMode==MyBook.TOSELECT)
B9.setEnabled(true);
else
B9.setEnabled(false);
//==============================================================
if(workingMode!=MyBook.BROWSE)
B10.setEnabled(true);
else
B10.setEnabled(false);
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
new MyBook();
}
}
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