基于JAVA的图书数据库管理-具有新增，修改，删除，查询功能
作者：互联网
结构类型JDBC-ODBC bridge plus ODBC driver；数据库采用Access。数据源是在ODBC设置好的“myBooK”。源程序如下：（最为练习，修改删除查询功能只留接口，没有编码实现）
import java.awt.*;
import java.awt.event.*;
//import java.beans.Statement;
import java.sql.*;
import javax.swing.*;
public class j03160301 extends JFrame{
Connection ConnObj;
Statement SQLStatement;
ResultSet RS;
JPanel contentPane;
Panel panel1;
Label L1,L2,L3,L4;
TextField T1,T2,T3,T4;
Button B1,B2,B3,B4,B5,B6,B7,B8,B9,B10;
public j03160301(){
contentPane=(JPanel)this.getContentPane();
contentPane.setLayout(null);
panel1=new Panel();
//panel1.setBackground(BLACK);
panel1.setBounds(0, 0, 380, 160);
panel1.setLayout(null);
panel1.setEnabled(false);
contentPane.add(panel1);
L1=new Label("ISBM: ");
L1.setBounds(20, 40, 50, 25);
panel1.add(L1);
L2=new Label("bookname: ");
L2.setBounds(20, 70, 50, 25);
panel1.add(L2);
L3=new Label("auther: ");
L3.setBounds(20, 100, 50, 25);
panel1.add(L3);
L4=new Label("price: ");
L4.setBounds(20, 130, 50, 25);
panel1.add(L4);
T1=new TextField();
T1.setBounds(70, 40, 300, 25);
T1.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e){
T1_actionPerformed(e);
}
});
panel1.add(T1);
T2=new TextField();
T2.setBounds(70, 70, 300, 25);
T2.addActionListener(new myActionListener());
panel1.add(T2);
T3=new TextField();
T3.setBounds(70, 100, 300, 25);
T3.addActionListener(new myActionListener());
panel1.add(T3);
T4=new TextField();
T4.setBounds(70, 130, 300, 25);
T4.addActionListener(new myActionListener());
panel1.add(T4);
B1=new Button("第一条");
B1.setBounds(new Rectangle(30,180,65,20));
B1.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B1_mouseClicked(e);
}
});
contentPane.add(B1);
B2=new Button("上一条");
B2.setBounds(new Rectangle(100,180,65,20));
B2.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B2_mouseClicked(e);
}
});
contentPane.add(B2);
B3=new Button("下一条");
B3.setBounds(new Rectangle(170,180,65,20));
B3.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B3_mouseClicked(e);
}
});
contentPane.add(B3);
B4=new Button("最末条");
B4.setBounds(new Rectangle(240,180,65,20));
B4.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e)
{
B4_mouseClicked(e);
}
});
contentPane.add(B4);
B5=new Button("新增");
B5.setBounds(new Rectangle(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.setEnabled(false);//因为这些功能暂时没有写。
contentPane.add(B6);
B7=new Button("删除");
B7.setBounds(170, 210, 65, 20);
B7.setEnabled(false);
contentPane.add(B7);
B8=new Button("查询");
B8.setBounds(240, 210, 65, 20);
B8.setEnabled(false);
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);
this.setBounds(200,100, 415, 280);
this.setTitle("新增");
this.addWindowListener(new WindowAdapter()
{
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");//加载数据库驱动程序；
ConnObj=DriverManager.getConnection("jdbc:odbc:myBook");//连接ODBC设置的myBook数据源；
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制度的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；
if(RS.next())
{
//RS内至少有一条记录才会返回true，有一条记录才能读取这条记录个字段的数据；
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
//前三个字段都是文字，最后一个是长整数；
}
else
JOptionPane.showMessageDialog(this, "myBook数据库内无任何数据");
}catch(Exception ecp)
{
JOptionPane.showMessageDialog(this, ecp.getMessage());
}
}//public j03160301() end
class myActionListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
((TextField)e.getSource()).transferFocus();//按下回车键，focus往下一个组件
}
}
protected void T1_actionPerformed(ActionEvent e) {
//新增时先检验该条是否已经存在
if(T1.getText().trim().equals(""))
return;
String newISBN=T1.getText().trim();
if(newISBN.length()>13)
{
JOptionPane.showMessageDialog(T1, "ISBN字段最大长度为13");
return;
}
try
{
RS=SQLStatement.executeQuery(
"SELECT * FROM BookData WHERE ISBN='"+newISBN+"'");
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")));
JOptionPane.showMessageDialog(T1, "此笔数据已存在");
}
else{//不得再更改新的一条ISBN
panel1.setEnabled(true);
T1.setText(newISBN);
T1.setEditable(true);
T2.setEnabled(true);
T3.setEnabled(true);
T4.setEnabled(true);
B9.setEnabled(true);
T2.requestFocus();
}
}catch(SQLException o){System.out.println(o.getMessage());}
}
void B1_mouseClicked(MouseEvent e)
{
try
{
RS.first();//move to the first item
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}catch(SQLException ecp){}
}//B1_mouseClicked(MouseEvent e) end;
void B2_mouseClicked(MouseEvent e)
{
try
{
if(RS.previous())
{//move to the previous item
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
//返回false表示移到了第一条之前
RS.first();//再移到第一条；
JOptionPane.showMessageDialog(B2, "移到第一条");
//不需要改变T1-T4的文字，因为刚才已经显示第一条内容
}
}catch(SQLException ecp){}
}//B2_mouseClicked(MouseEvent e) end;
void B3_mouseClicked(MouseEvent e)
{
try
{
if(RS.next())
{//move to the next item
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}
else
{
//返回false表示移到了最末条之后
RS.last();//再移到最末条；
JOptionPane.showMessageDialog(B3, "移到最末条");
//不需要改变T1-T4的文字，因为刚才已经显示第一条内容
}
}catch(SQLException ecp){}
}//B3_mouseClicked(MouseEvent e) end;
void B4_mouseClicked(MouseEvent e)
{
try
{
RS.last();//move to the last item
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}catch(SQLException ecp){}
}//B4_mouseClicked(MouseEvent e) end;
void B5_mouseClicked(MouseEvent e)
{
T1.setText(" ");
T2.setText(" ");
T3.setText(" ");
T4.setText(" ");
panel1.setEnabled(true);
T2.setEnabled(false);
T3.setEnabled(false);
T4.setEnabled(false);
B1.setEnabled(false);
B2.setEnabled(false);
B3.setEnabled(false);
B4.setEnabled(false);
B5.setEnabled(false);
B9.setEnabled(true);
B10.setEnabled(true);
/*try
{
RS.last();//move to the last item
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}catch(SQLException ecp){}*/
}//B4_mouseClicked(MouseEvent e) end;
void B9_mouseClicked(MouseEvent e) {//确认插入按钮；
ToInsert();
}
private void ToInsert() {
int checkPrice;
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, "有数据尚未填正确的值");
return;
}
try//检查价格
{
checkPrice=Integer.parseInt(T4.getText().trim());
}catch(NumberFormatException o)
{
JOptionPane.showMessageDialog(B9, "价格请填入整数");
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);
SQLStatement.executeUpdate(insertSQL);
}catch(SQLException o){
JOptionPane.showMessageDialog(B9, o.getMessage());
}
try
{
RS=SQLStatement.executeQuery("SELECT *FROM BookData");
RS.last();//移动到最后一条，因为增加的数据会加到数据库的最后一条后面；
T1.setText(RS.getString("ISBN"));
T2.setText(RS.getString("BookName"));
T3.setText(RS.getString("Author"));
T4.setText(String.valueOf(RS.getInt("Price")));
}catch(SQLException o){JOptionPane.showMessageDialog(B9, o.getMessage());}
}
void B10_mouseClicked(MouseEvent e) {//清除按钮；
try
{
RS=SQLStatement.executeQuery("SELECT * FROM BookData");
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")));
}
}catch(SQLException o)
{JOptionPane.showMessageDialog(B10,o.getMessage());}
//控制画面操作过程
panel1.setEnabled(true);
T1.setEnabled(true);
T2.setEnabled(true);
T3.setEnabled(true);
T4.setEnabled(true);
B1.setEnabled(true);
B2.setEnabled(true);
B3.setEnabled(true);
B4.setEnabled(true);
B5.setEnabled(true);
B9.setEnabled(false);
B10.setEnabled(false);
}
public static void main(String[] args)
{
new j03160301();
}
}
转载于:https://my.oschina.net/u/2610176/blog/600952
标签：setEnabled,JAVA,getString,RS,数据库,查询,new,T1,setText 来源： https://blog.csdn.net/chunjue5495/article/details/100760981