3 编写代码
将代码保存在jdbc.java文件中：
import java.awt.*;import java.awt.event.*;import java.sql.*;
public class jdbc //定义主类
{
public static void main(String args[])
{
GUI gui=new GUI(); //创建类GUI的对象
gui.pack(); //装载执行GUI类
}
}
class GUI extends Frame implements Action Listener
{
TextArea text; Panel panel; TextField sno; Button btn;
GUI() //构造方法
{
super("物资情况查询");setLayout(new BorderLayout());
setBackground(Color.cyan);
setVisible(true);text=new TextArea();
btn=new Button("查询");
sno=new TextField(16);
panel=new Panel();
panel.add(new Label("输入被查询的物资编号："));
panel.add(sno); panel.add(btn);
add("North",panel); add(text,"Center");
text.setEditable(false);btn.addActionListener(this);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
setVisible(false);
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==btn) //当用户按下查询按钮时
{
text.setText("查询结果" '\n'); //显示提示信息
try
{
Liststudent();
}
catch(SQLException ee) { }
}
}
public void Liststudent() throws SQLException //针对数据库的操作
{
String bh,mc,xh,lb,dw,sj;
int sl; float dj,je;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e) { }
Connection con=DriverManager.getConnection("jdbc:odbc:wzgl");
Statement sql=con.createStatement(); //创建Statement对象
ResultSet rs=sql.executeQuery("select * from wuzi");
while(rs.next()) //输出被查询的情况
{
bh=rs.getString("物资编号");
mc=rs.getString("物资名称");
xh=rs.getString("规格型号");
lb=rs.getString("类别");
dw=rs.getString("计量单位");
sl=rs.getInt("数量");
dj=rs.getFloat("单价");
je=rs.getFloat("金额");
sj=rs.getDate("时间").toString();
if(bh.trim().equals(sno.getText().trim()))
{
text.append('\n' "物资编号" " " "物资名称" " " "规格型号" " " "类别" " " "计量单位" " " "数量" " " "单价" " " "金额" " " "时间" '\n');
text.append('\n' bh " " mc " " xh " " lb " " dw " " sl " " dj " " je " " sj " " '\n');
}
}
}
}
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