Java 从数据库中检索值并显示在文本字段中
您看到无法获取值并将其放回文本字段…以下是脏的示例代码,可能有助于解决您的问题Java 从数据库中检索值并显示在文本字段中,java,database,jdbc,Java,Database,Jdbc,您看到无法获取值并将其放回文本字段…以下是脏的示例代码,可能有助于解决您的问题 DBUtil util = new DBUtil(); try { JOptionPane.showMessageDialog(null, "Connection Opened!"); Connection con = util.getConnection(); PreparedStatement stmt = con.pr
DBUtil util = new DBUtil();
try {
JOptionPane.showMessageDialog(null, "Connection Opened!");
Connection con = util.getConnection();
PreparedStatement stmt = con.prepareStatement("SELECT (SUM(box_no),SUM(weight),SUM(TP),SUM(TV)) FROM dbo.mut_det WHERE rm_id=?");
stmt.setInt(1, Integer.parseInt(rm));// but how to get values from textfield dont know.
//*and how to put these called values SUM(box_no),SUM(weight),SUM(TP),SUM(TV) in textfields dnt know.*//
//my textfields are txtboxno, txtweight, txttp, txttv
stmt.execute();
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, ex.getMessage());
Logger.getLogger(Demo.class.getName()).log(Level.SEVERE, null, ex);
}
请帮助guyz…!!:-(您在编写SQL时遇到了什么具体问题?接口的一部分?我看到了插入代码;您尝试了什么搜索功能?我使用了…/*CallableStatement stmt=con.CallableStatement(“从dbo.mut det WHERE(rm_id=?)中选择(rm_id,SUM(box_no),SUM(weight),SUM(TP),SUM(TV));*//但它不起作用我得到了你想要做的,但我没有得到你遇到的问题?还有一件事不要把你的代码放在评论框中。这会使这里无法阅读。哦,很抱歉-(好吧,我想从文本字段中获取rm_id的值:tf_rm_id,并且我想将调用的记录显示到我的另一个文本字段中,但我不想这样做,因此我请求帮助.)。。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TextDemo extends JFrame implements ActionListener {
JTextField textData;
JButton button = new JButton("Press Me");
public TextDemo() {
JPanel myPanel = new JPanel();
add(myPanel);
myPanel.setLayout(new GridLayout(3, 2));
myPanel.add(button);
button.addActionListener(this);
textData = new JTextField();
myPanel.add(textData);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == button) {
String data = textData.getText(); // perform your DB operation
textData.setText(data + " This is new text"); // Set your DB values.
}
}
public static void main(String args[]) {
TextDemo g = new TextDemo();
g.setLocation(10, 10);
g.setSize(300, 300);
g.setVisible(true);
}
}