Question

我想更新我的数据库

当我在jTextbox中输入客户ID后，按JButton OK然后从数据库中提取所有相应的数据显示在代码中剩余的jTextfield中

在显示为了更新目的而再次编辑的特定客户ID的所有相应数据库之后，在点击更新JButton之后，所有相应数据都会更新各自的客户ID

import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;

public abstract class customer_details extends JFrame implements ActionListener
{
JTextField textFieldId;
JTextField textFieldId1;
JTextField textFieldId2;
JTextField textFieldId3;    
JLabel l1;
JLabel l2;
JLabel l3;
JLabel l4;
JLabel l5;
JButton b1,b2;
Container c = getContentPane();
customer_details()
{
super("Shree Datta Digambar");
setBounds(140,250,777,555);
c.setLayout(null);
textFieldId = new JTextField();        
textFieldId1 = new JTextField();
textFieldId2 = new JTextField();
textFieldId3 = new JTextField();
this.setExtendedState(JFrame.MAXIMIZED_BOTH);
l1 = new JLabel("Update Customer Details:-");
l2 = new JLabel("Customer Id");
l3 = new JLabel("Customer Id");
l4 = new JLabel("Name");
l5 = new JLabel("Contact");
l1.setBounds(10,10,340,20);
l2.setBounds(10,20,140,70);
l3.setBounds(10,100,140,70);
l4.setBounds(100,100,140,70);
l5.setBounds(270,100,140,70);
textFieldId.setBounds(10,70,70,20);         
textFieldId1.setBounds(10,160,70,20); 
textFieldId2.setBounds(100,160,150,20); 
textFieldId3.setBounds(270,160,90,20); 
b1 = new JButton("Ok");
b1.setBounds(100,70,50,20);   
b2 = new JButton("Update");
b2.setBounds(380,160,90,20);  
c.add(b1);
c.add(b2);
c.add(l1);
c.add(l2);
c.add(l3);
c.add(l4);
c.add(l5);
c.add(textFieldId);
c.add(textFieldId1);
c.add(textFieldId2);
c.add(textFieldId3);       
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);                
b1.addActionListener(this);               
b2.addActionListener(this);
 }
public static void main(String[] args) 
{
customer_details eeap=new customer_details() {};
 }
@Override
public void actionPerformed(ActionEvent e)
{               
System.out.println("You clicked the button");             
if(e.getSource()==b1)
{
    try 
    {
        Connection con;                
        con = DriverManager.getConnection("jdbc:odbc:Dalvi");                                       
        java.sql.Statement st = con.createStatement();
        PreparedStatement ps = con.prepareStatement("SELECT 
        customer_id,customer_name,customer_contact FROM customer_details WHERE 
        customer_id = ?");                          
        ps.setString(1,textFieldId.getText());
        ResultSet rs1=ps.executeQuery();
        while(rs1.next())
        {                   
            textFieldId1.setText(rs1.getString(1));
            textFieldId2.setText(rs1.getString(2));
            textFieldId3.setText(rs1.getString(3));   
        }                    
    }
    catch (SQLException s) 
    {
        System.out.println("SQL code does not execute.");
        JOptionPane.showMessageDialog(null,"Please Enter the Detail Correctly");
    }
    } 
    if(e.getSource()==b2)
    {
    try
    {
        Connection con;                
        con = DriverManager.getConnection("jdbc:odbc:Dalvi");                                       
        java.sql.Statement st = con.createStatement();
        PreparedStatement ps = con.prepareStatement("UPDATE customer_details
        SET customer_id = ? ,customer_name = ?, customer_contact =? 
        WHERE customer_id= ?");                          
        ps.setString(1,textFieldId1.getText());   
        ps.setString(2,textFieldId2.getText());
        ps.setString(3,textFieldId3.getText());
        ps.setString(4,textFieldId.getText()); 
        ps.executeUpdate();
        }
       catch (SQLException s) 
       {
        System.out.println("SQL code does not execute.");
         JOptionPane.showMessageDialog(null,"Please Enter the Detail Correctly");
         }        }     }   }

Answer 1

可能是因为您的字段类型，尤其是customer_id，不是字符串。尝试这样的事情：

try (
        Connection con = DriverManager.getConnection("jdbc:odbc:Dalvi");
        PreparedStatement ps = con.prepareStatement("UPDATE customer_details SET customer_id = ?, customer_name = ? , customer_contact =?  WHERE customer_id = ?");
    )
{
    ps.setInt(1, Integer.parseInt(textFieldId.getText()));    
    ps.setString(2,textFieldId1.getText());
    ps.setString(3,textFieldId2.getText());
    ps.setInt(4, Integer.parseInt(textFieldId3.getText()));
    ps.executeUpdate();
}
catch (SQLException s) 
{
    System.out.println("SQL code does not execute.");
    JOptionPane.showMessageDialog(null,"Please Enter the Detail Correctly");
}
    catch (NumberFormatException e)
    {
    }

使用预准备语句更新

1 个答案: