使用准備好的語句更新

Question

我想更新我的數據庫

1. 當我在按JButton OK之后在jTextbox中輸入客戶ID時，將從數據庫中提取的所有相應數據顯示在代碼中其余的jTextfield中

2. 在顯示了該特定客戶ID的所有相應數據庫之后，這些數據庫再次進行了更新以進行更新，然后單擊Update JButton之后，所有相應數據都將更新相應的客戶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

可能是因為您的字段類型（尤其是customer_id ）不是字符串。 嘗試這樣的事情：

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)
    {
    }