java我从MySql得到异常，它不会更新表吗？

Question

当我在click event上传递按钮时，所有Jcomponats值都为，它不会更新我的表，而是在我的代码在其他表中正常工作时，它会反映异常

private void update() {
    String id = txtPcno.getText();
    String updateQuery = "insert into n_patient (name, gender, NRIC, nationality, height, weight, smoke, last_seen) values(?,?,?,?,?,?,?,?)";
    try {
        pst = con.prepareStatement(updateQuery);

        //pst.setString(1, txtPcno.getText());
        pst.setString(1, txtName.getText());
        pst.setString(2, txtGender.getText());
        pst.setString(3, txtNRIC.getText());
        pst.setString(4, txtNationality.getText());
        pst.setString(5, txtHeight.getText());
        pst.setString(6, txtWeight.getText());
        pst.setString(7, txtSmoke.getText());
        pst.setString(8, txtLastSeen.getText());

        int rowAffected = pst.executeUpdate();

        JOptionPane.showMessageDialog(null, String.format(" %d Modified Records Are Saved ", rowAffected));
        clear();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Here is the Image of indication Problem