Error in fetching the data from textfield and inserting to the database..

Question

I'm using Java Swing as front end and MySQL as backend using the netbeans ide..I am trying to fetch the data from the textfiled in the form and insert to the database table.i've skipped the generated code..In the following code i get the erro cannot find symbol "stmt" in the actionPerformed method..
mport java.awt.event.*;
import java.sql.*;
public class BarcodeReader extends JFrame implements ActionListener {
public BarcodeReader() {
initComponents();
nb.addActionListener(this);
public void jdbcConnect(){
Connection con=null;
String url = "jdbc:mysql://localhost:3306/";
String db = "mynewdatabase";
String driver = "com.mysql.jdbc.Driver";
String user = "usrname";
String pass = "pwd";
try{
String s=newtxt.getText();
con=DriverManager.getConnection(url + db, user, pass);
Statement stmt=con.createStatement();
Class.forName(driver);
public void actionPerformed(ActionEvent e){
try{
jdbcConnect();
stmt.executeUpdate("INSERT into machine(mname) values '"+jTextField1.getText()+"'");
}}catch (Exception ex) {
System.out.println(ex);
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new BarcodeReader().setVisible(true);
}

Answer 1

There are far too many errors to try and clear.
For one, the exception references the actionPerformed method (according to your text), so why is that not shown here?
For another you are performing, possible time-consuming, actions, and even worse IO actions, on the event thread, which is a huge no-no.
You are not closeing your resources properly, if at all, which is another huge no-no.
You are completely mixing your "view" (the gui), and your "model" (the data related classes), which is another huge no-no.
etc, etc, etc.