Opening dbs thru button events, help, i`m a newbie..

Question

i have the following fn for opening the db
public static void main(String args[]) throws Exception
new login(new javax.swing.JFrame(), true).show();
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
open();
select();
static void open() throws SQLException
// ODBC data source name
String dsn = "jdbc:odbc:dslogin";
String user = "";
String password = "";
// Connect to the database
con = DriverManager.getConnection(dsn, user, password);
// Shut off autocommit
con.setAutoCommit(false);
static void select() throws SQLException
Statement stmt; // SQL statement object
String query; // SQL select string
ResultSet rs; // SQL query results
boolean more; // "more rows found" switch
query = "select user,password from dblogin";
stmt = con.createStatement();
rs = stmt.executeQuery(query);
// Check to see if any rows were read
more = rs.next();
if (!more) {
System.out.println("No rows found.");
return;
// Loop through the rows retrieved from the query
while (more)
// System.out.println("kkkk");
System.out.println("umm" + rs.getString("user"));
System.out.println("ummmm" + rs.getString("password"));
more = rs.next();
rs.close();
stmt.close();
now my problem is this..while the above open and select fns work fine in void main, i`m trying to open the db upon clicking a button..heres what i tried to do :
cmdsubmit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
cmdsubmitActionPerformed(evt);
private void cmdsubmitActionPerformed(java.awt.event.ActionEvent evt) {
open();
seelct();
when i try it i get the error message exceptions must be caught or throw or sumthing like that and i`m new to java so i`ve no idea how to go about doing it..help please..

Answer 1

On JDBC:
You only need to register a driver with the DriverManager once, and this is done (by JDBC conform drivers) when the driverclass is loaded. You may want to do this in a static initializer:
import java.sql.*;
class MyClass{
    static {
        try {
            // load driver class, which automatically registers itself
            Class.forName("sun.jdbc....");
        } catch(Exception ex) { /* handle it, throw error */ }
    // later
    Connection con = DriverManager.getConnection(...);
}Even better is NOT to hard-code the driver at all. Use
java -Djdbc.drivers=sun.jdbc.odbc.JdbcOdbcDriver;oracle.jdbc.OracleDriver MyClassinstead.
Fritz