JDBC and using update statements

Question

I have a program that connects to a microsoft access DB using JDBC-ODBC Bridge, but i dnt know how to write a correct update statement. I use servlets & it should call a function that retrieves a specific value, adds 1 to that integer value and updates the DB,but it didn't work. i also need to know how to delete all records in a DB.
Thanks in advance

Answer 1

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.sql.*;
public class first_count extends HttpServlet {
   private Statement statement = null;
   private Connection connection = null;
   private String URL = "jdbc:odbc:rjdemo";
   public void init( ServletConfig config )
      throws ServletException
      super.init( config );
      try {
  Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
      connection =DriverManager.getConnection( URL, "", "" );
        }//try
       catch ( Exception e )
         e.printStackTrace();
         connection = null;
      }//catch
   public void doPost( HttpServletRequest req,
                       HttpServletResponse res )
      throws ServletException, IOException
      String cnt;
      cnt = req.getParameter( "big" );
//takes the parameter of a radio button in a form
     PrintWriter out = res.getWriter();
      res.setContentType( "text/html" );
     if ( cnt.equals("big1"))
//if the value of the radio button equals big1
         int i=0;
         out.println("The number retrieved = " + big_counter(i));
                  }//if
        out.close();
int big_counter(int i)
      try {
         i=0;
         statement = connection.createStatement();
         ResultSet r= statement.executeQuery("select beg_count from User");
         r.first();
         i=r.getInt("beg_count");
//the name of column is beg_count it's a number
         i++;
         statement.executeUpdate("UPDATE User SET beg_count="+i);
         statement.close();
      }//try
      catch ( Exception e )
      }//catch
return i;
   public void destroy()
      try {
         connection.close();
      catch( Exception e ) {