JSP JavaBeans and Database

Question

i am wondering whats the "correct" or best way to connect to a DB using JavaBeans and using this in JSP pages?
i read abt creating a SQL "Helper" class that has some functions like connect etc... but i am thinking its a bit confusing...
if i have a function
    public static Statement Connect() {
        try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            con = DriverManager.getConnection("jdbc:odbc:auction","","");
            stmt = con.createStatement();
        } catch (SQLException e) {
            System.out.println("ERROR: SQLException occured!\n" + e.getMessage());
        } catch (Exception e) {
            System.out.println("ERROR: An Exception occured!\n" + e.getMessage());
       return stmt;
    }then i use it
Statement stmt = SqlHelper.connect();when i want to close the connection how do i do it? is it a must to close connections anyway?
or shld i do it the easy way, having the code
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:auction","","");
stmt = con.createStatement();on all JSP pages?
Thank you

Answer 1

BalusC wrote:Do it in the data layer. Write DAO classes and SQL helper classes. Then let the business layer, the Servlet, interact with the data layer and let the presentation layer, the JSP, display the results.
And don't return a Statement, but a Connection. And yes, closing a Connection is a must, otherwise you're leaking resources which will cause your web application to crash due to a memory shortage.ya thats what i am trying to do... but how do i? like this? except i return a connection instead? and also, i shld return it by reference? mmm... in java isit like return &con?
package AuctionSystem;
import java.sql.*;
public class SqlHelper {
    private static Connection con;
    private static Statement stmt;
    public SqlHelper() {
        Connection con = null;
        Statement stmt = null;
    public static void Connect() {
        try {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            con = DriverManager.getConnection("jdbc:odbc:auction","","");
            stmt = con.createStatement();
        } catch (SQLException e) {
            System.out.println("ERROR: SQLException occured!\n" + e.getMessage());
        } catch (Exception e) {
            System.out.println("ERROR: An Exception occured!\n" + e.getMessage());
    public static Connection getCon() {
        return con;
    public static Statement getStmt() {
        return stmt;
    public static void Close() {
        con.close();
        stmt.close();
    public static String FormatString(String string) {
        return "'" + string + "'";
}Edited by: iceangel89 on May 27, 2008 3:50 AM