What's the differences between connectors the old ones and newest ones?

Question

i developed an application with tomcat jakarta 5.1-mysql-java servlets, and i had been using the mysql-connector-java-3.1.8-bin.jar connector a little old uh, my question is what is the differences between the last mencionated and this version mysql-connector-java-5.0.0-beta-bin.jar, you say "just the version", i mean, i know there are many changes in the new ones but i don't like the idea to change all my application, and i would like to know what changes i have to do for update and compiling with them. i.e. i always did it like this:
import java.sql.*;
public class MultiUsos {
private final static String log = "x";
private final static String pswd = "x";
private final static String Bd = "x";
private final static String URL = "jdbc:mysql://localhost:3306/"+Bd;
private Connection con = null;
private ResultSet rs = null;
private Statement stmt = null;
private Conexion conexion = null;
public int insert(String query) throws SQLException {
try {
con = conexion.getConexion(URL,log,pswd);
con.setAutoCommit(false);
if(con != null) {
stmt = con.createStatement();
r = stmt.executeUpdate(query);
stmt.close();
else System.out.print("� No existe conexion !");
catch(SQLException e) {
System.out.print("Error MySQL: ");
e.printStackTrace();
r = 0;
return r;
con.commit();
return r;
public void liberaConexion() {
try {
stmt.close();
con.commit();
con.close();
catch(Exception e) {
and i looked this example in new connectors:
PreparedStatement pstmt = connection.prepareStatement("insert into......
and things like that, i don't know if there were the same method in the older versions but if this is exclusive new for connectors, i'm fried.
i will apreciate all comments and help, and sorry about my not good english.
thanks.

Answer 1

and i looked this example in new connectors:
PreparedStatement pstmt =
connection.prepareStatement("insert into......
and things like that, i don't know if there were the
same method in the older versions but if this is
exclusive new for connectors, i'm fried.I am not sure if I understood your problem correctly but as I understand, you are worried because of the examples of PreparedStatement. That is an object representing a precompiled SQL statement. It is a part of the JDBC API, the same as Statement. There are several situations where the use of PreparedStatement is better than the usual Statement but this does not make the Statement obsolete.
I would suggest you to read the JDBC tutorial
http://java.sun.com/docs/books/tutorial/jdbc/
especially the section dealing with the use of PreparedStatement.
http://java.sun.com/docs/books/tutorial/jdbc/basics/prepared.html
In general, it is better if you go through the complete tutorial and understand the features which are provided in the JDBC API.
Hope I was helpful.