SeuProjeto
   WEB-INF
     classes
     lib
     src
   work

hibernate.connection.driver_class = com.mysql.jdbc.Driver
hibernate.connection.url = jdbc:mysql://localhost:3306/SeuProjeto
hibernate.connection.username = usuario
hibernate.connection.password = senha

public class Usuario {
	private String usCod;
	private String usSenha;
	private String usNome;
	private String usEmail;

	public Usuario(){
	}		 

	public Usuario(String usCod, String usSenha, String usNome, String usEmail) {
		this.setUsCod(usCod);
		this.setUsSenha(usSenha);
		this.setUsNome(usNome);
		this.setUsEmail(usEmail);
	}

//... IMPORTANTE: colocar os métodos GETs e SETs... 

}

import java.util.List;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
import org.hibernate.criterion.Expression;

public class UsuarioDAO{
	
	private SessionFactory factory;
	
	public UsuarioDAO() throws Exception{
		factory = new Configuration().addClass(Usuario.class).buildSessionFactory();
		
	}     
	
	public void UsInserir(Usuario us) throws Exception {
		Session session = factory.openSession();
		session.save(us);
		session.flush();
		session.close();
	}
	
	public void UsAlterar(Usuario us) throws Exception {
		Session session = factory.openSession();
		session.update(us);
		session.flush();
		session.close();
	}
	public void UsExcluir(Usuario us) throws Exception {
		Session session = factory.openSession();
		session.delete(us);
		session.flush();
		session.close();
	}
}

< ?xml version="1.0"?>
< !DOCTYPE hibernate-mapping PUBLIC "-//Hibernate Mapping DTD 3.0//EN" 
"hibernate-mapping-3.0.dtd">

< hibernate-mapping>
   < class name="Usuario" table="tb_usuarios">
       < id name="UsCod"  column="USCOD"  type="string">
            < generator class="assigned"/>
        < /id>
        < property name="UsSenha" column="USSENHA" type="string"/>
        < property name="UsNome" column="USNOME" type="string"/>
        < property name="UsEmail" column="USEMAIL" type="string"/>
    < /class>
< /hibernate-mapping>

/*
MySQL Data Transfer
Source Host: localhost
Source Database: seuprojeto
Target Host: localhost
Target Database: seuprojeto
Date: 24/11/2006 06:11:53
*/

SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for tb_usuario
-- ----------------------------
CREATE TABLE `tb_usuario` (
  `USCOD` varchar(50) NOT NULL default '',
  `USSENHA` varchar(50) default NULL,
  `USNOME` varchar(50) default NULL,
  `USEMAIL` varchar(50) default NULL,
  PRIMARY KEY  (`USCOD`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='InnoDB free: 3072 kB';

-- ----------------------------
-- Records 
-- ----------------------------
INSERT INTO `tb_usuarios` VALUES ('well', '123', 'wellington marinheiro', 'wmarinheiro@hotmail.com');

public class Teste { 
	
public static void main(String[] args) throws Exception { 
		
	try 
	{ 
		String log = "login"; 
		String senha = "abc"; 
		String nome = "Rafael"; 
		String email = "Rafael@email.com.br";

		UsuarioDAO dao = new UsuarioDAO; 
		Usuario usuario = new Usuario(log,senha,nome,email);		
		dao.UsInserir(usuario);
		System.out.println("Registro inserido com sucesso!!!");
		} 
		catch(Exception e) 
		{    
			System.out.println("Não foi possivel, Erro: " + e.getMessage()); 
		} 
	} 
}