public static ArrayList<Clientes> sqlSelectTodos()
    {
        ArrayList<Clientes> cat = new ArrayList();
        if(!BD.getInstance().sqlSelect("SELECT * FROM clientes ORDER BY idclientes DESC")){
            return cat;
        }        
        while(BD.getInstance().sqlFetch()){
            cat.add(new Clientes(BD.getInstance().getInt("rut")
                                        ,BD.getInstance().getString("dv").charAt(0)
                                        ,BD.getInstance().getString("nombre")
                                        ,BD.getInstance().getString("ape_paterno")
                                        ,BD.getInstance().getString("ape_materno")
                                        ,BD.getInstance().getString("email")
                                        ,BD.getInstance().getString("fecha_nac")
                                        ,BD.getInstance().getString("telefono")
                                        ,BD.getInstance().getString("sexo").charAt(0)
                                        ,BD.getInstance().getString("direccion")                  
                    
                    ));
        }
        return cat;
    }