Grazie Ho letto e provato e funziona ho fatto cosi le critiche sono bene accette
codice:
<?php

$cn = new COM("ADODB.Connection") or die("Cannot start ADO");
$cn->Open("Provider=Microsoft.Jet.OLEDB.4.0;User ID=Admin;Jet OLEDB:Database Password=gmpa;Data Source=C:\Users\Paolo\Dropbox\Programmazione\c#\dati.mdb;");
$response = array();
// =  mysql_query( "SELECT * FROM  TempMAGXLS")or die(mysql_error());
$query= ("SELECT * FROM  TempMAGXLS ");
$result = $cn->Execute($query);
 // check for empty result
 
if (!$result->EOF) {
    // looping through all results
    // products node
    $response["products"] = array();
 
    while (!$result->EOF) {
        // temp user array
        $product = array();
        $product["Codice"] =  $result ->Fields[0]->value;
        $product["Descrizione"] =  $result ->Fields[1]->value;
        $product["PrezzoCo"] =  $result ->Fields[5]->value;
        $product["PrezzoPu"] =  $result ->Fields[6]->value;
        $result ->MoveNext();
        // push single product into final response array
        array_push($response["products"], $product);
    }
    // success
    $response["success"] = 1;
 
    // echoing JSON response
    echo json_encode($response);
} else {
    // no products found
    $response["success"] = 0;
    $response["message"] = "No products found";
 
    // echo no users JSON
    echo json_encode($response);
}


?>