Question

im trying to update multiple records in my table so im wondering if there´s something wrong in this script as im only getting updated the last record.. this is the complete code http://pastie.org/5453954

 for ($i = 0; $i < count($_POST['id_servtype']); $i++){

    $servtype = $_POST['id_servtype'][$i];    
    $project = $_POST['id_project'][$i];
    $quantity = $_POST['tableQuantity'][$i];
    $pus = $_POST['tablePus'][$i];
    $puc = $_POST['tablePuc'][$i];
    $totalitem = $_POST['tableTotal'][$i];

    $sql = "update sales_order_items
    set
    id_project=?,
    id_service_type=?,
quantity=?,
    unit_price_no_tax=?,
    unit_price=?,
    total_item_imp=?
    where
    id_so=?
    and
    id_soitems=?
    ";

    $stmt = $this->dbh->prepare($sql);
    $stmt->bindValue(1, $project, PDO::PARAM_INT);
    $stmt->bindValue(2, $servtype, PDO::PARAM_INT);
    $stmt->bindValue(3, $quantity, PDO::PARAM_STR);
    $stmt->bindValue(4, $pus, PDO::PARAM_STR);
    $stmt->bindValue(5, $puc, PDO::PARAM_STR);
    $stmt->bindValue(6, $totalitem, PDO::PARAM_STR);
    $stmt->bindValue(7, $_POST["id"], PDO::PARAM_STR);
    $stmt->bindValue(8, $_POST["iditem"], PDO::PARAM_STR);
    $stmt->execute();

    }

    echo("Correct edition");

Answer 1

There is something wrong with your logic: the values used in your WHERE clause are always the same, so you’re always updating all records, each time using new values.
Logically, when your script has finished, only the last update will be visible, all previous updates have been overwritten. A simple example:

$newVals = array(1,2,3);
while($val = array_shift($newVals))
{
    $query = 'UPDATE myDB.tbl SET someField = :val WHERE id = 1';
    $stmt = $pdo->prepare($query);
    $stmt->execute(array('val' => $val));
}

Is the same as writing:

UPDATE myDB.tbl SET someField = 1 WHERE id = 1;
UPDATE myDB.tbl SET someField = 2 WHERE id = 1;
UPDATE myDB.tbl SET someField = 3 WHERE id = 1;

So the record(s) with id 1 are updated a total of three times, each time undoing the last update