How to update a database with PDO?

Question

I do a print_r($params); and every value comes through. For some reason it isn't updating the database.

Select statements work with my other PDO statements and I can update items with mysql, but am upgrading those to PDO (such as this statement).

Is there anything wrong with my syntax?

$getData        =       new Data();
$gptest         =       $getData    ->  insert_group_id($item_id, $id, $gp, $groupid, $type);

Data() class includes these:

function insert_group_id($item_id, $id, $gp, $groupid, $type) {

 $params = array(
        'item_id' => $item_id,
        'id' => $id,
        'gp' => $gp,
        'group_id' => $groupid,
        'type' => $type
    );

   $qry = "UPDATE actions_item
            SET gp = :gp ,
                group_id = :group_id ,
                type = :type
            WHERE itemID = :item_id
            AND itemVID = :id
            ";

    return $this->update($qry, $params);        
}

protected function update($sql, $params)
{
    $stmt = $this->dbh->prepare($sql);
    return $stmt->execute($params);
}

Answer 1

Your array keys need to have the same format as the placeholders.

$params = array(
        ':item_id' => $item_id,
        ':id' => $id,
        ':gp' => $gp,
        ':group_id' => $groupid,
        ':type' => $type
    );

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Based on what I learned instantly after writing this, the colons shouldn't be required. I set up a table with all your same column names and your exact code worked for me without them. So, I'm really not sure why this seemed to solve the problem.