Почему не работает PDO?

$char = $page->for;

foreach( $_POST as $key => $value ){
  $value = str_replace("'", "\'", $value);
  $connect->query("UPDATE `keys` SET `value` = '$value' WHERE `name` = '$key' AND `for` = '$char'");
}

$char = $page->for;

    $query = $connect->prepare("UPDATE keys SET value = :v WHERE name = :n AND for = :c");
    $query->bindParam(':c', $char);

    foreach( $_POST as $key => $value ){
      $query->bindParam(':v', $value);
      $query->bindParam(':n', $key);
      $query->execute();

    }