PDO插入查询不会在我的数据库中插入数据

Question

我需要在我的数据库中插入评级，所以我尝试使用此链接集：

<?php foreach (range(1, 5) as $ocena) { ?>
<a href="ocena.php?clanak=<?php echo $clanci['id'];?>&ocena=<?php echo      $ocena; ?>"><?php echo $ocena; ?></a>
<?php } ?>

And in my ocena.php i have $_get method to retrive values and store it in database:

<?php

include_once 'includes/konekcija.php';

if (isset($_GET['clanak'], $_GET['ocena'])) {
    $clanak = $_GET['clanak'];
    $ocena = $_GET['ocena'];

    if (in_array($ocena, [1,2,3,4,5])) {
         $niz = $pdo->prepare("SELECT id FROM clanci WHERE id =:id");
         $niz->bindParam(":id", $clanak);
         $niz->execute();
         $red = $niz->fetch();

        if ($red) {
            $upit = $pdo->prepare("INSERT INTO ocene (clanak, ocena) VALUES (?, ?)");
            $upit->bindValue(1, $clanak);
            $upit->bindValue(2, $ocene);
            $upit->execute();

            header('Location: clanak.php?id=' .$clanak);
        } else {
            echo 'Nesto nije u redu.';
        }
    }
}

所以它重新定位，一切似乎都很好，但当我检查我的数据库时，结果现在已插入。我没看到什么？