How to insert javascript safely into database and take them back as it is?

[admin]

I'm making a WordPress Advertisement Management Plugin. Need the user to enter Google AdSense and other ad code into the database.

I checked the other solution like the

mysql_real_escape_string()

and

base64_encode()

&

base64_decode()

. But they are not doing the desired result.

I'm using a simple form like <a href="https://wordpress.stackexchange.com/a/108351/22728">this</a>:

<form action="" enctype="multipart/form-data" method="post">
    <textarea name="ad_code"></textarea>
    <input type="submit">
</form>

To insert into the db:

<?php
        if (!empty($_POST)) {
        global $wpdb;
            $table = $wpdb->my_table = $wpdb->prefix . "my_table";
            $data = array(
                'ad_code'    => $_POST['ad_code']
            );
            $format = array(
                '%s'
            );
            $success=$wpdb->insert( $table, $data, $format );
            if($success) echo 'data saved';
        }
?>

With the aforementioned code, I tried with:

$data = array(
    'ad_code'    => mysql_real_escape_string( $_POST['ad_code'] )
);

and

$data = array(
    'ad_code'    => base64_encode( mysql_real_escape_string( $_POST['ad_code'] ) )
);

and

$data = array(
    'ad_code'    => base64_encode( $_POST['ad_code'] )
);

The first two attempt completely failed me. But using only the

base64_encode()

is doing a good job encoding the texts into code and inserting into the db, but when I'm trying with

<?php echo "<pre>" . base64_decode( $the_ad_query->ad_code ) . "</pre>"; ?>

in my db query, it's not showing anything.

Instead of JavaScript, I tried with simple string like "This is the code", it's doing just fine. But I failed with JavaScript code.

My google adsense code is like this:

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<!-- my ad -->
<ins class="adsbygoogle"
     style="display:inline-block;width:728px;height:90px"
     data-ad-client="ca-pub-32131313131312317"
     data-ad-slot="8657754785"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

How can I proceed then? Any ideas?