Action_Hook ein Buch mit 7 Siegeln?!?

function get_link_into_db($id) {
    global $wpdb, $post;


    $table_name = $wpdb->prefix . "verlinkung";
    $id = $post->ID;


    $spalte_leer = <<<SQL
        SELECT link_url FROM $table_name WHERE post_id = $id
SQL;


    $query = mysql_query($spalte_leer);
    while($row =mysql_fetch_array($query)) {
        $inhalt = $row["link_url"];
        $daten[] = $inhalt;
    }


    if ($daten == NULL) {


        $link_neu = <<<SQL
        INSERT INTO $table_name (post_id, link_url) VALUES ($id, 'neu')
SQL;


        $query2 = mysql_query($link_neu);
    }else {


        $link_update = <<<SQL
            UPDATE $table_name
            SET post_id = $id, link_url = 'erneuern'
SQL;


        $query3 = mysql_query($link_update);
    }
    return $id;
}
add_action('save_post', 'get_link_into_db', 1);
add_action('publish_post', 'get_link_into_db', 1);
add_action('edit_post', 'get_link_into_db', 1);