Say, I have an article page (`example.com/article.php?id=1`) that contains news, I want to add this page's data (my data name in the database is `pagehit`). So for every unique IP address that visit this page, the `pagehit` in the database is added by 1.

So far, I've known that using K, we can get the ip address of the client. But how to check that for each unique ip, the `pagehit` in the database can be added?