comments rate system, help

I'm doing a rate comments system, and I don't know how to save the
dates in the data base. How you can see, I pass an id to the function,
which I realize to use to save on the table comments_rate

comments (id, comment)
comments_rate (id, comment_id, rate)

$html->link('comments_rate', array('controller' => 'comments',
'action' => 'rate_comment', 'id' => $comment_id));

function rate_comment(id) {
// CODE
}

thanks!!!

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