[SOLVED]How to make a conditional insert in multiple tables?

[eluser]earlyriser[/eluser]
[quote author="Sumon" date="1223003201"]what about

Code:

echo $query->num_rows();

[/quote]

I did it. I got a blank page

My current code is

Code:

function comment_insert()
    {
        //check if the wine is in database
        $thename=$_POST['name'];
        $this->db->select('*');
        $this->db->from('wines');
        $this->db->where('name', $thename);
        $data['query']= $this->db->get();
        echo $query->num_rows();
    }

and still is a blank page, I'm not sure if the query is correct.
Thanks for your comments.