Syntax in function does not work

I don`t have problem with query. It works me.
I have a problem with query in FUNCTION().

function test() {
$query = $this->db->query("YOUR QUERY");

if ($query->num_rows() > 0)
{
$row = $query->row();

echo $row->title;
echo $row->name;
echo $row->body;
}

}

The query without function() works.