Router

Thanks guys for halp, but i will stay at CI 2.1
There one more error.
Don't work this SQL request in CI 3.1.!?

PHP Code:

$sql = "select * from (select * from net_euro where begin_ip<=$int order by begin_ip desc limit 1) as t where end_ip>=$int";
$result = mysql_query($sql); 


Variable "$result" is empty.
Perhaps this is not the end.