Updating with $qpdb->query() always returns 0 rows affected

wpdb uses PHP’s mysqli_affected_rows() or mysql_affected_rows(), which can be disabled via an argument in php.ini. I am guessing that that is what has happened. Check the disabled_functions line in your php.ini file and remove the references to those function.

Of the top of my head, I am not sure if extensions like Suhosin mess with that function but that is certainly possible.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)