Order by multiple columns with Doctrine
===

I need to order data by two columns (when the rows have different values for column number 1, order by it; otherwise, order by column number 2)

I'm using a QueryBuilder to create the query.

If I call the orderBy method a second time, it replaces any previously specified orderings.

I can pass two columns as the first parameter
    ->orderBy('r.firstColumn, r.secondColumn', 'DESC');
but I cannot pass two ordering directions for the second parameter, so when I execute this query the first column is ordered in an ascending direction and the second one, descending. I would like to use descending for both of them.

Is there a way to do this using QueryBuilder? Do I need to use DQL?