public function page(/*# int */ $pageNumber, /*# int */ $perPage = 30)
    {
        $this->clause_limit = [(int) $perPage, ($pageNumber - 1) * $perPage];
        return $this;
    }
public function page(/*# int */ $pageNumber, /*# int */ $perPage = 30)
    {
        $this->clause_limit = [(int) $perPage, ($pageNumber - 1) * $perPage];
        return $this;
    }
{@inheritDoc}