public function add($conditions = [], $values = [], $types = [])
    {
        if (!is_array($conditions)) {
            $conditions = [$conditions];
        }
        if (!is_array($values)) {
            $values = [$values];
        }
        if (!is_array($types)) {
            $types = [$types];
        }

        $this->_addExpressions($conditions, $values, $types);

        return $this;
    }