public function build_director() { $sql_builder = new SQLBuilder(); $data = $this->get_data(); $input = SQLLexical::make_product_list($data['list_product']); return $sql_builder->sql_insert('tam_an.product', array('Name', 'Bought', 'Price', 'Unit'))->sql_insert_values_recursive($input)->end_query()->to_string(); }