@Lenim где вы нашли такое?
Конкретный путь вхождение к контроллеру можете сказать catalog/controller/*.*
(И версию движка указать) Немогу найти на - https://github.com/opencart/opencart/find/master
Похожую строку нашел в catalog/model/checkout/order.php
но чучуть другая, строка 4:
this->db->query("INSERT INTO `" . DB_PREFIX . "order` SET invoice_prefix = '" . $this->db->escape($data['invoice_prefix']) . "', store_id = '" . (int)$data['store_id'] . "', store_name = '" . $this->db->escape($data['store_name']) . "', store_url = '" . $this->db->escape($data['store_url']) . "', customer_id = '" . (int)$data['customer_id'] . "', customer_group_id = '" . (int)$data['customer_group_id'] . "', firstname = '" . $this->db->escape($data['firstname']) . "', lastname = '" . $this->db->escape($data['lastname']) . "', email = '" . $this->db->escape($data['email']) . "', telephone = '" . $this->db->escape($data['telephone']) . "', fax = '" . $this->db->escape($data['fax']) . "', custom_field = '" . $this->db->escape(isset($data['custom_field']) ? json_encode($data['custom_field']) : '') . "', payment_firstname = '" . $this->db->escape($data['payment_firstname']) . "', payment_lastname = '" . $this->db->escape($data['payment_lastname']) . "', payment_company = '" . $this->db->escape($data['payment_company']) . "', payment_address_1 = '" . $this->db->escape($data['payment_address_1']) . "', payment_address_2 = '" . $this->db->escape($data['payment_address_2']) . "', payment_city = '" . $this->db->escape($data['payment_city']) . "', payment_postcode = '" . $this->db->escape($data['payment_postcode']) . "', payment_country = '" . $this->db->escape($data['payment_country']) . "', payment_country_id = '" . (int)$data['payment_country_id'] . "', payment_zone = '" . $this->db->escape($data['payment_zone']) . "', payment_zone_id = '" . (int)$data['payment_zone_id'] . "', payment_address_format = '" . $this->db->escape($data['payment_address_format']) . "', payment_custom_field = '" . $this->db->escape(isset($data['payment_custom_field']) ? json_encode($data['payment_custom_field']) : '') . "', payment_method = '" . $this->db->escape($data['payment_method']) . "', payment_code = '" . $this->db->escape($data['payment_code']) . "', shipping_firstname = '" . $this->db->escape($data['shipping_firstname']) . "', shipping_lastname = '" . $this->db->escape($data['shipping_lastname']) . "', shipping_company = '" . $this->db->escape($data['shipping_company']) . "', shipping_address_1 = '" . $this->db->escape($data['shipping_address_1']) . "', shipping_address_2 = '" . $this->db->escape($data['shipping_address_2']) . "', shipping_city = '" . $this->db->escape($data['shipping_city']) . "', shipping_postcode = '" . $this->db->escape($data['shipping_postcode']) . "', shipping_country = '" . $this->db->escape($data['shipping_country']) . "', shipping_country_id = '" . (int)$data['shipping_country_id'] . "', shipping_zone = '" . $this->db->escape($data['shipping_zone']) . "', shipping_zone_id = '" . (int)$data['shipping_zone_id'] . "', shipping_address_format = '" . $this->db->escape($data['shipping_address_format']) . "', shipping_custom_field = '" . $this->db->escape(isset($data['shipping_custom_field']) ? json_encode($data['shipping_custom_field']) : '') . "', shipping_method = '" . $this->db->escape($data['shipping_method']) . "', shipping_code = '" . $this->db->escape($data['shipping_code']) . "', comment = '" . $this->db->escape($data['comment']) . "', total = '" . (float)$data['total'] . "', affiliate_id = '" . (int)$data['affiliate_id'] . "', commission = '" . (float)$data['commission'] . "', marketing_id = '" . (int)$data['marketing_id'] . "', tracking = '" . $this->db->escape($data['tracking']) . "', language_id = '" . (int)$data['language_id'] . "', currency_id = '" . (int)$data['currency_id'] . "', currency_code = '" . $this->db->escape($data['currency_code']) . "', currency_value = '" . (float)$data['currency_value'] . "', ip = '" . $this->db->escape($data['ip']) . "', forwarded_ip = '" . $this->db->escape($data['forwarded_ip']) . "', user_agent = '" . $this->db->escape($data['user_agent']) . "', accept_language = '" . $this->db->escape($data['accept_language']) . "', date_added = NOW(), date_modified = NOW()");
Судя по вашей логике запросов нужно смотреть если ли переменная total тогда для нее будет запрос типа:
total = '" . $this->db->escape($this->request->post['total']) . "',