Database Db:：getInstance（）->；执行错误'；只能与select'一起使用；当我'；我正在做

我在尝试创建自定义sql时也遇到了同样的问题。我的Prestashop版本1.7.3.4

$sql_order_detail = 'SELECT `id_order_detail`, `product_id`, `product_quantity`, `unit_price_tax_incl` FROM '._DB_PREFIX_.'order_detail WHERE `id_order` = ' . $id_order;

$order_details = Db::getInstance()->ExecuteS($this->sql_order_detail, $array = true, $use_cache = 0);

我通过日志和phpMyAdmin测试sql：

SELECT `id_order_detail`, `product_id`, `product_quantity`, `unit_price_tax_incl` FROM ps_order_detail WHERE `id_order` = 24

错误是：

stderr: Db->executeS() must be used only with select, show, explain or describe queries,

使用以下方法解决： （神秘地）

$sql = new DbQuery();
$sql->select('*');
$sql->from('order_detail');
$sql->where('id_order = ' . $id_order);
$order_details = Db::getInstance()->executeS($sql);