因为采购订单不包含详细产品信息，所以需要进行单独查询，以便从产品表中查找产品详细信息。

Since the purchase order contains no detailed product information, a separate query is needed to find the product details from the product table.

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用于创建采购订单的XML代码和关系代码大部分都相同，惟一的差别是用于查找产品当前价格的查询。

The XML code and the relational code to create the purchase order are mostly identical, with the only difference being the query to find the current price of the product.

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在关系版本中，必须执行一个查询来获取每个采购订单中产品的列表。

In the relational version, we must execute one query to get a list of products in each purchase order.

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