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.
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.
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.
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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