在实际的应用程序中，此操作应支持更复杂的修改，其中包括添加或删除订单中的订单行。

In a real-world application this operation would support more complex modifications, including addition and deletion of order lines in the order.

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该示例应用程序允许您创建、更新和删除客户并检索订单。

This sample application lets you create, update, and delete customers and retrieve orders.

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在这个业务示例中，只要存在相关的订单，就不允许删除客户。

In this example business case, it is not allowed to delete a customer as long as associated orders exist.

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