注意，Payvment API 根据添加商品到购物车时提供的信息自动计算商品小计和购物车总量。

Notice that the Payvment API automatically calculates item subtotals and the cart total, based on the information provided when adding each item to the cart.

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这样导致一种双重方法：您拥有供人类使用的网页，并且拥有一个计算机可以获取结构化信息以便进行自动处理的 API。

This leads to a dual approach: You have Web pages for human consumption and you have an API where computers can pull out structured information for automatic processing.

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数据库服务器自动发出UPDATE STATISTICS语句，为引用该表的所有SPL例程重新计算例程统计信息。

The database server automatically issues the UPDATE statistics statement to recalculate routine statistics for all SPL routines that reference the table.

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