In the second variation, writing a row means modifying an existing row.

在第二个变体中，写一行意味着修改一个现有的行。

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An error occurs if you try to add a new row with a key value that matches an existing row.

如果您尝试添加具有与现有行匹配的键值的新行，则会出现错误。

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Or you can modify an existing row that had been read previously from the database, as in Listing 6.

或者，您可以修改一个以前曾经从数据库中读取的一个现有的行，如清单 6 所示。

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VOA: standard.2010.03.02

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