To generate user errors from procedures, you can use the SQLERROR variable to return an actual error string that caused the statement to fail to the calling application, as shown in Listing 16.

要从过程生成用户错误，可以使用SQLERROR变量检索一个实际的错误字符串，该错误字符串使语句无法作用于调用应用程序，如清单16所示。

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The line number displayed may not always be where the actual error originated.

错误消息中显示的行号不一定是出现错误的实际位置。

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This construct is used to return to the calling application the actual error that caused the statement to fail, as shown in Listing 17.

该结构用于将实际的错误返回给调用应用程序，这个错误致使语句执行失败，如清单17所示。

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She also said it would be too late to reverse course this year unless there was an actual error in the calculations.

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Another common example might involve an application for regulatory permission to market a new pharmaceutical, where there is an arguable error or even falsehood, but where the officer has no actual knowledge of the error or falsehood.

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Traders factored in a margin of error and when the actual numbers came out above the forecast numbers, stocks were sold.

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