You need to check the arguments before proceeding with the logic of each method.

你需要在继续进行每一个程序的逻辑之前检查实参。

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So the procedure processing the logic has an outermost check that will decide whether the rest of the body will execute or the procedure returns with no action taken.

因此，处理该逻辑的过程有一个最外层的检查，决定是执行主体的其余部分，还是不采取任何动作而返回。

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Note: The remote statement has some additional logic that is used internally to check for empty result sets.

注：远程语句在内部使用一些附加逻辑来检查空结果集。

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