invalid use of external symbol 使用了无效的外部符号
Convert the database's result for an invalid symbol, such as an empty query result, into the error the service expects.
将数据库针对无效代码的输入结果(如空查询结果)转换为服务希望的错误。
If one is not seen, the dummy value of -999.99F is sent back to the method consumer, which interprets the dummy value as a call for an invalid stock symbol.
如果没有发现一个输出，则将 dummy 值 -999.99F 返回给方法使用方，将 dummy 值解释为对无效股票代码的调用。
Similar to a synchronous invocation, InvalidSymbolException indicates that the request has reached the service provider, which has thrown a business exception stating that the symbol is invalid.
与同步调用类似，InvalidSymbolException 指示 请求已到达服务提供程序，该提供程序抛出业务异常，指示符号无效。
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