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。

youdao

So-called empty sign means the symbol with the form of blank, partition, pause and distance etc. functioning as a special sign that can't be acted for in various sign systems.

所谓空符号，是指以空白、间隔、停顿、距离等作为符号形式，在各种符号系统中起着不可替代作用的一类特殊符号。

youdao

You cannot apply drop cap formatting to an empty paragraph. You must first type at least one letter, number, or symbol.

空段落不能应用首字下沉格式，您必须先至少键入一个字母、数字或符号。

youdao

Most stations still have plastic bags wrapped around their nozzles, now the universal symbol for empty in this city.

NPR: Gas Shortages Stalled Houston Evacuation

"Allowing this armory to remain empty and stand as a symbol of the abandonment that once plagued the Bronx was simply unthinkable, " Bloomberg said as he stood in the chilly, vaulted, four-acre-plus expanse that was the armory's drill floor.

WSJ: Celebs join project for giant NYC skating center

In the meantime, empty frames hang on the walls of the museum, a reminder of the "enormous loss" and a symbol of hope that they will be recovered, said Ortiz.

NPR: FBI Focuses On Recovering Art Stolen In Mass.