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。
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。
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。
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。
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