您好，我正在使用 Firebird (2.5) 作为数据库与 Firedac (Delphi Seattle) 合作，当我使用 TFDQuery 运行此查询时，没有返回任何记录：
SELECT ID FROM USERS WHERE PWD = 'êHÆ–!+'
数据库程序中与 IbExpert 相同的查询返回一条记录。 Firedac 组件是否有一些参数可以配置来解决这个问题。谢谢。
It's in the query string and it's the ! char. By default, query strings are preprocessed, and you must escape constant chars like !, &, :, ?, { or }, otherwise they are used as special chars.
Your best option is using parameters. That will (except other benefits) get rid of that ! char from the preprocessed command:
FDQuery.SQL.Text := 'SELECT ID FROM USERS WHERE PWD = :Password';
FDQuery.ParamByName('Password').AsString := 'êHÆ–!+';
FDQuery.Open;
另一种选择是转义常量字符或禁用宏预处理器。欲了解更多信息，请参阅特殊字符处理 http://docwiki.embarcadero.com/RADStudio/en/Preprocessing_Command_Text_(FireDAC)#Special_Character_Processing topic.
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