The formats supplied here are only available for certain database fields, such as numerical or Boolean fields. If you select a database field in text format, you will not be able to select any format from the selection list, since the text format will be automatically maintained.
此处提供的格式仅适用于特定数据库字段，例如数字或布尔字段。如果选©文本格式的数据库­段，将无法从选择列表中选择任何格式，因为将自动维持文本格式。