[odb-users] How to use wstring instead of string？

[Justlive]

Hi there,
    in my .h file, I define a class member of type is std::wstring. 
   then generate code, it show errors: 
error: unable to map C++ type '::std::wstring' used in data member 'Report_Id' to a database type
   how can I do ?
   thx very much.