Example of Operating SQL Server database in C ++

C ++ can import msado15.dll to operate SQL Server or access database. msado15.tlh and mmsado15.tli files are generated based on the parameters during import, these two files encapsulate the COM component class in msado15.dll in smart pointer.

For how tlh and TLI encapsulate COM component classes as C ++ classes, Let me give an example of the connection class in ADO.
There is a COM component class in msado15.dll: Struct _ Declspec (UUID ( " 00000550-0000-0010-8000-00aa006d2ea4 " ))
_ Connection: connection15
{
//
// Wrapper methods for error-handling
//

Hresult cancel ();

//
// Raw methods provided by Interface
//

Virtual Hresult _ stdcall raw_cancel () =   0 ;
} ;

The