Delphi can generate DLLs, which can be called from C, C++, Visual Basic, Powerbuilder, or anything else that understands standard Windows DLLs. There is an example of a database-capable DLL in the DEMOSDBDLL directory.

As is the case in all Windows programming languages that I know of, DLLs are difficult to debug and will crash your system if they aren't quite right. Save your source code frequently.