In the project list of the Berkeley_DB.sln
             solution, build the "db_stl" project and
            "db_stl_static" project to build STL API as a dynamic or
            static library respectively. And in your application, you
            should link this library file as well as the Berkeley DB
            library file to your application. The STL API library file
            is by default always put at the same location as the
            Berkeley DB library file. 
        
And you need to include the STL API header files in your application code. If you are using the Berkeley DB source tree, the header files are in <Berkeley DB Source Root >/stl directory; If you are using the pre-built installed version, these header files are in < Berkeley DB Installed Directory>/include, as well as the db.h and db_cxx.h header files.