error LNK2019: unresolved external symbol "class sql::mysql::MySQL_Driver * __cdecl sql::mysql::get_driver_instance(void)" (?get_driver_instance@mysql@sql@@YAPAVMySQL_Driver@12@XZ) referenced in function "private: void __thiscall Database_NS::Manager::initialize_db_driver(void)const " (?initialize_db_driver@Manager@Database_NS@@ABEXXZ)

sql::Driver * p_driver = sql::mysql::get_driver_instance();

CPPCONN_PUBLIC_FUNC MySQL_Driver * get_driver_instance();

*sampletest.obj : error LNK2001: unresolved external symbol __imp__get_driver_instance*