Server-side validation in c++ [on hold]

How can I use c++ in server-side form validation? Is it faster then PHP or c# in server side? How can I connect with mongo db in c++? Must I use OOP C++? I have tried nothing,because I don't know anything about it.I have searched for this but can't find anything. I only Know Connection library to MySQL db--

#include "mysql_connection.h"