Update sqlmodel.cpp

[soyoo]

change private parameters initial sequence.

[HamedMasafi]

LGTM, btw. @HamedMasafi are you up to use the C++11 features? Like member initialisation in headers (what I would prefer because I think it results cleaner code)?

Hi @martonmiklos Yes, in my opinion, c++11 can be considered as a base standard for the project