Your code does not match the examples you've linked to. E.g. the examples say sql::Driver *driver;, but your code says sql::mysql::MySQL_Driver *driver;. The examples say driver = get_driver_instance();, but your code says driver = sql::mysql::get_mysql_driver_instance();.
unresolved external symbol 'symbol' referenced in function 'function'
I say this as someone for whom English is a second language: if you can read English I strongly recommend that you configure your compiler to output error messages in English. It will make searching information on the Internet a lot easier for you.
Anyway, the error means that you need to link to the mysql library. Somewhere in the documentation should explain how to do that, but basically you should have gotten with your download a .lib file that you should add to your project's linker options.
Thank you very much Helios,
Correct, I translated in from another language.
Ok, I will try to link it again, seems that for some reason it doesn't work appropriate, because I already connected it.