You are kinda confusing here. So, what is your problem - you can't make your WoW WoD server emulator run, or an actual MySQL server? These are 2 completely different things.
For MySQL just Google.:
https://stackoverflow.com/questions/12972434/restart-mysql-server-on-windows-7And if you continue having issues with MySQL, I'd suggest you to reinstall it and follow MySQL installation guide very, very closely. If you are using TrinityCore, such guide is here:
https://trinitycore.atlassian.net/wiki/display/tc/Windows+Requirements (point 3)
BUT if starting an actual WoW server is what you are having issues with - there is nothing like restarting a server, at least not on WotLK, and I doubt something has changed. Whenever server is being restarted, it is actually completely closed (stopped) and then either you or some external script (usually called restarter) have to start server again. So there is no actual restart, only re-start. And, like I said, MySQL server and WoW server are two completely separated and different applications and things. Running MySQL server means you are running application which is responsible for inserting, editing, removing and retrieving data from database. Thats not WoW server.