Applejack is an old 'CityRP' gamemode, based on Cider that was made by kurozael and edited by Lexi.
If you're wanting to start a 'CityRP' server, you probably should just make your own gamemode instead of editing a 7 year old gamemode.
This gamemode is using FPTje's MySQLite module, so you can just install the gamemode like normal & use it, if you want to use MySQL edit sv_config.lua, I have made it alot easier for you to use this gamemode because it was already too hard!
I'll support this gamemode for a little while, add me on steam for help; http://steamcommunity.com/id/Pawsativehi
FPTje - His MySQLite module
kurozael (Conna) - Made the core systems of Cider, populated it with items and released it.
Lexi - Vast swathes of improvements to the script, going with the philosophy that "Light RP doesn't have to be shit."
Pawsative - Conversion of the gamemode
rayts - Conversion of the gamemode
Int64 - Conversion of the gamemode