Need help whit ban system

Hello guys, i want to ask help from you. I want to change mine code from banip to banmac.

Can please help me, here is full code.

banmanager.java

https://pastebin.com/72TUBCyA

adminban.java

https://pastebin.com/5j4TX4Gc

player.java

https://pastebin.com/xCwU6C0i

enterworld.java

https://pastebin.com/xhfqHbsD

banned.sql

https://pastebin.com/6XpDc1VU

I found this code but, i don't understand how to adapt in my custom ban system... please help me

https://pastebin.com/zmziwgM5