Adding method to a MySql database

Attention Newbie question.

I am currently looking to EEDesktop application sample + video training.
I am running a MySql database.

I see in EEDesktop + video that it’s possible to directly “attach” some methods to the Database in the programming environment (IDE?)

But I can’t succeed to do this in my current project. I see nowhere the possibility to add / attach methods to my database.

How can I do this?

Thanks for your help.