I woud like Appian RPA Robot to read/write to DB in "MS Access".

Dear

I would like Appian RPA Robot to read/write to DB in "MS Access".
So, I am trying to create custom Java code.

Issues Below are wexing me now.
1. How to pass values from process model to custom Java code.
2. How to execute the query statement against MS Access.
3. How to return query execution results from java custom code to process model

Regarding 2, I think I will use UCanAccess which is one of JDBC.
If you know a better way, could you tell me it.

Regarding 1 and 3, could you share a sample code ?