Generic java class that will allow RPG/RPGSQLE program to access non-iSeries Data

Want to get an idea of how hard would be it to create a generic java
class that provide RPG/RPGSQLE program to access non-iSeries database.
 
My first though is having a java class with at least the following
methods:
- connectToDataBase(String Server, String DataBaseType, String
DataBaseName, String UserID, String Password)
- setResultSet(String sqlStatement)
- getNext()
- getColumn(int column)
- getColumn(String columnName)
- closeResultSet()
- closeConnection()
 
Main concerns:
- All above methods seems pretty straight forward, however, I'm not sure
how to handle to data that return by getColumn in RPG.