Data loading

[[EMAIL PROTECTED]]

I should load a dataTable component.
The property name is corporate.members. 
This list must be created with database datas.
My idea is write a fetchMembers bean method.
The categoryId is an face page parameter

members.faces?categoryId=123 

How must I resolve this parameter in then bean method?

private List fetchMembers() {

    How to do????? 
    ???? Resolve the categoryId paramter

      query datas ....
}

Are are there any more elegant solutions?