i have a bunch of different objects, all of them auto-generated from an xml-scheme. to give you an example:
i need to get those objects persistent into the database. even though i want to use an ORM tool, prefarable iBATIS, the data needs to be relational accessible via pure SQL. this lead to a data-base design like this:
(without this requirement, the schema would be pretty much the same i guess ;-) )
and here is my problem:
as i dont have influence on the classes i need to persist, they don't have id values. as already mentioned, they are JAXB-generated from an xml scheme. but for persistence with 1:1 and 1:n relations, unique persistant ids are an absolute must.
every single ORM example i find in the web comes with it's objects having id fields, making them perfectly identifiable.
so, where do i get my id's from?
i don't consider this an ORM question, pls dont move. i'd rather put my question like this - what would be the best aproach to get the id to the objects?
(1) changing the classes hm, i have hundreds of those
(2) wrapping it somehow how would "somehow" work with so many different classes? effectiveness and performance is a must. am i blind or is the solution non-trivial?
(3) influence on jaxb to generate id's i'll investigate in this direction
any ideas welcomed!
many thanks, jan
Joined: Feb 03, 2004
... i solved the problem with extending all schema-derived classes from one common superclass which provides ids ...