Hi,

I am developing an application server that needs a complex Storage Model. I need In memory database, persistence operations and interaction with in memory db and persistence db.

Requirements:
Some Data will be in memory getting from DB, but read only
Some Data will be in memory getting from DB, write-read support to db
Some Data will be in memory but not in DB (no equivalent in db ,if one mapping, no update to db(flush not active this table))

How can i design this model, using second level cache(jboss cache or ehcache)?
All of them possible?


thanks,
Serdar

2 is default behaviour of hibernate.
1 is also seems possible using table by table mapping configuration
what about 3?

Can you give some more detail on what exactly the third requirement entails? It sounds like you want to have virtual/computed columns (e.g. formulas) or that you want to tie in data from other sources. Please elaborate.

Thanks,

-Kaare