Hi All,
I am using Hibernate 2.1.7. I have lot of legacy data. So I cannot generate a new Id in each table. So I started using assigned generator class. I heard that there will be some problems with detached objects, if we use assigned generator class. Is there any solution to avoid this. Please help me to get out from this confusion.
Thanks,
Kumar.

Could you be more specific about the potential problem? Post a link or summarize the issue you heard of.

Offhand, I don't think assigned ids are the right way to go if you can't persist them. This would certainly lead to nasty detached issues, and tons of others.

Use composite-id to assemble an unique id from the persisted values of the row.

Hi!,
We are migrating our database from SQL Server to Oracle, meanwhile we decided to use hibernate. We cannot add extra id column to the database tables. We must use the existing primary-key as id in our case.

Hibernate supports assigned generator class to support this. But hibernate-reference.pdf document or hibernate in action book says if we use assigned generator we will be in troubles while working with detached objects/Trancient Persistence.

Is there any other generator class which will accomplish my requirement.
Thanks,
Kumar.

Ah, I didn't know you had a PK field! Good.

Again, I'm not sure the issue you are worried about, so if you could be more clear it would help. Perhaps it is this one (and the solution):

http://www.hibernate.org/116.html#A11