Hi, if i've created a system of objects and have mapped them to underneath database using hibernate, and afterwards i want to change the system design, what will happen to the old tables in the database? and if i want to migrate data from old database to the new orm, how do you suppose to do that?

thanks

unless you are generating you database schema in unison w/ your object model, the data model and object model will be out of sync after you make these changes. you may want to check out the hbm2ddl feature in the documentation on how you can aviod this problem.