Hibernate overriding database modifications with detached object state
- by EugeneP
I'm gonna go with this design:
create an object and keep it alive during all web-app session.
And I need to synchronize its state with database state.
What I want to achieve is that :
IF between my db operations, that is, modifications that I persist to a db
someone intentionally spoils table rows, then on next saving to a database
all those changes WOULD BE OVERWRITTEN with the object state, that always contains valid data.
What Hibernate methods do you recommend me to use to persist the modifications in a database?
saveOrUpdate() is a possible solution, but maybe there's anything better?
Again, I repeat how it looks. First I create an object without collections. Persist it (save()).
Then user provides us with additional data. In a serviceLayer, again, we modify our object in memory (say, populate it with collections) and then, persist it again.
So every serviceLayer operation of the next step must simply guarantee that database contains the exact persistent copy of this object that we have in memory. If data in a database differ, it MUST BE OVERRIDDEN with the object (kept in memory) state.
What Session operations do you recommend?
