Hi Pesho,
PeshoChuka wrote:
Hello I have an e-commerce application. And I am using JSF and stateless
EJB's.
In a session managed bean I am storing the User object who is dosconnected.
At certain point the user wants to change its account. I am updateing the
users Account. At tis point I want to synchronize the disconected User
object to the database.
problems:
1. I cannot use refresh because the entity is disconnected.
2. I cannot use merge because old data will apply upon the new data and the
changes that were made will be rollbacked.
Merge is the usual way to synchronize disconnected instances. On merge,
the changes in the disconnected instance will be applied to a managed
copy, and this copy is saved to the database on transaction commit.
Isn't that what you want? Only refresh overwrites local changes with the
state for the database.
3. If i use entity.find(id) wouldn't it be too expensive operation?
How to refresh the state of a disconnected entity? Thanks in atdvance.
And I have one more question. Lets suppose that I have customer entity and
this entity has relation with Accounts with fetch type set to LAZY. If at
certain moment I need to fetch this records and the User Entity is
disconnected what is the best way to achieve this?
This relationship should be marked EAGER, if it's going to be used in
the disconnected instance.
-- markus.
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