Doubt regarding Transaction in Entities

[Jothi Shankar Kumar]

Guys,

There is a method called contains() that we can invoke on an Entity to check if that entity is available in the PersistenceContext. Likewise is there any way to attach an entity to a PersistenceContext apart from operating it using the entity operations like find() and getReference()?

[Mihai Radulescu]

Hi Jothi

The merge method is used (also) to attach an entity to context.
I think the answer to your question is no, there is nothing like attach method - there are a lot of tricks bue each one has pros and contras.

Regards
Mihai

[Minu Jain]

There are 3 methods mainly that attach an entity(when an entity becomes managed).
persist()
find()
merge()

Hope this helps answer your query!

[Mihai Radulescu]

Hi Minu,

Dont forget the createQuery():Query from the EntityManager. If is trigger isn a transaction then the entities resulted are attached to the corresponding persistnce context.

Regards,
Mihai