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Doubt regarding Transaction in Entities
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Joe Harry
Ranch Hand
Joined: Sep 26, 2006
Posts: 8457
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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()?
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SCJP 1.4, SCWCD 1.4 - Hints for you, SCBCD Hints - Demnachst, SCDJWS - Auch Demnachst
Did a rm -R / to find out that I lost my entire Linux installation!
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Mihai Radulescu
Ranch Hand
Joined: Sep 18, 2003
Posts: 912
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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
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SCJP, SCJD, SCWCD
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Minu Jain
Ranch Hand
Joined: Mar 24, 2008
Posts: 74
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There are 3 methods mainly that attach an entity(when an entity becomes managed).
persist()
find()
merge()
Hope this helps answer your query!
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SCBCD5, SCWCD5, SCJP5
"Even if you're on the right track, you'll get run over if you just sit there."
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Mihai Radulescu
Ranch Hand
Joined: Sep 18, 2003
Posts: 912
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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
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subject: Doubt regarding Transaction in Entities
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