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 Post subject: Oracle sequence value - remove SELECT sequence.NEXTVAL
PostPosted: Fri Jun 10, 2016 5:13 am 
Newbie

Joined: Fri Jun 10, 2016 4:41 am
Posts: 1
Hello,
Is there an option to remove "SELECT sequence.NEXTVAL FROM dual" everytime we need a value from an Oracle sequence?
I thought something like "insert into test (id,b,c) values (test_seq.nextval,:1,:2)".
Thank you,
Radovan


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 Post subject: Re: Oracle sequence value - remove SELECT sequence.NEXTVAL
PostPosted: Fri Jun 10, 2016 6:08 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1630
Location: Romania
The id must be generated prior to the insert statement because of the write-behind transactional cache. Behind the scenes, Hibernate uses a Map-like structure to cache all managed entities in what's commonly called the 1st-level cache. The cache key is formed of the Entity class and the Entity identifier, hence the identifier must be known when the entity becomes managed.

Also worth mentioning that when you persist an entity, the insert statement is not generated right away. The insert statement is delayed until a flush occurs.

If you want to optimize the number of sequence calls, you should use the pooled optimizer.


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