Comments on: Bulk Data Operations With NHibernate’s Stateless Sessions http://davybrion.com/blog/2008/10/bulk-data-operations-with-nhibernates-stateless-sessions/ Trying to walk that thin line between intelligence and ignorance Wed, 17 Mar 2010 18:22:17 +0100 http://wordpress.org/?v=2.9.2 hourly 1 By: Robert http://davybrion.com/blog/2008/10/bulk-data-operations-with-nhibernates-stateless-sessions/comment-page-1/#comment-32310 Robert Tue, 16 Mar 2010 14:04:02 +0000 http://davybrion.com/blog/?p=543#comment-32310 Something I noticed when using the stateless session is that dependent objects get not cascade as they do using the "normal" session even though cascade="all" is set. To overcome this problem you need to loop through the dependent objects yourself, which is not a biggy. Just add the additional loops to your repository. This is from the documentation: "A stateless session does not implement a first-level cache nor interact with any second-level cache, nor does it implement transactional write-behind or automatic dirty checking, nor do operations cascade to associated instances. Collections are ignored by a stateless session. Operations performed via a stateless session bypass Hibernate's event model and interceptors. Stateless sessions are vulnerable to data aliasing effects, due to the lack of a first-level cache." Something I noticed when using the stateless session is that dependent objects get not cascade as they do using the “normal” session even though cascade=”all” is set. To overcome this problem you need to loop through the dependent objects yourself, which is not a biggy. Just add the additional loops to your repository.

This is from the documentation:
“A stateless session does not implement a first-level cache nor interact with any second-level cache, nor does it implement transactional write-behind or automatic dirty checking, nor do operations cascade to associated instances. Collections are ignored by a stateless session. Operations performed via a stateless session bypass Hibernate’s event model and interceptors. Stateless sessions are vulnerable to data aliasing effects, due to the lack of a first-level cache.”

]]> By: Davy Brion http://davybrion.com/blog/2008/10/bulk-data-operations-with-nhibernates-stateless-sessions/comment-page-1/#comment-4976 Davy Brion Sat, 15 Nov 2008 12:19:13 +0000 http://davybrion.com/blog/?p=543#comment-4976 @Andrzej I use NHibernate 2.0.x but i do use it on SQL Server... The last time i used it on Oracle was about a year ago, with NHibernate 1.2. But i actually think most of the batching functionality of NHibernate simply doesn't work with Oracle, not sure though... @Andrzej

I use NHibernate 2.0.x but i do use it on SQL Server… The last time i used it on Oracle was about a year ago, with NHibernate 1.2. But i actually think most of the batching functionality of NHibernate simply doesn’t work with Oracle, not sure though…

]]> By: Andrzej http://davybrion.com/blog/2008/10/bulk-data-operations-with-nhibernates-stateless-sessions/comment-page-1/#comment-4954 Andrzej Fri, 14 Nov 2008 16:59:54 +0000 http://davybrion.com/blog/?p=543#comment-4954 Hi Davy, I am investigating NH batch operations on Oracle and would like to speed it up compared to ODP.NET, but when I looked at NH 2.0 sources I seems like when stateless session is used, batching has no effect, inserts are still done one by one and in my case it performs just like normal session with no batching. Which NHibernate version did you use and which database you were working on? Regards, Andrzej Hi Davy,
I am investigating NH batch operations on Oracle and would like to speed it up compared to ODP.NET, but when I looked at NH 2.0 sources I seems like when stateless session is used, batching has no effect, inserts are still done one by one and in my case it performs just like normal session with no batching.
Which NHibernate version did you use and which database you were working on?
Regards,
Andrzej

]]> By: Reflective Perspective - Chris Alcock » The Morning Brew #213 http://davybrion.com/blog/2008/10/bulk-data-operations-with-nhibernates-stateless-sessions/comment-page-1/#comment-4453 Reflective Perspective - Chris Alcock » The Morning Brew #213 Fri, 31 Oct 2008 08:32:57 +0000 http://davybrion.com/blog/?p=543#comment-4453 [...] Bulk Data Operations With NHibernate’s Stateless Sessions - Davy Brion looks at how Stateless Sessions in NHibernate afford memory use benefits when performing bulk data operations. [...] [...] Bulk Data Operations With NHibernate’s Stateless Sessions – Davy Brion looks at how Stateless Sessions in NHibernate afford memory use benefits when performing bulk data operations. [...]

]]> By: Bulk Data Operations With NHibernate's Stateless Sessions - NHibernate blog - NHibernate Forge http://davybrion.com/blog/2008/10/bulk-data-operations-with-nhibernates-stateless-sessions/comment-page-1/#comment-4439 Bulk Data Operations With NHibernate's Stateless Sessions - NHibernate blog - NHibernate Forge Thu, 30 Oct 2008 19:32:21 +0000 http://davybrion.com/blog/?p=543#comment-4439 [...] Note: this was originally posted on my own blog [...] [...] Note: this was originally posted on my own blog [...]

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