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Rolf.Knoll
 Post subject: object retrieval and transactions
PostPosted: Tue Feb 15, 2005 7:06 am 
Newbie

Joined: Tue Feb 15, 2005 6:54 am
Posts: 3
Hi,
I have started to do an evaluation o Hibernate.
Now I am wondering whether it is really necessary to start a transaction before retrieving objects by sesion.get(..)?
Is it dangerous to do this call without transaction?
Is the retrieved object instantiated in the second level cache, then?

Hibernate version: 2.1.7


Name and version of the database you are using: Oracle 9i

Thanks in advance for any hint, Rolf
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michael
 Post subject:
PostPosted: Tue Feb 15, 2005 7:28 am 
Hibernate Team
Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany
Yes, you should always manage your transactions.
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Rolf.Knoll
 Post subject:
PostPosted: Tue Feb 15, 2005 7:41 am 
Newbie

Joined: Tue Feb 15, 2005 6:54 am
Posts: 3
Hi Michael,
thanks for the quick reply.

I would like to understand this requirement. Up to now I thought I need no transaction as long as I do not change persistent objects. I know this behaviour from other O/R mappers.

Why do I need a transaction and what could happen if I call a query without transaction. Could this cause serious problems?

Regards, Rolf
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michael
 Post subject:
PostPosted: Tue Feb 15, 2005 8:12 am 
Hibernate Team
Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany
This has been discussed extensively already here at this forum. Please use the search function.
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Rolf.Knoll
 Post subject:
PostPosted: Tue Feb 15, 2005 8:59 am 
Newbie

Joined: Tue Feb 15, 2005 6:54 am
Posts: 3
Sorry to disturb you again,
which key words would lead to the right discussion?

Thanks Rolf
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