Re: [castor-dev] what makes JDO think objects are dirty?

[Rhett Sutphin]

On Tuesday, November 12, 2002, at 10:45  PM, Thomas Olausson wrote:

What do I have to tell JDO to load objects
from the database everytime (to make sure
I have fresh data)?

I have a server that finds some objects,
Simple like this:
# db.begin
# get some objects from OQL, using db.getOQLQuery() etc..
# I don't do any rollback or commit, since I don't need to save data

This is the problem: you must end the transaction, even if no data is modified. The idea behind transactions is that they allow you to work with the database pseudo-atomically -- with the data as it existed when the transaction started (when you called db.begin). You have to commit after you finish whatever amount of work needs to be done atomically, and then call db.begin before your next load.

Rhett

=====================================================
| Rhett Sutphin
| Research Assistant (Software)
| Coordinated Laboratory for Computational Genomics
| and the Center for Macular Degeneration
| University of Iowa - Iowa City, IA 52242 - USA
| 4111 MEBRF - email: [EMAIL PROTECTED]
=====================================================

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