Thanks Mike! Your last suggestion was the best (ans easiest) solution, I guess I just needed someone to point that out to me ;-) Since I want the whole transaction to either succeed or fail, there's no need to use SAVEPOINTs.
Cheers, Simon On 3 Jul., 19:55, Michael Bayer <[EMAIL PROTECTED]> wrote: > On Jul 3, 2008, at 1:09 PM, Simon wrote: > > > > > Hi all, > > > I have a transactional session which save()s multiple objects to > > multiple tables where each object potentially violates a unique > > primary key or just a unique key constraint. At flush() time, MySQL > > returns an IntegrityError which specifies the value of the offending > > key and the key's number within its table (i.e. first key, second > > key...), but I cannot from this information figure out which of my > > objects is the culprit. Any suggestions on how to solve this problem? > > Ideally, I would like to rollback() the whole transaction when such an > > error occurs, regenerate the keys on the offending object, and repeat > > until commit() succeeds. > > use SQLA 0.5 if you'd like to rollback() a session and continue using > the objects within. Read > throughhttp://www.sqlalchemy.org/docs/05/session.html#unitofwork_using_rolling > and elsewhere to see what the SQLA contract is regarding sessions, > errors and rolling back. It's also worthwhile to give SAVEPOINT a > try, which allows partial transactions to commit and is described > athttp://www.sqlalchemy.org/docs/05/session.html#unitofwork_managing_sa... > . In particular, some databases such as Postgres do not allow the > transaction to continue if an integrity error is raised, necessitating > the use of SAVEPOINT, or just querying the table beforehand (which is > the traditional approach to this problem). --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
