Oleg Broytmann wrote:
> On Mon, Feb 11, 2008 at 09:21:56PM -0500, Nathan Edwards wrote:
>> If I change "a = A.byValue(1)" to "pass" the exceptions go away...it
>> seems like the exception puts the connection in a bad state.
>
> My guess is that after any unhandled exception you must rollback the
> connection.
I'm not using transactions explicitly, each insert is atomic, so
autoCommit is fine for me.
How do I issue a rollback on a connection - is there an implicit
transaction here?
Why is there a difference between 1 thread and many threads?
Is this what you are suggesting?
def thr1():
for i in range(1000):
tr = A._connection.transaction()
try:
A(value=1)
tr.commit(close=True)
except dberrors.DuplicateEntryError:
tr.rollback()
a = A.byValue(1)
Does not get rid of the "Commands out of sync..." exception.
I also tried:
def thr1():
sqlhub.threadConnection = connectionForURI(connuri)
for i in range(1000):
tr = sqlhub.threadConnection.transaction()
try:
a = AAA(value=1)
tr.commit()
except dberrors.DuplicateEntryError:
tr.rollback()
a = AAA.byValue(1)
Still no luck.
Is there a better idiom for: Create a new object unless it already
exists (as defined by UNIQUE indexes), if so get it. I can't just check
with a select because some other process or thread may create the object
before I can, hence the DuplicateEntryError.
- n
--
Dr. Nathan Edwards [EMAIL PROTECTED]
Department of Biochemistry and Molecular & Cellular Biology
Georgetown University Medical Center
Room 1215, Harris Building Room 347, Basic Science
3300 Whitehaven St, NW 3900 Reservoir Road, NW
Washington DC 20007 Washington DC 20007
Phone: 202-687-7042 Phone: 202-687-1618
Fax: 202-687-0057 Fax: 202-687-7186
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