Ok I found the solution, just move the first query into the transaction
body:
import transaction
try:
transaction.begin()
x_members = session.query(Distributor)...
for member in x_members:
.....
except:
transaction.abort()
BTW, I'm using pyramid framework, which is using the following statement to
init the session:
DBSession = scoped_session(sessionmaker(
extension=ZopeTransactionExtension()))
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