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python Programming Glossary: transactionHow do I define a unique property for a Model in Google App Engine? http://stackoverflow.com/questions/1185628/how-do-i-define-a-unique-property-for-a-model-in-google-app-engine to duplicate values. To prevent this you will have to use transactions Transactions Google App Engine If you're looking to check for.. looking to check for uniqueness across all entities with transactions you'd have to put all of them in the same group using the first.. the first method which would be very inefficient. For transactions use the second method like this class UniqueConstraint db.Model..
DatabaseError: current transaction is aborted, commands ignored until end of transaction block http://stackoverflow.com/questions/2979369/databaseerror-current-transaction-is-aborted-commands-ignored-until-end-of-tra current transaction is aborted commands ignored until end of transaction block .. transaction is aborted commands ignored until end of transaction block I got a lot of errors with the message DatabaseError.. got a lot of errors with the message DatabaseError current transaction is aborted commands ignored until end of transaction block after..
How do I force Django to ignore any caches and reload data? http://stackoverflow.com/questions/3346124/how-do-i-force-django-to-ignore-any-caches-and-reload-data another answer. This is a problem with MySQL's default transaction mode. Django opens a transaction at the start which means that.. with MySQL's default transaction mode. Django opens a transaction at the start which means that by default you won't see changes.. terminal 1 demonstrate the solution from django.db import transaction @transaction.commit_manually ... def flush_transaction ... transaction.commit..
How to implement “autoincrement” on Google AppEngine http://stackoverflow.com/questions/3985812/how-to-implement-autoincrement-on-google-appengine you'll need to use a single entity which you update in a transaction to 'consume' each new number. You'll be limited in practice..
Creating a logging handler to connect to Oracle? http://stackoverflow.com/questions/935930/creating-a-logging-handler-to-connect-to-oracle can buffer several events and write them all in a single transaction every so often. Below is an example which uses mx.ODBC you can..
Error: AttributeError: Transaction instance has no attribute 'trans_handle' http://stackoverflow.com/questions/12781696/error-attributeerror-transaction-instance-has-no-attribute-trans-handle AttributeError Transaction instance has no attribute 'trans_handle' I wrote the program.. self.transaction.trans_handle query AttributeError Transaction instance has no attribute 'trans_handle' python sql database..
Threaded Django task doesn't automatically handle transactions or db connections? http://stackoverflow.com/questions/1303654/threaded-django-task-doesnt-automatically-handle-transactions-or-db-connections unfinished database connection processes pgsql Idle In Transaction . I looked through the Postgres logs and found that the transactions.. source code I've found the answer to my own question Transactions Django's default autocommit behavior still holds true for my..
How to pass initial parameter to django's ModelForm instance? http://stackoverflow.com/questions/1697702/how-to-pass-initial-parameter-to-djangos-modelform-instance instance The particular case I have is like this I have a Transaction model with fields from to both are ForeignKey s to auth.User.. to change the ModelForm to something like this class AddTransaction forms.ModelForm from ModelChoiceField user.peers amount forms.CharField.. forms.CharField label 'How much ' class Meta model models.Transaction But it seems I have to pass the queryset of choices for ModelChoiceField..
In Django, can you add a method to querysets? http://stackoverflow.com/questions/4576622/in-django-can-you-add-a-method-to-querysets have a model class e.g. from django.db import models class Transaction models.Model ... then if I want to add methods to the model.. filters I can add a custom model manager e.g. class TransactionManager models.Manager def reasonably_complex_filter self return.. self return self.get_query_set .filter ... class Transaction models.Model objects TransactionManager And then I can do Transaction.objects.reasonably_complex_filter..
http://stackoverflow.com/questions/541329/is-it-possible-to-programmatically-construct-a-python-stack-frame-and-start-exec of the interpreter. The three remaining problems are Transaction state and 'saga' rollback which can probably be accomplished..
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