Set new Melange version number to 0-5-20090705 in app.yaml.template.
import osfrom django.conf import settingsfrom django.core import signalsfrom django.core.exceptions import ImproperlyConfiguredfrom django.utils.functional import curry__all__ = ('backend', 'connection', 'DatabaseError', 'IntegrityError')if not settings.DATABASE_ENGINE: settings.DATABASE_ENGINE = 'dummy'try: # Most of the time, the database backend will be one of the official # backends that ships with Django, so look there first. _import_path = 'django.db.backends.' backend = __import__('%s%s.base' % (_import_path, settings.DATABASE_ENGINE), {}, {}, [''])except ImportError, e: # If the import failed, we might be looking for a database backend # distributed external to Django. So we'll try that next. try: _import_path = '' backend = __import__('%s.base' % settings.DATABASE_ENGINE, {}, {}, ['']) except ImportError, e_user: # The database backend wasn't found. Display a helpful error message # listing all possible (built-in) database backends. backend_dir = os.path.join(__path__[0], 'backends') try: available_backends = [f for f in os.listdir(backend_dir) if not f.startswith('_') and not f.startswith('.') and not f.endswith('.py') and not f.endswith('.pyc')] except EnvironmentError: available_backends = [] available_backends.sort() if settings.DATABASE_ENGINE not in available_backends: raise ImproperlyConfigured, "%r isn't an available database backend. Available options are: %s\nError was: %s" % \ (settings.DATABASE_ENGINE, ", ".join(map(repr, available_backends)), e_user) else: raise # If there's some other error, this must be an error in Django itself.# Convenient aliases for backend bits.connection = backend.DatabaseWrapper(**settings.DATABASE_OPTIONS)DatabaseError = backend.DatabaseErrorIntegrityError = backend.IntegrityError# Register an event that closes the database connection# when a Django request is finished.def close_connection(**kwargs): connection.close()signals.request_finished.connect(close_connection)# Register an event that resets connection.queries# when a Django request is started.def reset_queries(**kwargs): connection.queries = []signals.request_started.connect(reset_queries)# Register an event that rolls back the connection# when a Django request has an exception.def _rollback_on_exception(**kwargs): from django.db import transaction try: transaction.rollback_unless_managed() except DatabaseError: passsignals.got_request_exception.connect(_rollback_on_exception)