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from django.core import signals
from django.db.utils import (
DEFAULT_DB_ALIAS, DJANGO_VERSION_PICKLE_KEY, ConnectionHandler,
ConnectionRouter, DatabaseError, DataError, Error, IntegrityError,
InterfaceError, InternalError, NotSupportedError, OperationalError,
ProgrammingError,
)
from django.utils.connection import ConnectionProxy
__all__ = [
'connection', 'connections', 'router', 'DatabaseError', 'IntegrityError',
'InternalError', 'ProgrammingError', 'DataError', 'NotSupportedError',
'Error', 'InterfaceError', 'OperationalError', 'DEFAULT_DB_ALIAS',
'DJANGO_VERSION_PICKLE_KEY',
]
connections = ConnectionHandler()
router = ConnectionRouter()
# For backwards compatibility. Prefer connections['default'] instead.
connection = ConnectionProxy(connections, DEFAULT_DB_ALIAS)
# Register an event to reset saved queries when a Django request is started.
def reset_queries(**kwargs):
for conn in connections.all():
conn.queries_log.clear()
signals.request_started.connect(reset_queries)
# Register an event to reset transaction state and close connections past
# their lifetime.
def close_old_connections(**kwargs):
for conn in connections.all():
conn.close_if_unusable_or_obsolete()
signals.request_started.connect(close_old_connections)
signals.request_finished.connect(close_old_connections)
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