66 lines
2.4 KiB
Python
66 lines
2.4 KiB
Python
from django.conf import settings
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from django.core import signals
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from django.core.exceptions import ImproperlyConfigured
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from django.db.utils import (ConnectionHandler, ConnectionRouter,
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load_backend, DEFAULT_DB_ALIAS, DatabaseError, IntegrityError)
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__all__ = ('backend', 'connection', 'connections', 'router', 'DatabaseError',
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'IntegrityError', 'DEFAULT_DB_ALIAS')
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if DEFAULT_DB_ALIAS not in settings.DATABASES:
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raise ImproperlyConfigured("You must define a '%s' database" % DEFAULT_DB_ALIAS)
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connections = ConnectionHandler(settings.DATABASES)
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router = ConnectionRouter(settings.DATABASE_ROUTERS)
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# `connection`, `DatabaseError` and `IntegrityError` are convenient aliases
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# for backend bits.
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# DatabaseWrapper.__init__() takes a dictionary, not a settings module, so
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# we manually create the dictionary from the settings, passing only the
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# settings that the database backends care about. Note that TIME_ZONE is used
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# by the PostgreSQL backends.
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# We load all these up for backwards compatibility, you should use
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# connections['default'] instead.
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class DefaultConnectionProxy(object):
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"""
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Proxy for accessing the default DatabaseWrapper object's attributes. If you
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need to access the DatabaseWrapper object itself, use
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connections[DEFAULT_DB_ALIAS] instead.
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"""
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def __getattr__(self, item):
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return getattr(connections[DEFAULT_DB_ALIAS], item)
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def __setattr__(self, name, value):
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return setattr(connections[DEFAULT_DB_ALIAS], name, value)
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connection = DefaultConnectionProxy()
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backend = load_backend(connection.settings_dict['ENGINE'])
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# Register an event that closes the database connection
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# when a Django request is finished.
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def close_connection(**kwargs):
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for conn in connections.all():
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conn.close()
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signals.request_finished.connect(close_connection)
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# Register an event that resets connection.queries
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# when a Django request is started.
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def reset_queries(**kwargs):
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for conn in connections.all():
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conn.queries = []
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signals.request_started.connect(reset_queries)
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# Register an event that rolls back the connections
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# when a Django request has an exception.
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def _rollback_on_exception(**kwargs):
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from django.db import transaction
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for conn in connections:
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try:
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transaction.rollback_unless_managed(using=conn)
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except DatabaseError:
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pass
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signals.got_request_exception.connect(_rollback_on_exception)
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