def get_connection(cls):
'''
This method is multi-db ready. It uses your site's db router to determine which
database the view is in.
'''
db = ConnectionRouter().db_for_read(cls())
return connections[db]
OperationalError,
ProgrammingError,
)
__all__ = [
'backend', 'connection', 'connections', 'router', 'DatabaseError',
'IntegrityError', 'InternalError', 'ProgrammingError', 'DataError',
'NotSupportedError', 'Error', 'InterfaceError', 'OperationalError',
'DEFAULT_DB_ALIAS', 'DJANGO_VERSION_PICKLE_KEY'
]
# 管理各种alias的请求
connections = ConnectionHandler()
# 路由
router = ConnectionRouter()
# `connection`, `DatabaseError` and `IntegrityError` are convenient aliases
# for backend bits.
# DatabaseWrapper.__init__() takes a dictionary, not a settings module, so we
# manually create the dictionary from the settings, passing only the settings
# that the database backends care about.
# We load all these up for backwards compatibility, you should use
# connections['default'] instead.
class DefaultConnectionProxy(object):
"""
Proxy for accessing the default DatabaseWrapper object's attributes. If you
need to access the DatabaseWrapper object itself, use
connections[DEFAULT_DB_ALIAS] instead.
elif database['ENGINE'] == 'sqlite3':
full_engine = 'django.contrib.gis.db.backends.spatialite'
else:
full_engine = 'django.contrib.gis.db.backends.%s' % database[
'ENGINE']
else:
warnings.warn(
"Short names for ENGINE in database configurations are deprecated. "
"Prepend %s.ENGINE with 'django.db.backends.'" % alias,
DeprecationWarning)
full_engine = "django.db.backends.%s" % database['ENGINE']
database['ENGINE'] = full_engine
connections = ConnectionHandler(settings.DATABASES)
router = ConnectionRouter(settings.DATABASE_ROUTERS)
# `connection`, `DatabaseError` and `IntegrityError` are convenient aliases
# for backend bits.
# DatabaseWrapper.__init__() takes a dictionary, not a settings module, so
# we manually create the dictionary from the settings, passing only the
# settings that the database backends care about. Note that TIME_ZONE is used
# by the PostgreSQL backends.
# we load all these up for backwards compatibility, you should use
# connections['default'] instead.
connection = connections[DEFAULT_DB_ALIAS]
backend = load_backend(connection.settings_dict['ENGINE'])
# Register an event that closes the database connection
def clear_routers_cache(**kwargs):
if kwargs['setting'] == 'DATABASE_ROUTERS':
router.routers = ConnectionRouter().routers
def clear_routers_cache(**kwargs):
if kwargs["setting"] == "DATABASE_ROUTERS":
router.routers = ConnectionRouter().routers
def clear_routers_cache(*, setting, **kwargs):
if setting == "DATABASE_ROUTERS":
router.routers = ConnectionRouter().routers
