class DatabaseWrapper(WRAPPED_BACKEND.DatabaseWrapper):
def __init__(self, *args, **kwargs):
super(DatabaseWrapper, self).__init__(*args, **kwargs)
self.threadlocal = MultiTenantThreadlocal()
def get_threadlocal(self):
return self.threadlocal
def create_cursor(self, name=None):
cursor = self.connection.cursor()
return CursorWrapper(cursor)
def _cursor(self):
"""Supplies a cursor, executing the `USE` statement if required.
Ideally we'd override a get_new_connection DatabaseWrapper function,
but _cursor() is as close as it gets.
"""
cursor = super(DatabaseWrapper, self)._cursor()
db_name = self.threadlocal.get_db_name()
if not db_name:
# Django loads the settings after it tries to connect to mysql, when
# running management commands If that's the case, update database
# name manually
update_database_from_env(
super(DatabaseWrapper, self).get_connection_params()
)
db_name = self.threadlocal.get_db_name()
if not db_name:
raise ImproperlyConfigured("db_name not set at cursor create time")
# Cache the applied db_name as "mt_db_name" on the connection, avoiding
# an extra execute() if already set. Importantly, we assume no other
# code in the app is executing `USE`.
connection = cursor.cursor.connection
connection_db_name = getattr(connection, "mt_db_name", None)
if connection_db_name != db_name:
start_time = time.time()
cursor.execute("USE `%s`;" % db_name)
time_ms = int((time.time() - start_time) * 1000)
LOGGER.debug("Applied db_name `%s` in %s ms", db_name, time_ms)
connection.mt_db_name = db_name
return cursor
class DatabaseWrapper(WRAPPED_BACKEND.DatabaseWrapper):
def __init__(self, *args, **kwargs):
super(DatabaseWrapper, self).__init__(*args, **kwargs)
self.threadlocal = MultiTenantThreadlocal()
def get_threadlocal(self):
return self.threadlocal
def _cursor(self):
"""Supplies a cursor, executing the `USE` statement if required.
Ideally we'd override a get_new_connection DatabaseWrapper function,
but _cursor() is as close as it gets.
"""
cursor = super(DatabaseWrapper, self)._cursor()
db_name = self.threadlocal.get_db_name()
if not db_name:
# Django loads the settings after it tries to connect to mysql, when
# running management commands If that's the case, update database
# name manually
update_database_from_env(super(DatabaseWrapper, self).get_connection_params())
db_name = self.threadlocal.get_db_name()
if not db_name:
raise ImproperlyConfigured('db_name not set at cursor create time')
# Cache the applied db_name as "mt_db_name" on the connection, avoiding
# an extra execute() if already set. Importantly, we assume no other
# code in the app is executing `USE`.
connection = cursor.cursor.connection
connection_db_name = getattr(connection, 'mt_db_name', None)
if connection_db_name != db_name:
start_time = time.time()
cursor.execute('USE `%s`;' % db_name)
time_ms = int((time.time() - start_time) * 1000)
LOGGER.debug('Applied db_name `%s` in %s ms', db_name, time_ms)
connection.mt_db_name = db_name
return cursor
