def validate_thread_sharing(self):
"""
Validates that the connection isn't accessed by another thread than the
one which originally created it, unless the connection was explicitly
authorized to be shared between threads (via the `allow_thread_sharing`
property). Raises an exception if the validation fails.
"""
if (not self.allow_thread_sharing
and self._thread_ident != thread.get_ident()):
raise DatabaseError("DatabaseWrapper objects created in a "
"thread can only be used in that same thread. The object "
"with alias '%s' was created in thread id %s and this is "
"thread id %s."
% (self.alias, self._thread_ident, thread.get_ident()))
def savepoint(self):
"""
Creates a savepoint (if supported and required by the backend) inside the
current transaction. Returns an identifier for the savepoint that will be
used for the subsequent rollback or commit.
"""
thread_ident = thread.get_ident()
self.savepoint_state += 1
tid = str(thread_ident).replace('-', '')
sid = "s%s_x%d" % (tid, self.savepoint_state)
self._savepoint(sid)
return sid
def __init__(self, settings_dict, alias=DEFAULT_DB_ALIAS,
allow_thread_sharing=False):
# `settings_dict` should be a dictionary containing keys such as
# NAME, USER, etc. It's called `settings_dict` instead of `settings`
# to disambiguate it from Django settings modules.
self.connection = None
self.queries = []
self.settings_dict = settings_dict
self.alias = alias
self.use_debug_cursor = None
# Transaction related attributes
self.transaction_state = []
self.savepoint_state = 0
self._dirty = None
self._thread_ident = thread.get_ident()
self.allow_thread_sharing = allow_thread_sharing
