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Slight refactoring of isolation setting from r10029. 

There was a bug in the way we were reading the DATABASE_OPTIONS setting
and a lot of essentially duplicated code. This is neater.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10033 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick 2009-03-12 05:30:51 +00:00
parent 90a3c34b35
commit d4677d4bfb
1 changed files with 13 additions and 26 deletions
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39
django/db/backends/postgresql_psycopg2/base.py
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@ -63,12 +63,9 @@ class DatabaseWrapper(BaseDatabaseWrapper):
super(DatabaseWrapper, self).__init__(*args, **kwargs)
self.features = DatabaseFeatures()
if settings.DATABASE_OPTIONS.get('autocommit', False):
self.features.uses_autocommit = True
self._iso_level_0()
else:
self.features.uses_autocommit = False
self._iso_level_1()
autocommit = self.settings_dict["DATABASE_OPTIONS"].get('autocommit', False)
self.features.uses_autocommit = autocommit
self._set_isolation_level(int(not autocommit))
self.ops = DatabaseOperations()
self.client = DatabaseClient(self)
self.creation = DatabaseCreation(self)
@ -116,7 +113,7 @@ class DatabaseWrapper(BaseDatabaseWrapper):
the same transaction is visible across all the queries.
"""
if self.features.uses_autocommit and managed and not self.isolation_level:
self._iso_level_1()
self._set_isolation_level(1)
def _leave_transaction_management(self, managed):
"""
@ -124,29 +121,19 @@ class DatabaseWrapper(BaseDatabaseWrapper):
leaving transaction management.
"""
if self.features.uses_autocommit and not managed and self.isolation_level:
self._iso_level_0()
self._set_isolation_level(0)
def _iso_level_0(self):
def _set_isolation_level(self, level):
"""
Do all the related feature configurations for isolation level 0. This
doesn't touch the uses_autocommit feature, since that controls the
movement *between* isolation levels.
Do all the related feature configurations for changing isolation
levels. This doesn't touch the uses_autocommit feature, since that
controls the movement *between* isolation levels.
"""
assert level in (0, 1)
try:
if self.connection is not None:
self.connection.set_isolation_level(0)
self.connection.set_isolation_level(level)
finally:
self.isolation_level = 0
self.features.uses_savepoints = False
def _iso_level_1(self):
"""
The "isolation level 1" version of _iso_level_0().
"""
try:
if self.connection is not None:
self.connection.set_isolation_level(1)
finally:
self.isolation_level = 1
self.features.uses_savepoints = True
self.isolation_level = level
self.features.uses_savepoints = bool(level)