Fixed #3024 -- Fixed database commit() and rollback() behaviour so it works

consistently if you execute them before Django has made a database connection.
Thanks Bastian Kleineidam.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@4691 bcc190cf-cafb-0310-a4f2-bffc1f526a37

AUTHORS

@@ -112,6 +112,7 @@ answer newbie questions, and generally made Django that much better:
     Garth Kidd <http://www.deadlybloodyserious.com/>
     kilian <kilian.cavalotti@lip6.fr>
     Sune Kirkeby <http://ibofobi.dk/>
+    Bastian Kleineidam <calvin@debian.org>
     Cameron Knight (ckknight)
     Meir Kriheli <http://mksoft.co.il/>
     Bruce Kroeze <http://coderseye.com/>

django/db/backends/ado_mssql/base.py

@@ -76,10 +76,11 @@ class DatabaseWrapper(local):
         return cursor
 
     def _commit(self):
+        if self.connection is not None:
             return self.connection.commit()
 
     def _rollback(self):
-        if self.connection:
+        if self.connection is not None:
             return self.connection.rollback()
 
     def close(self):

django/db/backends/mysql/base.py

@@ -108,10 +108,11 @@ class DatabaseWrapper(local):
         return cursor
 
     def _commit(self):
+        if self.connection is not None:
             self.connection.commit()
 
     def _rollback(self):
-        if self.connection:
+        if self.connection is not None:
             try:
                 self.connection.rollback()
             except Database.NotSupportedError:

django/db/backends/oracle/base.py

@@ -43,10 +43,11 @@ class DatabaseWrapper(local):
         return FormatStylePlaceholderCursor(self.connection)
 
     def _commit(self):
+        if self.connection is not None:
             self.connection.commit()
 
     def _rollback(self):
-        if self.connection:
+        if self.connection is not None:
             try:
                 self.connection.rollback()
             except Database.NotSupportedError:

django/db/backends/postgresql/base.py

@@ -92,10 +92,11 @@ class DatabaseWrapper(local):
         return cursor
 
     def _commit(self):
+        if self.connection is not None:
             return self.connection.commit()
 
     def _rollback(self):
-        if self.connection:
+        if self.connection is not None:
             return self.connection.rollback()
 
     def close(self):

django/db/backends/postgresql_psycopg2/base.py

@@ -60,10 +60,11 @@ class DatabaseWrapper(local):
         return cursor
 
     def _commit(self):
+        if self.connection is not None:
             return self.connection.commit()
 
     def _rollback(self):
-        if self.connection:
+        if self.connection is not None:
             return self.connection.rollback()
 
     def close(self):

django/db/backends/sqlite3/base.py

@@ -67,10 +67,11 @@ class DatabaseWrapper(local):
             return cursor
 
     def _commit(self):
+        if self.connection is not None:
             self.connection.commit()
 
     def _rollback(self):
-        if self.connection:
+        if self.connection is not None:
             self.connection.rollback()
 
     def close(self):