[1.0.X] Backport of 10022 from trunk. Added savepoint support to the Oracle backend, necessary per the thread at http://groups.google.com/group/django-developers/browse_thread/thread/c87cf2d97478c068/

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10023 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/oracle/base.py

@@ -36,6 +36,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     needs_datetime_string_cast = False
     uses_custom_query_class = True
     interprets_empty_strings_as_nulls = True
+    uses_savepoints = True
 
 
 class DatabaseOperations(BaseDatabaseOperations):
@@ -147,6 +148,12 @@ WHEN (new.%(col_name)s IS NULL)
         connection.cursor()
         return connection.ops.regex_lookup(lookup_type)
 
+    def savepoint_create_sql(self, sid):
+        return "SAVEPOINT " + self.quote_name(sid)
+
+    def savepoint_rollback_sql(self, sid):
+        return "ROLLBACK TO SAVEPOINT " + self.quote_name(sid)
+
     def sql_flush(self, style, tables, sequences):
         # Return a list of 'TRUNCATE x;', 'TRUNCATE y;',
         # 'TRUNCATE z;'... style SQL statements
@@ -293,6 +300,10 @@ class DatabaseWrapper(BaseDatabaseWrapper):
             cursor = FormatStylePlaceholderCursor(self.connection)
         return cursor
 
+    # Oracle doesn't support savepoint commits.  Ignore them.
+    def _savepoint_commit(self, sid):
+        pass
+
 
 class OracleParam(object):
     """