Moved standard SQL for savepoints in the base backend.

These methods are only called when uses_savepoints = True anyway.

django/db/backends/__init__.py

@@ -863,19 +863,19 @@ class BaseDatabaseOperations(object):
         "uses_savepoints" feature is True. The "sid" parameter is a string
         for the savepoint id.
         """
-        raise NotImplementedError
+        return "SAVEPOINT %s" % self.quote_name(sid)
 
     def savepoint_commit_sql(self, sid):
         """
         Returns the SQL for committing the given savepoint.
         """
-        raise NotImplementedError
+        return "RELEASE SAVEPOINT %s" % self.quote_name(sid)
 
     def savepoint_rollback_sql(self, sid):
         """
         Returns the SQL for rolling back the given savepoint.
         """
-        raise NotImplementedError
+        return "ROLLBACK TO SAVEPOINT %s" % self.quote_name(sid)
 
     def set_time_zone_sql(self):
         """

django/db/backends/mysql/base.py

@@ -355,15 +355,6 @@ class DatabaseOperations(BaseDatabaseOperations):
         items_sql = "(%s)" % ", ".join(["%s"] * len(fields))
         return "VALUES " + ", ".join([items_sql] * num_values)
 
-    def savepoint_create_sql(self, sid):
-        return "SAVEPOINT %s" % sid
-
-    def savepoint_commit_sql(self, sid):
-        return "RELEASE SAVEPOINT %s" % sid
-
-    def savepoint_rollback_sql(self, sid):
-        return "ROLLBACK TO SAVEPOINT %s" % sid
-
 class DatabaseWrapper(BaseDatabaseWrapper):
     vendor = 'mysql'
     operators = {

django/db/backends/postgresql_psycopg2/operations.py

@@ -175,15 +175,6 @@ class DatabaseOperations(BaseDatabaseOperations):
                         style.SQL_TABLE(qn(f.m2m_db_table()))))
         return output
 
-    def savepoint_create_sql(self, sid):
-        return "SAVEPOINT %s" % sid
-
-    def savepoint_commit_sql(self, sid):
-        return "RELEASE SAVEPOINT %s" % sid
-
-    def savepoint_rollback_sql(self, sid):
-        return "ROLLBACK TO SAVEPOINT %s" % sid
-
     def prep_for_iexact_query(self, x):
         return x