#NEWLINE# def savepoint_rollback( self , sid ) : #NEWLINE# #INDENT# '\n        Rolls back to a savepoint. Does nothing if savepoints are not supported.\n        ' #NEWLINE# if ( not self . _savepoint_allowed ( ) ) : #NEWLINE# #INDENT# return #NEWLINE# #UNINDENT# self . validate_thread_sharing ( ) #NEWLINE# self . _savepoint_rollback ( sid )