python - rollback is not working in django using commit_manually -


i looking import data csv file. need atomic transaction.i using django version 1.5.1. not able revert transaction if exception occurs.

  @transaction.commit_manually   def import_user_csv(request):      if request.method == 'post' , request.files.has_key('csv_file'):             csv_file = request.files['csv_file']              try:                i, row in enumerate(csv.reader(csv_file, delimiter=',')):                 if == 0:                     continue                 else:                      createduser, created  = user.objects.get_or_create(                         username=row[0],                         full_name=row[1]                     )                     _, userrolecreated = useroption.objects.get_or_create(                         user_id = createduser.id,                         user_role = "employee"                     )                                    except:               transaction.rollback()               print ("exception occured........")               #raise             else:               transaction.commit()


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