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Error using "ON DUPLICATE KEY UPDATE" with "executemany()" #106
Description
I'm getting the error below using ON DUPLICATE KEY UPDATE with executemany().
The same doesn't happen using execute() with 1 param at a time.
--- SQL ---
INSERT INTO usuarios
(active, email, age, name)
VALUES (%s, %s, %s, %s)
ON DUPLICATE KEY UPDATE
name = %s
--- PARAMS ---
(True, 'joao@email.com', 29, 'JoaoValues', 'NAME_UPDATE')
(True, 'alex@email.com', 29, 'AlexValues', 'NAME_UPDATE')
Error
File "c:\Projetos\Python\simple_sql_builder\.venv\Lib\site-packages\mysql\connector\cursor.py", line 519, in executemany
stmt = self._batch_insert(operation, seq_params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "c:\Projetos\Python\simple_sql_builder\.venv\Lib\site-packages\mysql\connector\cursor.py", line 465, in _batch_insert
raise ProgrammingError(
mysql.connector.errors.ProgrammingError: Not all parameters were used in the SQL statement
Activity
Ch3M4x commentedon Oct 8, 2026
Hello @AlexLanes,
Thank you for reporting this and sharing the example. We were able to reproduce the issue and will work on a fix.
We would also appreciate it if you could file a report in our MySQL bugs page which will be used to keep track of this issue.
Regards,
MySQL Team