Op de juiste manier blobs uit de mysql-database halen met de mysql-connector in python

We kwamen hetzelfde probleem tegen dat BLOB's per ongeluk werden teruggelezen als UTF-8-strings met MySQL 8.0.13, mysql-connector-python 8.0.13 en sqlalchemy 1.2.14.

Wat de truc voor ons was, was het inschakelen van de use_pure optie van MySQL Connector . De standaard van use_pure was veranderd in 8.0.11 met als nieuwe standaard het gebruik van de C-extensie. Dus zetten we de optie terug:

create_engine(uri, connect_args={'use_pure': True}, ...)

Details van onze fout- en stacktracering:

UnicodeDecodeError: 'utf-8' codec can't decode byte 0x9c in position 1: invalid start byte
The above exception was the direct cause of the following exception:

Traceback (most recent call last):
    ....
    File "/usr/local/lib/python3.6/site-packages/mysql/connector/cursor_cext.py", line 272, in execute
        self._handle_result(result)
    File "/usr/local/lib/python3.6/site-packages/mysql/connector/cursor_cext.py", line 163, in _handle_result
        self._handle_resultset()
    File "/usr/local/lib/python3.6/site-packages/mysql/connector/cursor_cext.py", line 651, in _handle_resultset
        self._rows = self._cnx.get_rows()[0]
    File "/usr/local/lib/python3.6/site-packages/mysql/connector/connection_cext.py", line 273, in get_rows
        row = self._cmysql.fetch_row()
    SystemError: <built-in method fetch_row of _mysql_connector.MySQL object at 0x5627dcfdf9f0> returned a result with an error set