Bad exception raised for null inserts

[claudep]

The legacy MySQLdb1 raises an IntegrityError when doing a null insert in a not-nullable column. Apparently, this fork is raising OperationalError. The old behavior should be restored if possible.

[methane]

MySQLdb1 also raises OperationalError.
django.db.backend.mysql convert OperationalError to IntegrityError.
https://github.com/django/django/blob/master/django/db/backends/mysql/base.py#L129-134

[methane]

OK. mysqlclient fails to reraise exception.

In [28]: try:
   ....:     cur.execute("INSERT INTO model_fields_booleanmodel (bfield, string) values (NULL, 'xyz')")
   ....: except Exception as e:
   ....:     exc = e
In [29]: e
Out[29]:
_mysql_exceptions.OperationalError(_mysql_exceptions.OperationalError(1048,
                                                                      "Column 'bfield' cannot be null"))

In [30]: e.args
Out[30]: (_mysql_exceptions.OperationalError(1048, "Column 'bfield' cannot be null"),)

In [31]: e.args[0]
Out[31]: _mysql_exceptions.OperationalError(1048, "Column 'bfield' cannot be null")

In [32]: e.args[0][0]
Out[32]: 1048