pymysql breaks last_executed_query()

[christian.oudard@…]

In last_executed_query(), the value returned by cursor._last_executed is unconditionally decoded as utf8. This presumes that it is a byte string with utf8 encoding.

On the MySQLdb driver, this is true, but on pymysql, it returns a unicode string instead. This prevents anyone from running queries containing unicode characters in debug mode while using pymysql.

I can make a patch for this if necessary.

[Anssi Kääriäinen]

Patches welcome.

[Russell Keith-Magee]

Is PyMySQL really a drop in replacement for MySQLdb? It looks to me like the base package name is different, so I don't see how it is possible that this works at all without either an import shim, or a completely different database backend.

[Claude Paroz]

I have a branch which more or less supports PyMySQL.
​https://github.com/claudep/django/compare/pymysql

Quoting Alex (regarding the above branch):
The right way to do this type of thing is to really split the adapter part of a database backend away from the database part of it. So we can easily have PyMySQL, MySQLdb, psycopg2, pg8000, py-postgresql, postgresql-ctypes, and whatever else shows up, without needing to continually add to the chain of except ImportError.

[Collin Anderson]

See also #22391

[Collin Anderson]

Closing now that mysqlclient is our official recommended connector.