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I have a django applicaiton with multiple databases. The default database is on the local machine. There is also a remote mysql database which is used for some write operations, but it is not always up. When the server is down, mysqldb raises an OperationalError.

I would like have a local sqlite database called 'fallback' which would accept the data if the mysql server is down. I realize that this involves at try/except clause in django.db.mysql.base, but I am not quite sure where to go from there. Has anyone tried something similar? Do you have suggestions on a better way to handle this?

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You could probably use Database Routers in combination with a custom base Model class that overrides the save method. Wrap it in a try..catch, and if the OperationalError occurs, provide some hints so your database router can determine if the fallback needs to be used.

I think this will be the cleanest way, rather than modifying the django code itself.

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+1 for convincing me not to modify django code. I didn't use routers due to the specific nature of the writes to the remote DB. See my solution at stackoverflow.com/questions/4945295/…. It hadn't been working, due a related error in a connection_created signal handler.
Routers does not deal with database connections and cursors (which are responsible of OperationalError).They just select a database alias, that's to say the key in your settings.DATABASES dictionary. Did you find an alternative way to test a database connection and select another one as fallback?
You're right @Marco. I'd, now, recommend doing a try: .using['primary'] except: .using['backup'] in the save method.

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