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Round-robin multidb router for Django 1.2.

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With multidb.MasterSlaveRouter all read queries will go to a slave database; all inserts, updates, and deletes will do to the default database.

First, define SLAVE_DATABASES in your settings. It should be a list of database aliases that can be found in DATABASES:

DATABASES = {
    'default': {...},
    'shadow-1': {...},
    'shadow-2': {...},
}
SLAVE_DATABASES = ['shadow-1', 'shadow-2']

Then put multidb.MasterSlaveRouter into DATABASE_ROUTERS:

DATABASE_ROUTERS = ('multidb.MasterSlaveRouter',)

The slave databases will be chosen in round-robin fashion.

If you want to get a connection to a slave in your app, use multidb.get_slave:

from django.db import connections
import multidb

connection = connections[multidb.get_slave()]

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