Using Multiple Databases with django

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To use multiple databases you have to tell Django about the database server you will be using, but adding them in the settings.py.

Multiple databases

    'default': {
        'NAME': 'app_data',
        'ENGINE': 'django.db.backends.postgresql',
        'USER': 'postgres_user',
        'PASSWORD': 's3krit'
    },
    'users': {
        'NAME': 'user_data',
        'ENGINE': 'django.db.backends.mysql',
        'USER': 'mysql_user',
        'PASSWORD': 'priv4te'
    }
}

The migrate management command operates on one database at a time. By default, it operates on the default database, but by providing the –database option, you can tell it to synchronize a different database.

$ ./manage.py migrate --database=users
$ ./manage.py migrate --database=customers

You can manually select the database in your queries queries e.g

user = User(....)
user.save(using='users')

Customer.objects.all().using('users')

Using raw cursor

with connections['users'].cursor() as cursor:
     cursor.execute("SELECT * FROM users__users")

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