Question

I have one database that I specifically using for Django. I ran into a simple problem. For the user authentication in the login I need to use data from another database(mysql) and table. Both the tables are in the same server. How can I do that? Thanks

Answer 1

You need to define both the databases in your settings.py. You should read through setting up multiple databases documentation. It’s pretty straight forward. Once you have databases configured and synchronized, you can manually select a database for a QuerySet as follows:

Model.objects.using('database').all()

Update:

To specify a connection for a model you can define a Router as follows.

from django.db import connections

class MyRouter(object):
    """
    This router object will take care of the database
    operations for models.
    """

    def db_for_read(self, model, **hints):
        if hasattr(model,'connection_name'):
            return model.connection_name
        return None

    def db_for_write(self, model, **hints):
        if hasattr(model,'connection_name'):
            return model.connection_name
        return None

    def allow_syncdb(self, db, model):
        if hasattr(model,'connection_name'):
            return model.connection_name == db
        return db == default

and then for your models in models.py you can do something like this:

class MyModel(models.Model):
    connection_name="filename"

Update#2

you can setup the router anywhere you like. All you need to do is pass the Routers path to the DATABASE_ROUTERS variable in the settings.py file. For the sake of cleanliness of code and being organised i generally do this in a separate routers.py file under my application folder and then set the DATABASE_ROUTERS

example:

DATABASE_ROUTERS = ['myapp.routers.MyRouter',]