Connect database from the view

I have this configuration in the settings.py to work with sql server that works fine

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'almaceninterno',
        'USER': 'postgres',
        'PASSWORD': 'postgres',
        'HOST': 'localhost',
        'PORT': '5432',

    },'conexion2': {
        'ENGINE': 'sql_server.pyodbc',
        'NAME': 'almacenexterno',
        'USER': 'sa',
        'PASSWORD': '123456789',
        'HOST': 'localhost',
        'PORT': '',
        'OPTIONS': {
            'driver': 'SQL Server Native Client 10.0',
        }
    }

but I want to do the following with the connection2

 'conexion2': {
        'ENGINE': 'sql_server.pyodbc',
        'NAME': '',
        'USER': '',
        'PASSWORD': '',
        'HOST': '',
        'PORT': '',
        'OPTIONS': {
            'driver': 'SQL Server Native Client 10.0',
        }
    }

and fill the missing data in a class in the view through ajax where the host, user and password first put me to perform the following query SELECT name FROM master.dbo.sysdatabases where name! = 'Master' and name! = 'Model' and name! = 'Msdb' and name! = 'ReportServer' and name! = 'ReportServerTempDB' and name! = 'Tempdb' that would show a select with the list of the databases, for later in another class complete the connection to the chosen database and save that connection data in a table that is in the default database, I hope you can help me.