Django Multiple Database Connectivity

Configuring Multiple Databases in Django.

Setting Up the Project

• Firstly clone/download the repo here

git clone https://github.com/vishalpolley/django-multidb.git

• Navigate inside the multidb folder

cd multidb/

• Install all the dependencies required for the project

pip install -r requirements.txt

Database Setup

The project Postgresql and MySQL as backend databases.

Postgresql Database Setup

The data of the fisrt app is being saved in the postgresql database. The default database is form, which can be easily changed through the settings.py file.

Configuring Postgres Installation

• After installing postgresql database, open psql by running the following commands

sudo -u postgres psql postgres

• Set up password for the default postgres user

\password postgres

• Enter the password
• Quit psql

\q

Creation of Databases in Postgresql

• For creating the database, open psql by executing the following commands

sudo -u postgres psql

• Now create a new database named as form

postgres=# createdb form;

• The default database setup for Postgresql for app1 in settings.py file are as follows :-

'form1_db': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'form',
        'USER': 'enter postgres username', # Default is postgres
        'PASSWORD': 'enter postgres password',
        'HOST': 'localhost',
        'PORT': '',
    },

MySQL Database Setup

The data of the second app is being saved in the MySQL database. The default database is 'form', which can be easily changed through the settings.py file.

• After installing MySQL, open it by running the command

mysql -u root

• Now create a database named as form

CREATE DATABASE form;

• The default database setup for MySQL for app2 in settings.py file are as follows :-

'form2_db': {
        'NAME': 'form',
        'ENGINE': 'django.db.backends.mysql',
        'HOSTNAME': 'localhost',
        'USER': 'enter mysql username', # Default is root
        'PASSWORD': 'enter mysql password', 
        'OPTIONS': {
                'autocommit': True,
        },
    },

Run the Project

After setting up both the databases run the migrations

• Run the migrations for the postgresql database for app1

python manage.py migrate --database=form1_db

• Run the migrations for the mysql database for app2

python manage.py migrate --database=form2_db

• Now run the server by using

python manage.py runserver

• Enter the following URL to navigate to the first app

http://127.0.0.1:8000/app1/

• Enter the following URL to navigate to the first app

http://127.0.0.1:8000/app2/

• Check the database enteries on Django admin

http://127.0.0.1:8000/admin/

Enter the default credentials to login to the Django admin

username: user
password: qwerty123

Checking the entries over individual databases

Postgresql

The database enties for the App1 are stored in app1_form1 table

• To fetch the entries from the table, execute the following query over psql

form=# select * from app1_form1;

You get the entries in the following format

 id | first_name | last_name 
----+------------+-----------
  4 | Vishal     | Polley
(1 row)

MySQL

The database enties for the App2 are stored in app2_form2 table

• To fetch the entries from the table, execute the following query over mysql cli

MariaDB [form]> select * from app2_form2;

You get the entries in the following format

+----+-------------+-------------+
| id | father_name | mother_name |
+----+-------------+-------------+
|  4 | Vishwajeet  | Shyamali    |
+----+-------------+-------------+
1 row in set (0.00 sec)