Morvin-Ian / django-multiple-databases

django-multiple-database

1: Configure the Databases

In the settings.py file, define the configurations for the multiple databases.

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'default_db',
        'USER': 'your_username',
        'PASSWORD': 'your_password',
        'HOST': 'localhost',
        'PORT': '',
    },
    'second_db': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'second_db',
        'USER': 'your_username',
        'PASSWORD': 'your_password',
        'HOST': 'localhost',
        'PORT': '',
    }
}

2: Create Database Router

Next, you need to create a database router to handle the database routing logic. The router determines which database to use for each database operation.

class MultiDBRouter:
    def db_for_read(self, model, **hints):
        if model._meta.app_label == 'your_app_label':
            return 'second_db'
        return 'default'

    def db_for_write(self, model, **hints):
        if model._meta.app_label == 'your_app_label':
            return 'second_db'
        return 'default'

    def allow_relation(self, obj1, obj2, **hints):
        db1 = getattr(obj1, "_state").db
        db2 = getattr(obj2, "_state").db
        if db1 == 'second_db' or db2 == 'second_db':
            return True
        return db1 == db2

    def allow_migrate(self, db, app_label, model_name=None, **hints):
        if app_label == 'your_app_label':
            return db == 'second_db'
        return db == 'default'

3: Configure Database Router in Settings

DATABASE_ROUTERS = ['project_name.routers.MultiDBRouter']