I am working on a Django project where I need to use both mysql/postgresql as well as mongoDB, one as primary and one as secondary database. How do I configure my db settings to use two databases?
I am able to use 1 database as postgresql or mongoDB, but not able to use both. I have provided the code below of what I have tried.
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'HOST': os.environ.get("DB_HOST", DB_HOST),
'PORT': os.environ.get('DB_PORT', DB_PORT),
'NAME': os.environ.get("DB_NAME", DB_NAME),
'USER': os.environ.get("DB_USER", DB_USER),
'PASSWORD': os.environ.get("DB_PASSWORD", DB_PASSWORD),
},
}
I have figured out the solution to this. We would need to use a third party plugin called Django MongoDB Engine.
Documentation: https://django-mongodb-engine.readthedocs.io/en/latest/topics/setup.html
'default': {
'NAME': 'user_data',
'ENGINE': 'django.db.backends.mysql',
'USER': 'mysql_user',
'PASSWORD': 'priv4te'
},
'mongo' : {
'ENGINE' : 'django_mongodb_engine',
'NAME' : 'my_database'
}
}```
Related
I have a database created from non-django app and have defined the database connection info like below
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('POSTGRES_DB'),
'USER': os.environ.get('POSTGRES_USER'),
'PASSWORD': os.environ.get('POSTGRES_PASSWORD'),
'HOST': os.environ.get('POSTGRES_HOST'),
'PORT': os.environ.get('POSTGRES_PORT'),
}
}
Unfortunately, when I migrate the django admin related tables, they all go into the default database.
I know that it is possible to declare multiple databases and separate read and write actions to different databases; however, what I would like to do is to have all the default django admin related tables to be created into another database. Say I declare a second database like below, how do I make sure that django admin related datas get migrated to the second database and also read from that when I login to django admin?
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('POSTGRES_DB'),
'USER': os.environ.get('POSTGRES_USER'),
'PASSWORD': os.environ.get('POSTGRES_PASSWORD'),
'HOST': os.environ.get('POSTGRES_HOST'),
'PORT': os.environ.get('POSTGRES_PORT'),
},
'admin':{
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('ADMIN_POSTGRES_DB'),
'USER': os.environ.get('ADMIN_POSTGRES_USER'),
'PASSWORD': os.environ.get('ADMIN_POSTGRES_PASSWORD'),
'HOST': os.environ.get('ADMIN_POSTGRES_HOST'),
'PORT': os.environ.get('ADMIN_POSTGRES_PORT'),
}
}
first you must leave default dictionary as empty
then define your database for admin and non admin
for examample do this
DATABASES = {
'default':{},
'nonAdmin': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('POSTGRES_DB'),
'USER': os.environ.get('POSTGRES_USER'),
'PASSWORD': os.environ.get('POSTGRES_PASSWORD'),
'HOST': os.environ.get('POSTGRES_HOST'),
'PORT': os.environ.get('POSTGRES_PORT'),
},
'admin':{
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('ADMIN_POSTGRES_DB'),
'USER': os.environ.get('ADMIN_POSTGRES_USER'),
'PASSWORD': os.environ.get('ADMIN_POSTGRES_PASSWORD'),
'HOST': os.environ.get('ADMIN_POSTGRES_HOST'),
'PORT': os.environ.get('ADMIN_POSTGRES_PORT'),
}
}
then after that you can migrate database using
./manage.py migrate --database=admin
or
./manage.py migrate --database=nonAdmin
If you don’t want every application to be synchronized onto a particular database, you can define a database router that implements a policy constraining the availability of particular models.
by using this method
allow_migrate(db, app_label, model_name=None, **hints)
you can reference this document https://docs.djangoproject.com/en/3.0/topics/db/multi-db/#topics-db-multi-db-routing
The django project has multiple apps and they all right now access the same DB. If I want one app which has only read queries to read from read replica will I have to add routers for both DB or creating one router for read replica and alloting it to the app will work? Is there a better way to do this?
you can use multiple database as defined in documentation:
https://docs.djangoproject.com/en/2.0/topics/db/multi-db/
Ex:
DATABASES = {
'default': {
'NAME': 'user_data',
'ENGINE': 'django.db.backends.mysql',
'USER': 'mysql_user',
'PASSWORD': 'password1'
},
'read_replica': {
'NAME': 'customer_data',
'ENGINE': 'django.db.backends.mysql',
'USER': 'mysql_cust',
'PASSWORD': 'password2'
}
}
After use a Database Router (django.db.router):
https://docs.djangoproject.com/en/2.0/topics/db/multi-db/#using-routers
There is a DATABASE_ROUTERS config as well.
When working with GeoDjango I have a problem: when I make migrations then migrate new models the log said "no migrations to apply" and the oracle database still have no new table.
my settings.py is
DATABASES = {
"default": {
"ENGINE": "django.contrib.gis.db.backends.oracle",
"NAME":,
"USER":,
"PASSWORD":,
}
}
I need some help.
I can see you are learning, see:
DATABASES = {
'default': {
'ENGINE': 'django.contrib.gis.db.backends.oracle',
'NAME': 'mydatabase',
'USER': 'mydatabaseuser',
'PASSWORD': 'mypassword',
'HOST': '127.0.0.1',
'PORT': '5432',
}
}
First you need to create a user and password in your database, Oracle and set up this information in setting.py
You can see more information here.
I am using mongoengine with Django and my project needs to connect to one instances of MongoDB while another with sql .How my databse section of setting.py should be like ?
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'admin_db',
'USER': 'root',
'PASSWORD': 'root',
'HOST': 'localhost',
},
}
from mongoengine import connect
connect(
db='pom',
username='admin',
password='root',
host='mongodb://admin:root#localhost'
)
You could add multiple databases for your app in your settings.py like,
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'admin_db',
'USER': 'root',
'PASSWORD': 'root',
'HOST': 'localhost',
},
'your_desired_db_name' : {
'ENGINE' : 'django_mongodb_engine',
'NAME' : 'db_name'
}
For integration with mongodb, you may need to look up,
Django-nonrel
Django-MongoEngine
Also, you may need to look up Django documentation for multiple databases
MongoEngine does not support all Django contrib modules directly. If your projects dont need them (unlikely) you can use mongoengine directly. Otherwise you can also try
djongo
Which seems to work fine with the latest Django version.
What I'am trying to do is to use 2 databases in my django app. One is to be accessed from a remote server. Django settings has something like this
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'snackvoxadmin'
},
'users': {
.....
}
}
The database user has a url like similar to this one: postgres://a78adj1he81....
You can decompose your database url and configure it like this:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'mydatabase',
'USER': 'mydatabaseuser',
'PASSWORD': 'mypassword',
'HOST': '127.0.0.1',
'PORT': '5432',
}
}
And the pattern for a database url is :
postgres://user:password#host:post/database
https://docs.djangoproject.com/en/1.8/ref/settings/#databases
Or you can use the package dj-database-url to directly use the database url.
E.g. from readme :
import dj_database_url
DATABASES = {'default': dj_database_url.parse('postgres://...')}
That URL presumably consists of a username, a password, and a host name/IP address. You could split them up yourself or use the dj-database-url library.