Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. Developed by a team of experienced web developers, Django simplifies and eases the processes of developing complex, data-driven websites, focusing on automating as much as possible and adhering to the DRY principle (Don’t Repeat Yourself).
Regarding “isolation level,” it appears there might be some confusion. It typically refers to the ‘transaction isolation level’ in databases. The term applies to the Django framework in the context of how Django interacts with databases.
In the world of databases, the isolation level of a transaction corresponds to the extent to which a transaction is isolated from other transactions in the system. A transaction is a sequence of one or more database operations, executed as a single, atomic work unit. Several transactions can run concurrently on the same database, and the isolation level plays a vital part in determining the transaction behaviour in such scenarios.
Python Django standing out for its holistic and pluggable approach in handling databases, provides an exquisite Database API to handle these transactions. According to the Django Documentation, Django provides several ways to control transaction management. By default, Django opens a transaction for each HTTP request. This transaction is committed if no exceptions are raised in the view (a single function that produces an HTTP response). If the view does produce an exception, then Django rolls back the transaction.
For example, consider a Python Django interaction with an SQL database, where multiple read and write operations take place. With the help of Django’s database transaction management, one could set the isolation level and define how these operations are executed in an isolated environment.
When specifying the Django DATABASE setting, one can use the OPTIONS key to determine the isolation level of the database transactions. For example, the snippet below sets the isolation level to ‘READ COMMITTED’ on a PostgreSQL database.
```
DATABASES = {
‘default’: {
‘ENGINE’: ‘django.db.backends.postgresql_psycopg2’,
‘NAME’: ‘mydatabase’,
‘USER’: ‘mydatabaseuser’,
‘PASSWORD’: ‘mypassword’,
‘HOST’: ‘localhost’,
‘PORT’: ‘’,
‘OPTIONS’: {
‘isolation_level’: psycopg2.extensions.ISOLATION_LEVEL_SERIALIZABLE,
},
},
}
```
References used for the response are Python and Django Documentation, which are reputable and recognized sources for the respective languages and frameworks.
Sources:
1. Django Documentation: https://docs.djangoproject.com/
2. Python Documentation: https://docs.python.org/3/library/sqlite3.html#controlling-transactions
3. PostgreSQL Documentation: https://www.postgresql.org/docs/9.1/transaction-iso.html
4. Django: The Web framework for perfectionists with deadlines: https://www.djangoproject.com/
