What is Django transaction management?

Question

Accepted Answer

**Django transactions** ensure **data integrity** with atomic operations.

```python
from django.db import transaction

# Atomic block
@transaction.atomic
def transfer_money(from_account, to_account, amount):
    from_account.balance -= amount
    from_account.save()

to_account.balance += amount
    to_account.save()
    # If any error, both operations are rolled back

# Manual atomic block
with transaction.atomic():
    user = User.objects.create(name="Alice")
    profile = Profile.objects.create(user=user)
    # Both succeed or both fail

# Savepoints
with transaction.atomic():
    user = User.objects.create(name="Alice")

with transaction.atomic():
        # Savepoint
        profile = Profile.objects.create(user=user)
        # If this fails, only profile is rolled back

# Using in views
from django.db import transaction

@transaction.atomic
def my_view(request):
    # Entire view is atomic
    pass

# Select for update (locking)
with transaction.atomic():
    user = User.objects.select_for_update().get(id=1)
    user.balance += 100
    user.save()
```

**When to use:**
- Multiple related operations.
- Financial transactions.
- Data consistency requirements.

Python: What is Django transaction management?