i am making a cache db using the django cache module i configured it in my settings.py like this
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
'LOCATION': 'my_cache_table',
}
}
so in my something.py file example
def function():
log=cache['default']
log["cal"]+=1
can i do this so that a variable like cal would be formed and it would increase every time i call that function
First, you need to make sure the cache table exists in your database. Django provides a management command for this:
python3 manage.py createcachetable
Now to increment cal:
# a convenience import for the default cache
from django.core.cache import cache
def increment_cal():
cal = cache.get_or_set('cal', 0)
cal += 1
cache.set('cal', cal)
There is only one problem, this code has a race condition. If multiple threads try to increment cal at the same time, you can get inaccurate results.
To fix this, you will need a thread lock:
import threading
from django.core.cache import cache
cal_lock = threading.Lock()
def increment_cal():
with cal_lock:
cal = cache.get_or_set('cal', 0)
cal += 1
cache.set('cal', cal)
Note that this only solves race conditions between threads. If you have multiple processes trying to increment cal, you will need to use a multiprocessing lock instead.
cache.get('cal')