Fixed #29864 -- Added link targets for low-level cache API.

This commit is contained in:
Prabakaran Kumaresshan 2018-10-26 22:24:01 +05:30 committed by Tim Graham
parent 26bb2611a5
commit 8250538bfc
2 changed files with 31 additions and 6 deletions

View File

@ -115,8 +115,8 @@ Cache
* The :ref:`local-memory cache backend <local-memory-caching>` now uses a
least-recently-used (LRU) culling strategy rather than a pseudo-random one.
* The new ``touch()`` method of the :ref:`low-level cache API
<low-level-cache-api>` updates the timeout of cache keys.
* The new :meth:`~django.core.caches.cache.touch` method of the :ref:`low-level
cache API <low-level-cache-api>` updates the timeout of cache keys.
CSRF
~~~~

View File

@ -788,9 +788,16 @@ Accessing the cache
Basic usage
-----------
The basic interface is ``set(key, value, timeout)`` and ``get(key)``::
.. currentmodule:: django.core.caches
The basic interface is:
.. method:: cache.set(key, value, timeout=DEFAULT_TIMEOUT, version=None)
>>> cache.set('my_key', 'hello, world!', 30)
.. method:: cache.get(key, default=None, version=None)
>>> cache.get('my_key')
'hello, world!'
@ -818,6 +825,8 @@ return if the object doesn't exist in the cache::
>>> cache.get('my_key', 'has expired')
'has expired'
.. method:: cache.add(key, value, timeout=DEFAULT_TIMEOUT, version=None)
To add a key only if it doesn't already exist, use the ``add()`` method.
It takes the same parameters as ``set()``, but it will not attempt to
update the cache if the key specified is already present::
@ -831,6 +840,8 @@ If you need to know whether ``add()`` stored a value in the cache, you can
check the return value. It will return ``True`` if the value was stored,
``False`` otherwise.
.. method:: cache.get_or_set(key, default, timeout=DEFAULT_TIMEOUT, version=None)
If you want to get a key's value or set a value if the key isn't in the cache,
there is the ``get_or_set()`` method. It takes the same parameters as ``get()``
but the default is set as the new cache value for that key, rather than simply
@ -846,6 +857,8 @@ You can also pass any callable as a *default* value::
>>> cache.get_or_set('some-timestamp-key', datetime.datetime.now)
datetime.datetime(2014, 12, 11, 0, 15, 49, 457920)
.. method:: cache.get_many(keys, version=None)
There's also a ``get_many()`` interface that only hits the cache once.
``get_many()`` returns a dictionary with all the keys you asked for that
actually exist in the cache (and haven't expired)::
@ -856,6 +869,8 @@ actually exist in the cache (and haven't expired)::
>>> cache.get_many(['a', 'b', 'c'])
{'a': 1, 'b': 2, 'c': 3}
.. method:: cache.set_many(dict, timeout)
To set multiple values more efficiently, use ``set_many()`` to pass a dictionary
of key-value pairs::
@ -868,22 +883,32 @@ Like ``cache.set()``, ``set_many()`` takes an optional ``timeout`` parameter.
On supported backends (memcached), ``set_many()`` returns a list of keys that
failed to be inserted.
.. method:: cache.delete(key, version=None)
You can delete keys explicitly with ``delete()``. This is an easy way of
clearing the cache for a particular object::
>>> cache.delete('a')
.. method:: cache.delete_many(keys, version=None)
If you want to clear a bunch of keys at once, ``delete_many()`` can take a list
of keys to be cleared::
>>> cache.delete_many(['a', 'b', 'c'])
.. method:: cache.clear()
Finally, if you want to delete all the keys in the cache, use
``cache.clear()``. Be careful with this; ``clear()`` will remove *everything*
from the cache, not just the keys set by your application. ::
>>> cache.clear()
.. method:: cache.touch(key, timeout=DEFAULT_TIMEOUT, version=None)
.. versionadded:: 2.1
``cache.touch()`` sets a new expiration for a key. For example, to update a key
to expire 10 seconds from now::
@ -896,9 +921,8 @@ Like other methods, the ``timeout`` argument is optional and defaults to the
``touch()`` returns ``True`` if the key was successfully touched, ``False``
otherwise.
.. versionchanged:: 2.1
The ``cache.touch()`` method was added.
.. method:: cache.incr(key, delta=1, version=None)
.. method:: cache.decr(key, delta=1, version=None)
You can also increment or decrement a key that already exists using the
``incr()`` or ``decr()`` methods, respectively. By default, the existing cache
@ -925,6 +949,7 @@ nonexistent cache key.::
However, if the backend doesn't natively provide an increment/decrement
operation, it will be implemented using a two-step retrieve/update.
.. method:: cache.close()
You can close the connection to your cache with ``close()`` if implemented by
the cache backend.