Django Academy · 课时

缓存后端与 Redis

配置生产环境缓存后端

缓存后端与 Redis 是 CoddyKit 上的免费 Django Academy 课时。这是第 1 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Django Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Django Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

What a Cache Saves You

A cache stores expensive results so the next request can skip the slow work and reply almost instantly. ⚡

Where Caches Live

Django talks to a cache through a backend, a pluggable adapter that decides where your cached data is physically stored.

The CACHES Setting

You configure caching in the CACHES dict in settings.py, always with a key named default that Django reads first.

CACHES = {
    "default": {
        "BACKEND": "django.core.cache.backends.locmem.LocMemCache",
    }
}

Local Memory for Dev

The default LocMemCache keeps data in your process memory. It is fine for development but is not shared across servers.

Why Redis in Production

For real apps, point the backend at Redis, a fast in-memory store that many web servers can share at once.

Configuring the Redis Backend

Set BACKEND to RedisCache and give it a LOCATION pointing at your Redis server URL.

CACHES = {
    "default": {
        "BACKEND": "django.core.cache.backends.redis.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379",
    }
}

Talking to the Cache

Import the shared cache object from django.core.cache to read and write values from anywhere in your code.

from django.core.cache import cache

set and get

Use set to store a value under a key, then get to read it back later in another request.

cache.set("answer", 42)
value = cache.get("answer")

Timeouts Keep Data Fresh

The third argument to set is a timeout in seconds. After it passes, the key expires and get returns None.

cache.set("answer", 42, 300)

Handling Cache Misses

A missing key is a cache miss. Pass a default to get so your code has a safe value to fall back on.

value = cache.get("answer", "none yet")

Other Backends Exist

Beyond Redis, Django ships database and file-based backends, handy when you cannot run a separate memory server.

Quick Check

Time to confirm where production caches usually live.

Recap

You met the cache backend: configure CACHES, use LocMem in dev and Redis in production, then set and get values with a timeout. 🎉

常见问题解答

「缓存后端与 Redis」课时是免费的吗？

是的 — 「缓存后端与 Redis」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Django Academy 课程的其余内容，请升级到 CoddyKit PRO。 Django Academy 课程共包含 4 节课。

「缓存后端与 Redis」这节课中我会学到什么？

配置生产环境缓存后端你通过在浏览器中直接运行的动手代码来练习 Django Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Django Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Django Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 1 节课，共 4 节。

「缓存后端与 Redis」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Django Academy 课中编写并运行代码吗？

能。每节 Django Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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