Python Django 缓存：集成缓存框架的全面指南

            CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
        'LOCATION': '127.0.0.1:11211',
    }
}

            

              
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            from django.core.cache import cache

# Set a value in the cache
cache.set('my_key', 'my_value', 300)  # Store for 300 seconds

# Get a value from the cache
value = cache.get('my_key')  # Returns 'my_value' if the key exists, otherwise None

# Delete a value from the cache
cache.delete('my_key') 

            

              
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            MIDDLEWARE = [
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.cache.FetchFromCacheMiddleware',
]

            

              
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            CACHE_MIDDLEWARE_ALIAS = 'default'
CACHE_MIDDLEWARE_SECONDS = 600  # Cache for 10 minutes

            

              
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            from django.views.decorators.cache import cache_page

@cache_page(60 * 15)  # Cache for 15 minutes
def my_view(request):
    # ...
    return render(request, 'my_template.html', {'data': data})

            

              
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            {% load cache %}

            

              
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            {% cache 500 sidebar %}
    <!-- Sidebar content -->
    <ul>
        {% for item in sidebar_items %}
            <li>{{ item.title }}</li>
        {% endfor %}
    </ul>
{% endcache %}

            

              
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            {% cache 500 sidebar item.id %}
    <!-- Sidebar content -->
    <ul>
        {% for item in sidebar_items %}
            <li>{{ item.title }}</li>
        {% endfor %}
    </ul>
{% endcache %}

            

              
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            {% load cache %}

<div class="news-article">
    <h2>{{ article.title }}</h2>
    <p>{{ article.content }}</p>
</div>

<div class="weather-forecast">
    <h3>Weather Forecast</h3>
    <p>{{ weather.temperature }}°C</p>
    <p>{{ weather.description }}</p>
</div>

{% cache 3600 stock_quotes %}
<div class="stock-quotes">
    <h3>Stock Quotes</h3>
    <ul>
        {% for quote in stock_quotes %}
        <li>{{ quote.symbol }}: {{ quote.price }}</li>
        {% endfor %}
    </ul>
</div>
{% endcache %}

            

              
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            from django.db.models.signals import post_save, post_delete
from django.dispatch import receiver
from django.core.cache import cache
from .models import Product

@receiver(post_save, sender=Product)
def product_saved(sender, instance, **kwargs):
    cache.delete('product_list')  # Invalidate the product list cache
    cache.delete(f'product_detail_{instance.id}') # invalidate the product detail cache

@receiver(post_delete, sender=Product)
def product_deleted(sender, instance, **kwargs):
    cache.delete('product_list')  # Invalidate the product list cache
    cache.delete(f'product_detail_{instance.id}') # invalidate the product detail cache

            

              
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            from django.core.cache import cache
from .models import Product

def get_products(category, price_range, availability):
    cache_key = f'products_{category}_{price_range}_{availability}'
    products = cache.get(cache_key)

    if products is None:
        products = Product.objects.filter(
            category=category,
            price__range=price_range,
            availability=availability
        )
        cache.set(cache_key, products, 3600)  # Cache for 1 hour

    return products

            

              
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