Django 缓存原理 与添加 redis 缓存
原理流程
#新建立 应用 stu
#修改settings.py,增加缓存配置
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'stu'
]
#末尾增加（内存缓存）：
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
}
}
CACHE_MIDDLEWARE_KEY_PREFIX = ''
CACHE_MIDDLEWARE_SECONDS = 600
CACHE_MIDDLEWARE_ALIAS = 'default'
#修改urls.py
url(r'^class/',include('stu.urls'))
#修改
stu/urls.py
#coding=utf-8
from django.conf.urls import url
import views
urlpatterns = [
url(r'^$',views.index_view)
]
#增加models.py
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models
# Create your models here.
class Clazz(models.Model):
cname = models.CharField(max_length=30,unique=True)
def __unicode__(self):
return u'Clazz:%s'%self.cname
#数据库新添两条数据
#修改 views.py
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.http import HttpResponse
from django.shortcuts import render
from .models import *
#导入 django 缓存包
from django.core.cache import caches
# Create your views here.
#获取缓存对象
cacheobj = caches['default']
def cache_view(fund):
def _wur(request,*args,**kwargs):
#path 为键，get 键后为内容 value
data = cacheobj.get(request.path)
if data:
print '读取缓存数据'
return HttpResponse(data)
else:
print '准备获取数据库数据'
response = fund(request,*args,**kwargs)
print '进行缓存数据'
cacheobj.set(request.path,response.content)
return response
return _wur
#添加装饰器
@cache_view
def index_view(request):
postList = Clazz.objects.all()
return render(request,'index.html',{'postList':postList})
#模板文件 index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
{% for i in postList %}
{{ i.cname }}<br>
{% endfor %}
</body>
</html>
效果如下： 访问 http://127.0.0.1:8000/class/，查看控制台
redis 缓存
# 修改settings.py 增加redis 缓存配置 ,127.0.0.1:6379/0 代表 redis 本地地址， 0 表示使用redis 0号库
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
},
'redis':{
"BACKEND": "django_redis.cache.RedisCache",
"LOCATION": "redis://127.0.0.1:6379/0",
}
}
CACHE_MIDDLEWARE_KEY_PREFIX = ''
CACHE_MIDDLEWARE_SECONDS = 600
CACHE_MIDDLEWARE_ALIAS = 'redis'
# 修改views.py 将 default 本地缓存改为 redis 缓存 cacheobj = caches['redis']
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.http import HttpResponse
from django.shortcuts import render
from .models import *
from django.core.cache import caches
# Create your views here.
#获取缓存对象
cacheobj = caches['redis']
print cacheobj
def cache_view(fund):
def _wur(request,*args,**kwargs):
data = cacheobj.get(request.path)
if data:
print '读取缓存数据'
return HttpResponse(data)
else:
print '准备获取数据库数据'
response = fund(request,*args,**kwargs)
print '进行缓存数据'
cacheobj.set(request.path,response.content)
return response
return _wur
@cache_view
def index_view(request):
postList = Clazz.objects.all()
print request.path
print request.method
return render(request,'index.html',{'postList':postList})
# 同样通过访问 http://127.0.0.1:8000/class/ 已经把 /class/ 以及页面结果插入到 redis 库中，截图显示, treenms是用来查看 redis 中 value 的软件
