如何在Django视图中存储全局变量

# settings.py
MY_GLOBAL_VARIABLE = 'Hello, World!'

from django.conf import settings

def my_view(request):
    global_var = settings.MY_GLOBAL_VARIABLE
    # 使用global_var

from django.core.cache import cache

def set_global_variable(key, value):
    cache.set(key, value)

def get_global_variable(key):
    return cache.get(key)

def my_view(request):
    set_global_variable('my_key', 'Hello, World!')
    global_var = get_global_variable('my_key')
    # 使用global_var

# models.py
from django.db import models

class GlobalVariable(models.Model):
    key = models.CharField(max_length=255, unique=True)
    value = models.TextField()

# 在视图中使用
from .models import GlobalVariable

def set_global_variable(key, value):
    GlobalVariable.objects.update_or_create(key=key, defaults={'value': value})

def get_global_variable(key):
    try:
        return GlobalVariable.objects.get(key=key).value
    except GlobalVariable.DoesNotExist:
        return None

def my_view(request):
    set_global_variable('my_key', 'Hello, World!')
    global_var = get_global_variable('my_key')
    # 使用global_var

# middleware.py
class GlobalVariableMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        request.my_global_variable = 'Hello, World!'
        response = self.get_response(request)
        return response

def my_view(request):
    global_var = request.my_global_variable
    # 使用global_var