pre_init                        # Django中的model对象执行其构造方法前,自动触发
post_init                       # Django中的model对象执行其构造方法后,自动触发
pre_save                        # Django中的model对象保存前,自动触发
post_save                       # Django中的model对象保存后,自动触发
pre_delete                      # Django中的model对象删除前,自动触发
post_delete                     # Django中的model对象删除后,自动触发
m2m_changed                     # Django中的model对象使用m2m字段操作数据库的第三张表(add,remove,clear,update),自动触发
class_prepared                  # 程序启动时,检测到已注册的model类,对于每一个类,自动触发

pre_migrate                     # 执行migrate命令前,自动触发
post_migrate                    # 执行migrate命令后,自动触发 

request_started                 # 请求到来前,自动触发
request_finished                # 请求结束后,自动触发
got_request_exception           # 请求异常时,自动触发

setting_changed                 # 配置文件改变时,自动触发
template_rendered               # 模板执行渲染操作时,自动触发

connection_created              # 创建数据库连接时,自动触发

from django.db import modelsclass UserInfo(models.Model):name=models.CharField(max_length=32)pwd=models.CharField(max_length=64)

from django.shortcuts import render,HttpResponse
from app01 import  modelsdef index(request):models.UserInfo.objects.create(name="mysql",pwd="mysql123")return HttpResponse("ok")

from django.db.models.signals import pre_save,post_savedef pre_save_func(sender,**kwargs):print("pre_save_func")print("pre_save_msg:",sender,kwargs)def post_save_func(sender,**kwargs):print("post_save_func")print("post_save_msg:",sender,kwargs)pre_save.connect(pre_save_func)             # models对象保存前触发callback函数
post_save.connect(post_save_func)           # models对象保存后触发函数

pre_save_func
pre_save_msg: <class 'app01.models.UserInfo'> {'signal': <django.db.models.signals.ModelSignal object at 0x0000000002E62588>,
'instance': <UserInfo: UserInfo object>, 'raw': False, 'using': 'default', 'update_fields': None}post_save_func
post_save_msg: <class 'app01.models.UserInfo'> {'signal': <django.db.models.signals.ModelSignal object at 0x0000000002E62630>,
'instance': <UserInfo: UserInfo object>, 'created': True, 'update_fields': None, 'raw': False, 'using': 'default'}

from django.core.signals import request_finished
from django.dispatch import receiver@receiver(request_finished)
def callback(sender, **kwargs):print("Request finished!")

import django.dispatchaction=django.dispatch.Signal(providing_args=["aaaa","bbbb"])

from singal_test import actiondef pre_save_func(sender,**kwargs):print("pre_save_func")print("pre_save_msg:",sender,kwargs)action.connect(pre_save_func)

from singal_test import actionaction.send(sender="python",aaa="111",bbb="222")

pre_save_func
pre_save_msg: python {'signal': <django.dispatch.dispatcher.Signal object at 0x000000000391D710>, 'aaa': '111', 'bbb': '222'}