Django框架

#创建项目mydemo
django-admin startproject mydemo2
#进入mydemo文件
cd mydemo
dir
#创建一个myapp项目
python manage.py startapp myapp
# 启动项目
python manage.py runserver

1、进入Navicat,创建一个数据库mytest2,
2、通过执行表迁移创建数据库表
2.1 执行数据库的连接配置，网站配置
编辑mydemo2/mydemo2/settings.py文件

	# *允许其他地址可以访问。
	ALLOWED_HOSTS = ['*']
#添加自己的应用myapp
	INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'myapp',
]

#配置模板路径信息

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(base_DIR,'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

#数据库的连接

DATAbaseS = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'mytest',
        'USER': 'root',
        'PASSWORD': '125358',
        'HOST': 'localhost',
        'PORT': '3306',
}

from django.db import models
from datetime import datetime
# Create your models here.


class Users(models.Model):
    #id = models.AutoField(primary_key=True) #主键可省略不写
    name = models.CharField(max_length=32)
    age = models.IntegerField(default=20)
    phone = models.CharField(max_length=16)
    		  addtime=models.DateTimeField(default=datetime.now)

 

    # 自定义对应的表名，默认表名：myapp_users
#class meta:
    #db_table="myapp_users"

python3 manage.py makemigrations

python manage.py migrate

此时数据库中会有一张表，并且有字段

from django.shortcuts import render
from django.http import HttpResponse
# Create your views here.
def index(request):
    return HttpResponse('首页')

在总urls.py中

from django.contrib import admin
from django.urls import path,include

urlpatterns = [
    #path('admin/', admin.site.urls),
    path("",include('myapp.urls'))
]

在myapp下创建子路由urls.py

from django.urls import path
from . import views
urlpatterns = [
    
    path("",views.index,name='index'),
]

在命令窗口启动服务，可以看到如下界面

from django.shortcuts import render
from django.http import HttpResponse
from myapp.models import Users
# Create your views here.
def index(request):
    #执行Model的操作

    #添加操作
    # ob = Users()
    # ob.name='李四'
    # ob.age= 18
    # ob.phone='1256'
    # ob.save()

    #删除操作
    # mod = Users.objects#获取Users的model对象
    # user = mod.get(id=6)#获取id=6的数据信息
    # print(user.name)
    # user.delete()

    #修改操作
    # ob = Users.objects.get(id=2)
    # print(ob.name)
    # ob.name = 'zhang'
    # ob.age=23
    # ob.save()

    #查询数据
    mod = Users.objects#获取Users模型的Model操作对象
    #ulist = mod.all()#获取所有数据
    #ulist = mod.filter(name='浓浓')#获取name=‘浓浓’的信息
    # ulist = mod.filter(age__gt=20)#年龄大于 20
    # ulist = mod.filter(age__gte=20)#年龄大于等于 20
    # ulist = mod.filter(age__lte=20)#年龄小于等于20
    #ulist = mod.order_by('age')#按年龄升序
    ulist = mod.order_by('age')[:3]
    for u in ulist:
        print(u.id,u.name,u.age)
    return HttpResponse('首页')

参考：https://www.bilibili.com/video/BV1pq4y1W7a1?p=10