老男孩S16期的Django笔记（二）

day59-002 内容回顾.mp4

urls.py

点击查看代码

from django.conf.urls import url
from django.contrib import admin
from django.shortcuts import render


# day59-002 内容回顾
def login(request):
    return render(request, 'login.html')

urlpatterns = [
    url(r'^login/$', login),

    # url(r'^index/$', index),
]

settings.py

点击查看代码

"""
Django settings for mysite project.

Generated by 'django-admin startproject' using Django 1.11.11.

For more information on this file, see
https://docs.djangoproject.com/en/1.11/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/1.11/ref/settings/
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'i(jw%dl9a%cfxca5$5rb(1)1()$w*me4c+^or$@bxbs2el*v2e'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

# 我这个项目有哪些app
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'app01.apps.App01Config',  # 告诉Django我自己新建了一个名叫app01的应用
    # 'app01'
]

# 中间件相关的配置
MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    # 'django.middleware.csrf.CsrfViewMiddleware',  # 大概在两周之后会讲（@肖锋老师）
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'mysite.urls'

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',
            ],
        },
    },
]

WSGI_APPLICATION = 'mysite.wsgi.application'


# Database
# https://docs.djangoproject.com/en/1.11/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

# DATABASES = {
#     'default': {
#         'ENGINE': 'django.db.backends.mysql',  # 连接数据库的类型
#         'NAME': 'mysite',  # 数据库名
#         'HOST': '127.0.0.1',  # 数据库主机地址
#         'PORT': 3306,  # 数据库的端口
#         'USER': 'root',
#         'PASSWORD': '',
#     }
# }


# Password validation
# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/1.11/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.11/howto/static-files/

# 静态文件相关
STATIC_URL = '/static/'
# 静态资源文件的实际存放目录
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, 'static'),
]


# python manage.py runserver 127.0.0.1:8000

day59-003 登录示例.mp4

预期功能：当点击登录表单的提交按钮后，页面访问url为/yingying/ 请求方法POST ，页面回显“可以”字符串（无样式），controller层的方法定义在views.py文件。

1. form表单提交数据的三个要素
1. form标签必须要有action和method属性
2. 所有获取用户输入的标签必须放在form表单中，必须要有name属性
3. 必须要有submit按钮

表单页面文件修改action

            <form class="form-horizontal" action="/yingying/" method="post">

views.py

from django.shortcuts import render, HttpResponse

# day59-003  登录示例
def login(request):
    return render(request, 'login.html')

def yingying(request):
    return HttpResponse('可以')

urls.py

from django.conf.urls import url
from django.contrib import admin
from django.shortcuts import render
from . import views


# day59-003  登录示例
urlpatterns = [
    url(r'^login/$', views.login),
    url(r'^yingying/$',views.yingying)
]

2. Django 基础必会三件套
from django.shortcuts import HttpResponse, render, redirect
1. HttpResponse
返回一个指定的字符串时
2. render
返回一个HTML文件
3. redirect
跳转
3. request相关的属性
1. request.method --> 返回的是请求的方法（全大写）：GET/POST ...
2. request.GET --> 取得是URL里面的参数，类似于字典的数据结构
3. request.POST --> post提交的数据，类似于字典的数据结构

返回一个302重定向页面跳转

views.py

from django.shortcuts import render, HttpResponse, redirect

# day59-003  登录示例
def login(request):
    return render(request, 'login.html')

def yingying(request):
    #控制台打印一下
    # print(request.POST)
    email = request.POST.get('email')
    pwd = request.POST.get('pwd')
    print(email, pwd)
    if email == '1@1.com' and pwd =='123':
        # 登陆成功
        # 重定向到我的CSDN博客
        return redirect('https://blog.csdn.net/qq_40993412')
    else:
        # 登陆失败
        # 提示用户账号或密码错误
        pass

    return HttpResponse('可以')

4. Django的模板语言
{{ 变量名 }}

6. Django项目app --> 项目中又分了一级Python包,不同的功能放到不同的包里面
1. 创建app
python manage.py startapp app01
2. 告诉Django创建了一个app
在settings.py找那个的INSTALLED_APPS中添加新创建的app

命令行创建package存放views.py

python manage.py startapp app01

在settings.py找那个INSTALLED_APPS中添加

使用ORM框架操作SQL数据库

1. 手动创建一个数据库可用连接

2. 告诉Django连哪个数据库
DATABASES = {
'default': {

点击查看代码

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',  # 连接数据库的类型
        'NAME': 'mysite',  # 数据库名
        'HOST': '127.0.0.1',  # 数据库主机地址
        'PORT': 3306,  # 数据库的端口
        'USER': 'root',
        'PASSWORD': '',
    }
}

https://www.cnblogs.com/chenyuebai/p/7821996.html

python3.6 mysql:5.7 pymysql:0.7.11

pip install pymysql==0.7.11 -i https://pypi.tuna.tsinghua.edu.cn/simple


pip install mysqlclient==1.3.14 -i https://pypi.tuna.tsinghua.edu.cn/simple

3. 用什么连数据库？
利用第三方的包，比如第三方包：pymysql和MySQLdb
告诉Django用pymysql模块代替默认的MySQLdb去连接MySQL数据库
和settings.py同级的__init__.py文件，写上：
import pymysql
pymysql.install_as_MySQLdb()

__init__.py

import pymysql

pymysql.install_as_MySQLdb()

4. 在app/models.py的文件中创建类
类必须继承models.Model

5. 另外两个命令
1. python manage.py makemigrations --> 找个小本本把models.py的变更记录一下
2. python manage.py migrate --database=mysql --> 把上面的变更记录翻译成SQL语句，去数据库执行

从数据库里查询获取email和pwd的值

from app01.models import User

# day59-003  登录示例
def login(request):

    error_msg = ''
    #需要判断
    if request.method == 'POST':
        # 如果是第二次来，表示填完了要给我发数据了   ---> POST
        email = request.POST.get('email')
        pwd = request.POST.get('pwd')
        print(email, pwd)
        # if email == '1@1.com' and pwd =='123':
        ret = User.objects.filter(email = email , pwd=pwd)
        if ret:
            # 登陆成功

ssh连接服务器，进入mysql命令行

mysql -u root -p

参考资料：

https://www.cnblogs.com/zijiyanxi/p/7599052.html

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