Writing your first Django app--2017年5月9日 _writing

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Writing your first Django app, part 1
requriments : Django 1.8 and python 2.7
【Writing your first Django app--2017年5月9日】创建项目django-admin startproject mysite
.
├── manage.py 命令行呢功能
└── mysite项目的python包
├── __init__.py告诉python这个目录是个python包
├── settings.py 配置文件
├── urls.py 支持的url
└── wsgi.py兼容WSGI的web服务的进入点
更改数据库在settings文件中更改DATABASES
建表python manage.py migrate
创建app python manage.py startapp polls
python manage.py sqlmigrate polls 000
sqlmigrate命令实际上并不在数据库上运行迁移，它只是打印到屏幕上，是用于检查Django要做什么。
如果更改了model，即需要更新表
python manage.py makemigrations ： create migrations for those changes
python manage.py migrate：apply those changes to the database.
python manage.py shell
manage.py 设置了 DJANGO_SETTINGS_MODULE 环境变量，which gives Django the Python import path to your mysite/settings.py file.

# mysite/polls/models.py from django.db import models import datetime from django.utils import timezone# Create your models here.class Question(models.Model): question_text = models.CharField(max_length=200) pub_date = models.DateTimeField(‘date published‘)def __str__(self): return self.question_textdef was_published_recently(self): return self.pub_date > = timezone.now() - datetime.timedelta(days=1)class Choice(models.Model): question = models.ForeignKey(Question) choice_text = models.CharField(max_length=200) votes = models.IntegerField(default=0)def __str__(self): return self.choice_text

Writing your first Django app, part 2