Django 创建新App及其常用命令的实现方法

创建新的项目

django-admin.py startproject my_project

创建新的App

# 在Django项目(my_project)的根目录下执行
python3 manage.py startapp my_app

启动Django中的开发服务器

# make new migrations
python3 manage.py makemigrations
 
# apply all migrations
python3 manage.py migrate
 
# run server
python3 manage.py runserver

创建models

class App1(models.Model):
 
  title = models.CharField(max_length=100)
 
  category = models.CharField(max_length=50, blank=True)
 
  date_time = models.DateTimeField(auto_now_add=True)
 
  def __unicode__(self):
 
    return self.title
 
  class Meta:
 
    ordering = ['-date_time']

进入Django中的交互式shell

python3 manage.py shell
 
from app1.models import App1
 
# create(增加操作)
App1.objects.create(title="title",category='category1')
 
# all和get(查看操作)
App1.objects.all()
App1.objects.get(id=1)
 
# update(修改操作)
demo = App1.objects.get(id=1)
demo.title
demo.title="title2"
 
# delete(删除操作)
demo.delete()

创建一个超级用户

python3 manage.py createsuperuser
 
# 输入http://127.0.0.1:8000/admin登录后台

数据库信息的增加和删除，admin.py中增加代码

from article.models import App1
 
admin.site.register(App1)

Views和URL操作

# views.py
from django.http import HttpResponse
def home(request):
  return HttpResponse("Hello World, Django")
 
# urls.py
url(r'^$', 'app1.views.home')

URL传参

# views.py
def detail(request, number):
  return HttpResponse("The number is %s." % number)
 
# urls.py
url(r'^([0-9]+)/', 'app1.views.detail', name='detail')

URL传参查询数据库

# views.py
def database(request, args):
  post = App1.objects.all()[int(args)]
  str = ("title = %s, category = %s, date_time = %s" % (post.title, post.category, post.date_time))
  return HttpResponse(str)
 
# urls.py
url(r'^id/([0-9])+/', 'article.views.database', name='database'),

将代码上传到Github

# 在github中新建仓库django-blog
# 在项目根目录下执行
git init
git remote add Django
git@github.com:ybbz/django-blog.git
git add .
git status
git commit -m "django blog init"
git pull Django master && git push Django master

Error: That port is already in use.

ps aux | grep -i manage
kill -9 ****
python3 manage.py runserver

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