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2/20
Install
Install Python Set up a database Install Django
tar xzvf Django-NNN.tar.gz sudo python setup.py install
http://docs.djangoproject.com/en/dev/intro/install
3/20
Writing your first Django app
import django django-admin.py startproject mysite
mysite/ __init__.py manage.py 对 Django进行脚本管理 settings.py 项目配置 urls.py URL分配器配置
python manage.py runserver 启动开发服务器 wget -O- -q http://127.0.0.1:8000/ 测试服务器 python manage.py runserver 192.168.128.141:80
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Database setup
vim settings.py 'ENGINE': 'django.db.backends.sqlite3‘ ‘NAME’:’mysite’
python manage.py syncdb
5/20
Creating models python manage.py startapp polls 创建 app Vim polls/models.py
继承 django.db models.Model实现对应的配置接口
6/20
TIPS
Projects vs. apps A project can contain multiple apps. An app can be in multiple projects.
Philosophy A model is the single, definitive source of data about your
data. It contains the essential fields and behaviors of the data
you're storing. Django follows the DRY Principle. The goal is to define your data model in one place and
automatically derive things from it.
7/20
Activating models
Create a database schema (CREATE TABLE statements) for this app.
Create a Python database-access API for accessing Poll and Choice objects.
settings.py: INSTALLED_APPS 加上 'mysite.polls'
python manage.py sql polls python manage.py syncdb
8/20
Other cmds on DB
python manage.py sql polls 建立模型 python manage.py validate 验证models错误 python manage.py sqlcustom polls 自定义 SQL python manage.py sqlindexes polls 建立索引
SQL python manage.py sqlall polls 全部 sql
,sqlcustom, 和 sqlindexes python manage.py dbshell 数据库控制台
9/20
Playing with the API
python manage.py shell 自动导入 mysite环境
Poll.objects.all() …
10/20
Activate the admin site
INSTALLED_APPS: ‘django.contrib.admin’ python manage.py syncdb 新 APP更新 DB vim urls.py 建立 url映射 python manage.py runserver开启服务器 manage.py createsuperuser 创建新用户 [polls]# vim admin.py 在 polls添加 admin.py
from mysite.polls.models import Poll from django.contrib import admin
admin.site.register(Poll)
…more admin ops
11/20
View
Views in Poll ‘archive’ page ‘detail’ page ‘results’ page Vote action
In Django, each view is a py function
12/20
Design URLs
Settings: ROOT_URLCONF = ‘mysite.urls’ 表示 mysite/urls.py
Find variable named urlpatterns in ROOT_URLCONF (regular expression, Python callback function [, optional dictionary])
Example: (r'^polls/(?P<poll_id>\d+)/$', 'mysite.polls.views.detail'),
(?P<poll_id>) 定义一个命名组； (?P=name) 则是对命名组的逆向引用
\d+ 对应的正则表达式 /polls/23/
detail(request=<HttpRequest object>, poll_id=‘23’ ) Note ： Django Will not search GET and POST parameters
13/20
First View
t = loader.get_template('polls/index.html') c = Context({ 'latest_poll_list':
latest_poll_list, }) HttpResponse(t.render(c)) A shortcut:
render_to_response(strTemplate ， dicContext) PBL ： ObjectDoesNotExist 为什么替换为
Http404
14/20
Use the template system
The Django template language http://docs.djangoproject.com/en/dev/topics/
templates/#topics-templates
15/20
Decoupling the URLconfs
cp urls.py polls/ 去掉 ^polls/的部分和 admin的部分
16/20
POST GET
request.POST['choice'] request.GET '/polls/3/results/' ==
reverse(‘mysite.polls.views.results’, args=(p.id,) )
Model的自动转化
插入对象 mtable =MainTable(word_number="12.250") mtable.save() #此刻 word_number会转化成
12.250存储到数据库中 Python中除了 '' 、 "" 、 0 、 () 、 [] 、 {} 、
None 为 False之外，其他的都是 True。
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PBL——Model
Model建立的流程是怎样的呢？ Model映射到数据库表时，如何处理外键？ Model中的数据只能是基本的数据库类型么？ Model按照数据库类型来声明会约束其应用么？会有不方便么？
我们项目如何在其之上开发出 Graph Database的应用？ 如果仅仅使用映射表动态添加属性，性能会怎样？ 常用的场景和操作有哪些？
全部属性检索 单个属性检索 组合属性检索
Django如何支持表连接操作？
19/20
PBL——View
怎样获取 Get 和 Post 怎样使用 Session 和 Cookie
20/20
PBL——Template
模板语言怎样使用？ 循环，分支 安全性：跨站，注入？
21/20
PBL——Python语言
Meta-Programming
22/20
Thank you!
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