A review of the content of the previous section:
1. Django request life cycle
-> URL correspondence (matching) -> view function -> return user string
-> URL correspondence (matching) -> View function -> Open an HTML file and read the content
2. Create django projcet
django-admin startproject mysite
..
mysite
mysite
- Profile
- url.py
- settings.py
cd mysite
python manage.py startapp cmdb
mysite
mysite
- Profile
- url.py
- settings.py
cmdb
- views.py
- admin.py
- models.py # create database table
3. Configuration
template path
static file path
# CSRF
4. Write the program
a. url.py
/index/ -> func
b. views.py
def func(request):
# contains all request data
...
return HttpResponse('string')
return render(request, 'index.html', {''})
retrun redirect('URL')
c. Template language
return render(request, 'index.html', {'li': [11,22,33]})
{% for item in li %}
<h1>{{item}}</h1>
{% endfor %}
********** Dots for indexing **********
<h2> {{item.0 }} </h2>
1. Routing system, URL
1、url(r'^index/', views.index),
url(r'^home/', views.Home.as_view()),
2、url(r'^detail-(\d+).html', views.detail),
3、url(r'^detail-(?P<nid>\d+)-(?P<uid>\d+).html', views.detail)
PS:
def detail(request, *args,**kwargs):
pass
Actual combat:
a.
url(r'^detail-(\d+)-(\d+).html', views.detail),
def func(request, nid, uid):
pass
def func(request, *args):
args = (2,9)
def func(request, *args, **kwargs):
args = (2,9)
b.
url(r'^detail-(?P<nid>\d+)-(?P<uid>\d+).html', views.detail)
def func(request, nid, uid):
pass
def funct(request, **kwargs):
kwargs = {'not': 1, 'uid': 3}
def func(request, *args, **kwargs):
args = (2,9)
4、 name
Name the URL routing relationship, ***** You can generate the URL you want based on this name in the future *****
url(r'^asdfasdfasdf/', views.index, name='i1'),
url(r'^yug/(\d+)/(\d+)/', views.index, name='i2'),
url(r'^buy/(?P<pid>\d+)/(?P<nid>\d+)/', views.index, name='i3'),
#Reverse the generated url
def func(request, *args, **kwargs):
from django.urls import reverse
url1 = reverse('i1') # asdfasdfasdf/
url2 = reverse('i2', args=(1,2,)) # yug/1/2/
url3 = reverse('i3', kwargs={'pid': 1, "nid": 9}) # buy/1/9/
xxx.html
{% url "i1" %} # asdfasdfasdf/
{% url "i2" 1 2 %} # yug/1/2/
{% url "i3" pid=1 nid=9 %} # buy/1/9/
Note:
# current URL
request.path_info
5. Multi-level routing
project/urls.py
from django.conf.urls import url,include
from django.contrib import admin
urlpatterns = [
url(r'^cmdb/', include("app01.urls")),
url(r'^monitor/', include("app02.urls")),
]
app01/urls.py
from django.conf.urls import url,include
from django.contrib import admin
from app01 import views
urlpatterns = [
url(r'^login/', views.login),
]
app02/urls.py
from django.conf.urls import url,include
from django.contrib import admin
from app02 import views
urlpatterns = [
url(r'^login/', views.login),
]
6. Default value (owing)
7. Namespaces (owe)
2. View
1. Get user request data
request.GET
request.POST
request.FILES
PS:
GET: get data
POST: submit data
2. Multi-selected content such as checkboxes
request.POST.getlist()
3. Upload files
# Upload files, make special settings for the form tag
obj = request.FILES.get ('delete')
obj.name
f = open(obj.name, mode='wb')
for item in obj.chunks():
f.write(item)
f.close()
4、FBV & CBV
function base view
url.py
index -> function name
view.py
def function(request):
...
====》
/index/ -> function name
/index/ -> class
====》
Recommendation: use both
5. Decorator
owe
3. Template
Fourth, ORM operation
select * from tb where id > 1
# Correspondence
models.tb.objects.filter(id__gt=1)
models.tb.objects.filter(id=1)
models.tb.objects.filter(id__lt=1)
create class
a. Write the class first
from django.db import models
# app01_userinfo
class UserInfo(models.Model):
# id column, auto increment, primary key
# Username column, string type, specified length
username = models.CharField(max_length=32)
password = models.CharField(max_length=64)
b. Importing the module in the views is effective, so you need to register the APP
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'app01',
]
Then after writing the data class in the models of the app, you need to run the following command to create the table
c. Execute the command
python manage.py makemigrations
python manage.py migrate
d. ********** NOTE***********
Django uses the MySQLdb module to link MySQL by default
Actively modify it to pymysql, and add the following code to the __init__ file in the project folder with the same name:
import pymysql
pymysql.install_as_MySQLdb()
1. Automatically create database tables based on classes
# models.py under app
python manage.py makemigrations
python manage.py migrate
Field:
String type
number
time
binary
自增models.AutoField（primary_key=True）
Field parameters:
null -> can db be nullable
default -> default value
primary_key -> primary key
db_column -> column name
db_index -> index
unique -> unique index
unique_for_date ->
unique_for_month
unique_for_year
auto_now -> when created, the time is automatically generated
auto_now_add -> When updating, automatically update to the current time
# obj = UserGroup.objects.filter(id=1).update(caption='CEO')
# obj = UserGroup.objects.filter(id=1).first()
# obj.caption = "CEO"
# obj.save()
choices -> Display a drop-down box in django admin to avoid connecting table queries
user_choices = (
(1, superuser),
(2, ordinary users),
(3, low-level users),
)
user_type_id = models.IntegerField(choices = user_choices,default= 1)
blank -> can django admin be blank
verbose_name -> django admin display field Chinese
editable -> whether django admin can be edited
error_messages -> error messages due
help_text -> django admin prompt
validators -> django form , custom error message (owes)
Create a Django superuser: python manage.py createsuperuser
2. Perform various operations on the data in the database table according to the class
One-to-many:
a. External inspection
b.
foreign key field _id
c.
models.tb.object.create(name='root', user_group_id=1)
d.
userlist = models.tb.object.all()
for row in userlist:
row.id
row.user_group_id
row.user_group.caption
==================== Assignment: User Management ======================
1. Add, delete, modify and check user groups
2. Users add or delete the query
- add must be dialog
- delete must be a dialog
- Modified, must show default value
3. Better looking pages
4. Preview:
http://www.cnblogs.com/wupeiqi/articles/5246483.html