一、实现：增、删、改、查
1、获取所有数据显示在页面上
model.Classes.object.all()，拿到数据后，渲染给前端;前端通过for循环的方式，取出数据。
目的：通过classes（班级表数据库）里面的字段拿到对应的数据。
2、添加功能
配置url分发路由增加一个add_classes.html页面
写一个def add_classess函数
在前端写一个a标签，前端页面就可以看到一个添加链接，通过点这个a标签的链接跳转到一个新的add_classess页面
add_classess.html 页面中实现两个功能：
form表单 ：返回给add_classess.html页面
input 输入框
input 提交按钮
接下来就要接收前端输入的数据：
if request.mothod='GET'
elif
request.mothod='POST'
request.POST.get('title') 拿到传过来的班级数据
然后通过创建的方式，写入对应的title字段数据库中
方法：models.Classes.objects.create(titile=title)
再返回给return redirect('/get_classes.html')
3、删除功能
配置url路由分发
加一个操作：
<th>操作</th>
一个a标签：
<a href="/del_classes.html?nid={{ row.id }}">删除</a>
实现删除操作，就是找到数据库中，对应的id字段(赋值给nid=id)，删除掉这个ID字段这行数据，就实现了删除功能。
4、实现编辑功能
在get_classes.html里添加一个a标签
配置路由分发
写def edit_classes函数
班级这个输入框前面id不显示,因为id不能被用户修改，所以要隐藏。
根据id拿到这个对象（id 走get方法），id存放在请求头中发送过去的。
obj对象里面包含id 和 title ，走post方法，title是放在请求体中发送过去的
第一次：get拿到id
if request.method == 'GET':
nid = request.GET.get('nid')
obj = models.Classes.objects.filter(id=nid).first()
return render(request, 'edit_classes.html', {'obj': obj})
第二次：post拿到id和title
elif request.method == 'POST':
nid = request.GET.get('nid')
title = request.POST.get('title')
models.Classes.objects.filter(id=nid).update(titile=title)
return redirect('/get_classes.html')
综合应用示例：
models.py
from django.db import models # Create your models here. class Classes(models.Model):
"""
班级表,男
"""
titile = models.CharField(max_length=32)
m = models.ManyToManyField("Teachers") class Teachers(models.Model):
"""
老师表，女
"""
name = models.CharField (max_length=32) """
cid_id tid_id
1 1
1 2
6 1
1000 1000
"""
# class C2T(models.Model):
# cid = models.ForeignKey(Classes)
# tid = models.ForeignKey(Teachers) class Student(models.Model):
username = models.CharField(max_length=32)
age = models.IntegerField()
gender = models.BooleanField()
cs = models.ForeignKey(Classes)
urls.py
"""django_one URL Configuration The `urlpatterns` list routes URLs to views. For more information please see:
https://docs.djangoproject.com/en/1.10/topics/http/urls/
Examples:
Function views
1. Add an import: from my_app import views
2. Add a URL to urlpatterns: url(r'^$', views.home, name='home')
Class-based views
1. Add an import: from other_app.views import Home
2. Add a URL to urlpatterns: url(r'^$', Home.as_view(), name='home')
Including another URLconf
1. Import the include() function: from django.conf.urls import url, include
2. Add a URL to urlpatterns: url(r'^blog/', include('blog.urls'))
"""
from django.conf.urls import url
from django.contrib import admin
from app01.views import classes urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^get_classes.html$', classes.get_classes),
url(r'^add_classes.html$', classes.add_classes),
url(r'^del_classes.html$', classes.del_classes),
url(r'^edit_classes.html$', classes.edit_classes), ]
classes.py
from django.shortcuts import render
from django.shortcuts import redirect
from app01 import models def get_classes(request):
cls_list = models.Classes.objects.all()
return render(request, 'get_classes.html', {'cls_list': cls_list}) def add_classes(request):
if request.method == "GET":
return render(request, 'add_classes.html')
elif request.method == 'POST':
title = request.POST.get('titile')
models.Classes.objects.create(titile=title)
return redirect('/get_classes.html') def del_classes(request):
nid = request.GET.get('nid')
models.Classes.objects.filter(id=nid).delete()
return redirect('/get_classes.html') def edit_classes(request):
if request.method == 'GET':
nid = request.GET.get('nid')
obj = models.Classes.objects.filter(id=nid).first()
return render(request, 'edit_classes.html', {'obj': obj})
elif request.method == 'POST':
nid = request.GET.get('nid')
title = request.POST.get('title')
models.Classes.objects.filter(id=nid).update(titile=title)
return redirect('/get_classes.html')
get_classes.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div>
<a href="/add_classes.html">添加</a>
</div>
<div>
<table border="">
<thead>
<tr>
<th>ID</th>
<th>名称</th>
<th>操作</th>
</tr>
</thead>
<tbody>
{% for row in cls_list %}
<tr>
<td>{{ row.id }}</td>
<td>{{ row.titile }}</td>
<td>
<a href="/del_classes.html?nid={{ row.id }}">删除</a>
|
<a href="/edit_classes.html?nid={{ row.id }}">编辑</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</body>
</html>
add_classes.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="add_classes.html" method="POST">
{% csrf_token %}
<input type="text" name="titile" />
<input type="submit" value="提交" />
</form>
</body>
</html>
edit_classes.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<form action="/edit_classes.html?nid={{ obj.id }}" method="POST">
{% csrf_token %}
<input type="text" name="title" value="{{ obj.titile }}" />
<input type="submit" value="提交"/>
</form>
</body>
</html>