实现一对多表查询功能
项目代码：
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
from app01.views import students 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), url(r'^get_students.html$', students.get_students),
url(r'^add_students.html$', students.add_students),
url(r'^del_students.html$', students.del_students),
url(r'^edit_students.html$', students.edit_students), ]
students.py
from django.shortcuts import render
from django.shortcuts import redirect
from app01 import models def get_students(request):
stu_list = models.Student.objects.all()
# for i in stu_list:
# print(i.id,i.username,i.age,i.cs.id,i.cs.titile)
return render(request,'get_students.html',{'stu_list':stu_list}) def add_students(request):
if request.method == 'GET':
cs_list = models.Classes.objects.all()
return render(request, 'add_students.html', {'cs_list': cs_list}) elif request.method == 'POST':
u = request.POST.get('username')
a = request.POST.get('age')
g = request.POST.get('gender')
c = request.POST.get('cs')
models.Student.objects.create(
username=u,
age=a,
gender=g,
cs_id=c,
)
return redirect('/get_students.html') def del_students(request):
nid = request.GET.get('nid')
models.Student.objects.filter(id=nid).delete()
return redirect('get_students.html') def edit_students(request):
if request.method == "GET":
nid = request.GET.get('nid')
obj = models.Student.objects.filter(id=nid).first()
cls_list = models.Classes.objects.all() return render(request, 'edit_students.html',{'obj': obj,'cls_list': cls_list}) elif request.method == "POST":
u = request.GET.get('username')
a = request.GET.get('age')
g = request.GET.get('gender')
c = request.GET.get('cs')
models.Student.objects.filter(nid=id).update(
username=u,
age=a,
gender=g,
cs_id=c,
)
return redirect('/get_students.html')
get_students.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div>
<a href="/add_students.html">添加</a>
</div>
<div>
<table border="">
<thead>
<tr>
<th>ID</th>
<th>姓名</th>
<th>年龄</th>
<th>性别</th>
<th>班级</th>
<th>操作</th>
</tr>
</thead>
<tbody>
{% for row in stu_list %}
<tr>
<td>{{ row.id }}</td>
<td>{{ row.username }}</td>
<td>{{ row.age }}</td>
{% if row.gender %}
<td>男</td>
{% else %}
<td>女</td>
{% endif %}
<td>{{ row.cs.titile }}</td>
<td>
<a href="/del_students.html?nid={{ row.id }}">删除</a>
|
<a href="/edit_students.html?nid={{ row.id }}">编辑</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</body>
</html>
add_students.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h3>添加用户</h3>
<form action="/add_students.html" method="POST">
{% csrf_token %}
<p><input type="text" name="username" placeholder="用户名" /></p>
<p><input type="text" name="age" placeholder="年龄" /></p>
<p>
男:<input type="radio" name="gender" value="" />
女:<input type="radio" name="gender" value="" />
</p>
<p>
<select name="cs">
{% for foo in cs_list %}
<option value="{{ foo.id }}">{{ foo.titile }}</option>
{% endfor %}
</select>
</p>
<input type="submit" value="提交">
</form>
</body>
</html>
edit_students.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/edit_students.html" method="POST">
{% csrf_token %}
<p><input type="text" name="username" placeholder="用户名" value="{{ obj.username }}"/></p>
<p><input type="text" name="age" placeholder="年龄" value="{{ obj.age }}"/></p>
<p>
{% if obj.gender %}
男:<input type="radio" name="gender" value="" checked/>
女:<input type="radio" name="gender" value=""/>
{% else %}
男:<input type="radio" name="gender" value=""/>
女:<input type="radio" name="gender" value="" checked/>
{% endif %}
</p>
<p>
<select name="cs">
{% for foo in cls_list %}
{% if obj.cs_id == foo.id %}
<option value="{{ foo.id }}" selected>{{ foo.titile }}</option>
{% else %}
<option value="{{ foo.id }}">{{ foo.titile }}</option>
{% endif %}
{% endfor %}
{
</select>
</p>
<input type="submit" value="提交">
</form>
</body>
</html>