两表连接进行增删改查

在model.py里添加模型类，增加外键,并生成迁移，运行迁移。

from django.db import models

# Create your models here.
class Major(models.Model):
    major_name = models.CharField(max_length=20,verbose_name='专业名')
    class Meta:
        verbose_name = '专业表'
        verbose_name_plural = verbose_name
        db_table = 'major'
    def __str__(self):
        return self.major_name
class Student(models.Model):
    stu_name = models.CharField(max_length=20,verbose_name='姓名')
    score = models.IntegerField(verbose_name='成绩')
    sex = models.CharField(max_length=3,verbose_name='性别')
    #增加外键
    major = models.ForeignKey(Major,on_delete=models.CASCADE,verbose_name='专业编号')
    class Meta:
        verbose_name = '学生表'
        verbose_name_plural = verbose_name
        db_table = 'student'
    def __str__(self):
        return self.stu_name

在admin.py里注册模型类。注册超级用户，并增加数据

from django.contrib import admin
from student.models import Major,Student
# Register your models here.
admin.site.register(Major)
admin.site.register(Student)

# 终端里注册超级用户
python manage.py createsuperuser

展示专业页面

Views.py
class MajorView(View):
    def get(self,request):
        major_data = Major.objects.all()
        content = {
            'majors' : major_data
        }
        return render(request,'major.html',content)

注册路由在urls.py

from django.urls import path
from student import views
urlpatterns = [
   path('major/',views.MajorView.as_view()),
]

展示页面

    
    


专业表

    {% for major in majors %}
    
    {% endfor %}

    

        
编号
        
专业名称
    

        
{{ major.id }}
        
{ major.id }}/">{{ major.major_name }}
    

展示学生页面

class StudentView(View):
    def get(self,request,id):
        student_data = Student.objects.filter(major_id = id)
        content = {
            'students' : student_data
        }
        return render(request,'student.html',content)

注册路由在urls.py

from django.urls import path
from student import views
urlpatterns = [
   path('student//',views.StudentView.as_view()),
]

展示页面

   
   


学生表

   {% for student in students %}
   
   {% endfor %}

   

       
编号
       
姓名
       
成绩
       
性别
       
专业编号
       
操作
   

       
{{ student.id }}
       
{{ student.stu_name }}
       
{{ student.score }}
       
{{ student.sex }}
       
{{ student.major }}
       

           { student.id }}/">删除
           { student.id }}/">修改
       
   

可以在专业页面下边写post方法

    def post(self,request):
       name = request.POST.get('name')
       score = request.POST.get('score')
       sex = request.POST.get('sex')
       major = request.POST.get('major')
       try:
           Student.objects.create(
               stu_name = name,
               score = score,
               sex = sex,
               major_id = major
           )
       except Exception as e:
           print(e)
           return HttpResponse('添加失败')
       return redirect('/major/')

在专业页面下边写添加表单

   {% csrf_token %}
   姓名：

   成绩：

   性别：

   专业编号：

   

class DeleteView(View):
   def get(self,request,id):
       Student.objects.filter(id=id).delete()
       return redirect('/major/')

注册动态路由

from django.urls import path
from student import views
urlpatterns = [
   path('delete//',views.DeleteView.as_view()),
]

在学生页面后边增加删除操作

{ student.id }}/">删除

class UpdateView(View):
   def get(self,request,id):
       try:
           student_data = Student.objects.get(id = id)
           content = {
               'students' : student_data
           }
       except Exception as e:
           print(e)
           return HttpResponse('获取数据失败')
       return render(request,'update.html',content)
   def post(self,request,id):
       name = request.POST.get('name')
       score = request.POST.get('score')
       sex = request.POST.get('sex')
       major = request.POST.get('major')
       try:
           Student.objects.filter(id=id).update(
               stu_name = name,
               score = score,
               sex = sex,
               major = major
           )
       except Exception as e:
           print(e)
           return HttpResponse('修改失败')
       return redirect('/major/')

注册动态路由

from django.urls import path
from student import views
urlpatterns = [
  path('update//',views.UpdateView.as_view())
]

在学生页面后边增加删除操作

  { student.id }}/">修改