第54天：django学习（三）-编程知识

页面上的增删改查

创建一个django项目（使用django3版本）day54——dj，并创建应用app01

在models.py文件中创建表

class UserInfo(models.Model):username = models.CharField(max_length=32)password = models.CharField(max_length=32)gender = models.CharField(max_length=32)

迁移数据库到db.sqlite3

用户列表展示

在urls.py文件中配置路由

from django.contrib import admin
from django.urls import path
from app01 import viewsurlpatterns = [path('admin/', admin.site.urls),path('userlist/', views.userlist)
]

视图文件view.py

from django.shortcuts import render, HttpResponse, redirect
from app01 import models# Create your views here.def userlist(request):user_list = models.UserInfo.objects.all()return render(request, 'user_list.html', locals())

模板文件user_list.html

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><style></style><script src="/static/js/jquery_3.7.1_jquery.min.js"></script><link rel="stylesheet" href="/static/bootstrap-3.4.1-dist/css/bootstrap.min.css"><script src="/static/bootstrap-3.4.1-dist/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container"><div class="row"><h1 class="text-center">用户列表</h1><a href="" class="btn btn-success">添加</a><table class="table table-striped table-hover table-bordered"><thead><tr><td>ID</td><td>username</td><td>password</td><td>gender</td><td>action</td></tr></thead><tbody>{% for user in user_list  %}<tr><td>{{ user.id }}</td><td>{{ user.username }}</td><td>{{ user.password }}</td><td>{{ user.gender }}</td><td><a href="" class="btn btn-success">修改</a>&nbsp;&nbsp;&nbsp;<a href="" class="btn btn-danger">删除</a></td></tr>{% endfor %}</tbody></table></div>
</div>
</body>
</html

用户列表的修改功能

在路由文件中添加路由

path('edit/', views.edit),

在视图文件view.py中添加edit方法

def edit(request):edit_id = request.GET.get('id')edit_obj = models.UserInfo.objects.filter(id=edit_id).first()if request.method == 'POST':username = request.POST.get('username')password = request.POST.get('password')gender = request.POST.get('gender')print(username, password, gender)affect_rows = models.UserInfo.objects.filter(id=edit_id).update(username=username, password=password,gender=gender)return redirect('/userlist/')return render(request, 'edit.html', locals())

在模板文件user_list.html中添加路径

<a href="/edit/?id={{user.id}}" class="btn btn-success">修改</a>&nbsp;&nbsp;&nbsp;

添加模板文件edit.html

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><style></style><script src="/static/js/jquery_3.7.1_jquery.min.js"></script><link rel="stylesheet" href="/static/bootstrap-3.4.1-dist/css/bootstrap.min.css"><script src="/static/bootstrap-3.4.1-dist/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container"><div class="row"><h1 class="text-center">修改页面</h1><form action="" method="POST"><div class="form-group">用户名：<input type="text" class="form-control" name="username" value="{{ edit_obj.username }}"></div><div class="form-group">密码：<input type="password" class="form-control" name="password" value="{{ edit_obj.password }}"></div><div class="form-group">性别：<input type="text" class="form-control" name="gender" value="{{ edit_obj.gender }}"></div><div class="form-group"><input type="submit" class="btn btn-info btn-block" value="确定"></div></form></div>
</div>
</body>
</html>

用户列表的删除功能

在路由文件中添加路由

path('delete/', views.delete),

在视图文件view.py中添加delte方法

def delete(request):del_id = request.GET.get('id')del_obj = models.UserInfo.objects.filter(id=del_id).delete()return redirect('/userlist/', locals())

在模板文件user_list.html中添加路径

<a href="/delete/?id={{ user.id }}" class="btn btn-danger">删除</a>

用户列表的添加功能

在路由文件中添加路由

path('add/', views.delete),

在视图文件view.py中添加delte方法

def add(request):if request.method == 'POST':username = request.POST.get('username')password = request.POST.get('password')gender = request.POST.get('gender')affect_rows = models.UserInfo.objects.create(username=username, password=password, gender=gender)return redirect('/userlist/', locals())return render(request, 'add.html')

在模板文件user_list.html中添加l路径

<a href="/add/" class="btn btn-success">添加</a>

添加模板文件add.html

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><style></style><script src="/static/js/jquery_3.7.1_jquery.min.js"></script><link rel="stylesheet" href="/static/bootstrap-3.4.1-dist/css/bootstrap.min.css"><script src="/static/bootstrap-3.4.1-dist/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container"><div class="row"><h1 class="text-center">添加页面</h1><form action="" method="POST"><div class="form-group">用户名：<input type="text" class="form-control" name="username"></div><div class="form-group">密码：<input type="password" class="form-control" name="password"></div><div class="form-group">性别：<input type="text" class="form-control" name="gender"></div><div class="form-group"><input type="submit" class="btn btn-info btn-block" value="添加"></div></form></div>
</div>
</body>
</html>

创建表关系

在models.py文件中创建表关系

"""图书表"""
class Book(models.Model):title = models.CharField(max_length=64)price = models.DecimalField(max_digits=8, decimal_places=2)"""对于外键字段关系，会自动帮我们拼接_id"""publish = models.ForeignKey(to='Publish')"""authors它是一个虚拟字段，它不会实际在表中创建出来这个字段，这一句可以自动帮助我们创建出来第三张表"""authors = models.ManyToManyField(to='Author')"""出版社表"""
class Publish(models.Model):name = models.CharField(max_length=64)addr = models.CharField(max_length=64)"""作者表"""
class Author(models.Model):name = models.CharField(max_length=64)author_detail = models.OneToOneField(to='AuthorDetail')"""作者详情表"""
class AuthorDetail(models.Model):phone = models.CharField(max_length=64)email = models.CharField(max_length=64)