django 实现
Title
1.输入信息，在底部输出用户输入的信息（数据存储在数据库中）
urls.py from django.contrib import admin from django.urls import path from first import views urlpatterns = [ path('admin/', admin.site.urls), path('info/', views.show_info), path('userInfo', views.show_userInfo), ]
models.py from django.db import models # Create your models here. class userinfo_table(models.Model): name = models.CharField(max_length=64) sex = models.CharField(max_length=64) email = models.CharField(ma
views.py from django.shortcuts import render, HttpResponse from first import models # Create your views here. # import datetime # def show_info(request): # # now_time = datetime.datetime.now() # request_content = request.method # return render(request, 'show_info.html', {'time': now_time, 'content': request_content}) # info_list = [] def show_userInfo(request): if request.method == 'POST': userName = request.POST.get('name', None) # 拿到前端用户输入的数据 userSex = request.POST.get('sex', None) userEmail = request.POST.get('email', None) # userinfo = {'username': userName, 'usersex': userSex, 'useremail': userEmail} models.userinfo_table.objects.create( # 向数据表中插入数据 name=userName, sex=userSex, email=userEmail, ) # 从数据库中取出数据，就相当于以键值对的方式进行存储，将多条字典数据存储在一个列表中 info_list = models.userinfo_table.objects.all() # info_list.append(userinfo) return render(request, 'userInfo.html', {'info_list': info_list})
userInfo.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form action="/userInfo" method="post"> <p>姓名：<input type="text" name="name"></p> <p>性别：<input type="text" name="sex"></p> <p>邮箱：<input type="text" name="email"></p> <p><input type="submit" name="submit"></p> </form> <table border="1px"> <tr> <td>姓名</td> <td>性别</td> <td>邮箱</td> </tr> {% for info in info_list %} <tr> <td>{{ info.name }}</td> <td>{{ info.sex }}</td> <td>{{ info.email }}</td> </tr> {% endfor %} </table> </body> </html>
2.可注册，可登录，用户登录信息存放再数据库中（django）
urls.py from django.contrib import admin from django.urls import path from first import views urlpatterns = [ path('admin/', admin.site.urls), path('info/', views.show_info), # path('userInfo', views.show_userInfo), path('login', views.login), path('signIn', views.signIn), path('firstPage', views.firstPage), ]
models.py from django.db import models # Create your models here. # class userinfo_table(models.Model): # # name = models.CharField(max_length=64) # sex = models.CharField(max_length=64) # email = models.CharField(max_length=64) class id_and_pwd(models.Model): userId = models.CharField(max_length=64) userPwd = models.CharField(max_length=64)
views.py from django.shortcuts import render, HttpResponse from first import models # Create your views here. import datetime def login(req): # 登录 if req.method == 'POST': user_id = req.POST.get('Id') user_pwd = req.POST.get('Pwd') # models.id_and_pwd.objects.create( # userId=user_id, # userPwd=user_pwd # ) all_userInfo = models.id_and_pwd.objects.all() for info in all_userInfo: if user_id == info.userId and user_pwd == info.userPwd: return HttpResponse('<h1>login succeed!</h1>') return render(req, 'login.html') def firstPage(req): # 显示首页 return render(req, 'firstPage.html') def signIn(req): # 注册 if req.method == "POST": user_id = req.POST.get('Id') user_pwd = req.POST.get('Pwd') models.id_and_pwd.objects.create( userId=user_id, userPwd=user_pwd ) return render(req, 'signIn.html')
login.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>login</title> </head> <body> <form action='/login' method="post"> <p>ID:<input type="text" name="Id"></p> <p>PASSWORD:<input type="password" name="Pwd"></p> <p><input type="submit" value="submit"></p> </form> </body> </html>
singIn.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>login</title> </head> <body> <form action='/signIn' method="post"> <p>ID:<input type="text" name="Id"></p> <p>PASSWORD:<input type="password" name="Pwd"></p> <p><input type="submit" value="submit"></p> </form> </body> </html>
firstPage.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>firstPage</title> </head> <body> <h1>welcome to study kingdom</h1> <input type="button" value='log in' onclick="login()"> <input type="button" value='sign in' onclick="sign_in()"> <script> function login() { window.location.href = 'http://127.0.0.1:8000/login'; // 点击跳转登录页面 } function sign_in(){ window.location.href = 'http://127.0.0.1:8000/signIn'; // 点击跳转注册页面 } </script> </body> </html>
# 数据库操作 def change(req): if req.method == 'POST': change_id = req.POST.get('id') change_name = req.POST.get('after_name') change_email = req.POST.get('after_email') change_obj = models.UserInfo.objects.get(id=change_id) change_obj.name = change_name change_obj.email = change_email change_obj.save() return redirect('/userInfoMode/') edit_id = req.GET.get('id') if edit_id: edit_obj = models.UserInfo.objects.get(id=edit_id) return render(req, 'change.html', {'data_obj': edit_obj})
3.数据库中多对多数据的查询方式
{% for book_info in book_obj %} <tr> <td>{{ book_info.title }}</td> {% for author in book_info.author.all %} <td>{{ author.name }}</td> {% endfor %} </tr> {% endfor %}
4.单表查询的下划线的一些方法
# 数据表结构 class Book(models.Model): id = models.AutoField(primary_key=True) title = models.CharField(max_length=64) create_date = models.DateField(auto_now_add=True) author = models.ManyToManyField(to='Author', related_name='books') models.Book.objects.filter(id__gt=xx, id__lt=xx) models.Book.objects.filter(id__in=[1, 2, 3, 4]) models.Book.objects.filter(id__range=[1, 5]) models.Book.objects.filter(title__contains='xx') # 字段中含有该字符串的 models.Book.objects.filter(title__icontains='xx') # 字段中含有该字符串的，不区分大小写 models.Book.objects.filter(title__startswith='xx') # 由该字符串开始的字段 models.Book.objects.filter(title__endswith='xx') # 由该字符串结束的字段 models.Book.objects.filter(create_date__day='xx') # 确定是某一天 models.Book.objects.filter(create_date__month='xx') # 确定是某一月 models.Book.objects.filter(create_date__year='xx') # 确定是某一年
5.当使用orm语句执行数据库操作的时候，显示相对应的sql语句
# setting配置 LOGGING = { 'version': 1, 'disable_existing': False, 'handlers': { 'console': { 'level': 'DEBUG', 'class': 'logging.StreamHandler' } }, 'loggers': { 'django.db.backends': { 'handlers': ['console'], 'propagate': True, 'level': 'DEBUG' } } } # django代码 import os import sys if __name__ == '__main__': os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'fatal_version.settings') import django django.setup() from app01 import models ret = models.UserInfo.objects.all() print(ret)
5.ajax计算器
// .html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> {# <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">#} {# <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">#} {# <link rel="stylesheet" href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css">#} </head> <body> <input type="text" name="first_num" id="num1">+ <input type="text" name="second_num" id="num2">= <input type="text" name="result" id="answer" value={{ res }}> <input type="button" id="compute" value="submit"> <script src="/static/jquery-3.3.1.min.js"></script> {#<script src="/static/bootstrap/js/bootstrap.min.js"></script>#} <script> $('#compute').on('click', function(){ $.ajax({ url: '/calculator/', type: 'POST', data: {"first_num": $('#num1').val(), "second_num": $('#num2').val()}, success: function(content){ $('#answer').val(content); } }) }) </script> </body> </html>
# views.py # ajax提交(计算器) def calculator(req): if req.method == 'POST': first_num = int(req.POST.get('first_num', None)) second_num = int(req.POST.get('second_num', None)) result = first_num + second_num return HttpResponse(result) return render(req, 'calculator.html')
6.django数据库自定义表名
# models.py class Meta: db_table = "xxxx" # 自定义表名
