ORM单表操作练习

2021-11-22 18:33:08 阅读：125 来源： 互联网

标签：title Book price 练习 request publish django ORM 单表

1 查询操作练习

1 查询老男孩出版社出版过的价格大于200的书籍
2 查询2017年8月出版的所有以py开头的书籍名称
3 查询价格为50,100或者150的所有书籍名称及其出版社名称
4 查询价格在100到200之间的所有书籍名称及其价格
5 查询所有人民出版社出版的书籍的价格（从高到低排序，去重）

def abc(request):
   res1 = Book.objects.filter(publish="老男孩出版社", price__gt=200)
   res2 = Book.objects.filter(pub_date__year=2017, pub_date__month=8, title__startswith="py").values("title")
   res3 = Book.objects.filter(price__in=[50, 100, 150]).values("title", "publish")
   res4 = Book.objects.filter(price__range=[100, 200]).values("title", "price")
   res5 = Book.objects.filter(publish="人民出版社").order_by("-price").values("price").distinct()
   print(res1, res2, res3, res4, res5)
   return HttpResponse("OK")

2 图书管理系统

实现功能：book单表的增删改查

models.py

from django.db import models

# Create your models here.


class Book(models.Model):
    id = models.AutoField(primary_key=True)
    title = models.CharField(max_length=32)
    price = models.DecimalField(max_digits=8, decimal_places=2)
    pub_date = models.DateField()
    publish = models.CharField(max_length=32)

views.py

from django.shortcuts import render, redirect
from app01.models import Book
from django.urls import reverse

# Create your views here.


def check(request):
    res = Book.objects.all().values("id", "title", "price", "pub_date", "publish")
    return render(request, "check.html", locals())


def add(request):
    if request.method == 'GET':
        return render(request, "add.html")
    Book.objects.create(
        title=request.POST.get("title"),
        price=request.POST.get("price"),
        publish=request.POST.get("publish"),
        pub_date=request.POST.get("pub_date"),
    )
    url = reverse("check")
    return redirect(url)


def delete(request, number):
    Book.objects.filter(id=number).delete()
    url = reverse("check")
    return redirect(url)


def edit(request, number):
    if request.method == 'GET':
        res = Book.objects.filter(id=number).values("id", "title", "price", "pub_date", "publish")
        return render(request, "edit.html", locals())
    Book.objects.filter(id=number).update(
        title=request.POST.get("title"),
        price=request.POST.get("price"),
        publish=request.POST.get("publish"),
        pub_date=request.POST.get("pub_date"),
    )
    url = reverse("check")
    return redirect(url)

orm_lx.__init__.py

import pymysql

pymysql.install_as_MySQLdb()

settings.py

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'orm1',
        'USER': 'root',
        'PASSWORD': '123456',
        'HOST': '127.0.0.1',
        'PORT': 3306
    }
}

STATICFILES_DIRS = [
    os.path.join(BASE_DIR, "statics"),
]

orm_lx.urls.py

from django.contrib import admin
from django.urls import path
from app01 import views

urlpatterns = [
    path('admin/', admin.site.urls),
    path("check/", views.check, name="check"),
    path("add/", views.add, name="add"),
    path("delete/<int:number>/", views.delete),
    path("edit/<int:number>", views.edit),
]

add.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>添加书籍</title>
    <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>
    <script src="/static/jQuery3.6.js"></script>
</head>
<body>
<div class="container">
    <h3>添加书籍</h3>
    <p></p>
    <div class="row">
        <div class="col-md-4 col-md-offset-2">
            <form action="{% url 'add' %}" method="post">
                {% csrf_token %}
                <p>
                    <label for="i1">
                        书籍名称：
                        <input type="text" name="title" class="form-control" id="i1">
                    </label>
                </p>
                <p>
                    <label for="i2">
                        价格：
                        <input type="text" name="price" class="form-control" id="i2">
                    </label>
                </p>
                <p>
                    <label for="i3">
                        出版社：
                        <input type="text" name="publish" class="form-control" id="i3">
                    </label>
                </p>
                <p>
                    <label for="i4">
                        出版日期：
                        <input type="date" name="pub_date" class="form-control" id="i4">
                    </label>
                </p>
                <p>
                    <input type="submit" value="提交" class="btn btn-primary pull-left">
                </p>
            </form>
        </div>
    </div>
</div>
</body>
</html>

check.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>查看书籍</title>
    <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>
    <script src="/static/jQuery3.6.js"></script>
    <style>
        a {
            color: white;
        }

        a:hover {
            text-decoration: none;
            color: orange;
        }
    </style>
</head>
<body>
<div class="container">
    <h3>查看书籍</h3>
    <div class="row">
        <div class="col-md-8 col-md-offset-2">
            <button class="btn btn-info"><a href="{% url 'add' %}">添加书籍</a></button>
            <p></p>
            <table class="table table-striped text-center table-bordered">
                <thead>
                <tr>
                    <th class="text-center">书籍名称</th>
                    <th class="text-center">价格</th>
                    <th class="text-center">出版日期</th>
                    <th class="text-center">出版社</th>
                    <th class="text-center">删除操作</th>
                    <th class="text-center">编辑操作</th>
                </tr>
                </thead>
                <tbody>
                {% for i in res %}
                    <tr>
                        <td>{{ i.title }}</td>
                        <td>{{ i.price }}</td>
                        <td>{{ i.pub_date|date:"Y-m-d" }}</td>
                        <td>{{ i.publish }}</td>
                        <td>
                            <button class="btn btn-danger btn-sm"><a href="/delete/{{ i.id }}">删除</a></button>
                        </td>
                        <td>
                            <button class="btn btn-warning btn-sm"><a href="/edit/{{ i.id }}">编辑</a></button>
                        </td>
                    </tr>
                {% endfor %}
                </tbody>
            </table>
        </div>
    </div>
</div>
</body>
</html>

edit.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>编辑书籍</title>
    <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>
    <script src="/static/jQuery3.6.js"></script>
</head>
<body>
<div class="container">
    <h3>编辑书籍</h3>
    <p></p>
    <div class="row">
        <div class="col-md-4 col-md-offset-2">
            {% for res in res %}
            <form action="/edit/{{ res.id }}" method="post">
                {% csrf_token %}
                <p>
                    <label for="i1">
                        书籍名称：
                        <input type="text" name="title" class="form-control" id="i1" value={{ res.title }}>
                    </label>
                </p>
                <p>
                    <label for="i2">
                        价格：
                        <input type="text" name="price" class="form-control" id="i2" value={{ res.price }}>
                    </label>
                </p>
                <p>
                    <label for="i3">
                        出版社：
                        <input type="text" name="publish" class="form-control" id="i3" value={{ res.publish }}>
                    </label>
                </p>
                <p>
                    <label for="i4">
                        出版日期：
                        <input type="date" name="pub_date" class="form-control" id="i4" value={{ res.pub_date|date:"Y-m-d" }}>
                    </label>
                </p>
                <p>
                    <input type="submit" value="提交" class="btn btn-primary pull-left">
                </p>
            </form>
            {% endfor %}
        </div>
    </div>
</div>
</body>
</html>

标签：title,Book,price,练习,request,publish,django,ORM,单表
来源： https://www.cnblogs.com/xuewei95/p/15589761.html

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ORM单表操作练习

1 查询操作练习

2 图书管理系统