Objek Django QuerySet, get() metode

Objek Django QuerySet, metode get()

2024-07-12

Lihat bab sebelumnya untuk modelnya:

Objek Django QuerySet, metode filter()-Blog CSDN

Metode get() dari objek QuerySet Django digunakan untuk memperoleh objek tunggal dari database.

1. Tambahkan fungsi tampilan

Uji/app11/views.py


from django.shortcuts import render
from .models import Post
 
def index(request):
    posts = Post.objects.all()
    return render(request, '11/index.html', {'posts': posts})
 
 
 
# apps/books/views.py
 
from django.shortcuts import render
from .models import Book
 
def book_list_view(request):
    # 使用filter()方法获取所有价格在10到20之间的书籍
    # books = Book.objects.filter(price__gte=10, price__lte=20)  # __gte是“greater than or equal to”（大于等于）的缩写，__lte是“less than or equal to”（小于等于）的缩写。
    # books = Book.objects.filter(price__gt=10)   # 在Django的ORM（对象关系映射）查询中，__gt是过滤条件的一个特殊语法，用于表示“大于”（greater than）。
    books = Book.objects.filter(price__lt=29.99)   # __lt 是“less than”（小于）的缩写。
    return render(request, '11/book_list.html', {'books': books})
 
def get_book_view(request):
    try:
        # 使用get()方法获取标题为"Python Cookbook"的书籍
        book = Book.objects.get(id=19)
        # 现在book变量包含了匹配的书籍对象
        print(book)
        return render(request, '11/book_detail.html', {'book': book})
    except Book.DoesNotExist:
        # 如果没有找到匹配的书籍，返回错误信息
        return HttpResponse("Book not found.")
    except Book.MultipleObjectsReturned:
        # 如果找到多个匹配的书籍，返回错误信息
        return HttpResponse("Multiple books found with the same title.")

2. Tambahkan kode html

Uji/templat/11/detail_buku.html


<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>书籍列表</title>
</head>
<body>
    <h2>书籍：{{ book }}</h2>
    <h1>{{ book.title }}</h1>
    <p>作者: {{ book.author }}</p>
    <p>日期: {{ book.publication_date }}</p>
    <p>价格: {{ book.price }}</p>
</body>
</html>

3. Tambahkan alamat perutean

Uji/app11/urls.py


from django.urls import path
from . import views
 
urlpatterns = [
    path('index/', views.index, name='index'),
    path('book_list_view/', views.book_list_view, name='book_list_view'),
    path('get_book_view/', views.get_book_view, name='get_book_view'),
]

4. Kunjungi halaman tersebut

http://127.0.0.1:8000/app11/dapatkan_tampilan_buku/

Terlihat data dengan ID 19 berhasil didapatkan.

Berbagi teknologi

Objek Django QuerySet, metode get()

1. Tambahkan fungsi tampilan

2. Tambahkan kode html

3. Tambahkan alamat perutean

4. Kunjungi halaman tersebut

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