Django分頁器
阿新 • • 發佈：2021-12-13
from django.shortcuts import render from .models import * from django.core.paginator import Paginator, EmptyPage def page(request): # 拿到資料庫queryset物件 book_queryset = Book.objects.all() # 每頁10條資料，並將資料庫queryset物件傳入 """類例項化，paginator_set物件方法有count/num_pages/page_range，都不需要加括號執行""" paginator_set= Paginator(book_queryset, 10) # 獲取前端傳送過來的page值，如果沒有page引數(第一次進入頁面時)或page引數為空，那麼預設為1 page_num = int(request.GET.get("page", 1)) # 如果page_num值不在總頁數之間，那麼paginator_set.page()會報EmptyPage錯 try: """類例項化，物件中包含每一頁10條書籍的物件，物件方法有has_next()/has_previous()/next_page_number()/previous_page_number()/start_index()/end_index()""" current_page = paginator_set.page(page_num) except EmptyPage as e: current_page = paginator_set.page(1) # 如果總頁數大於12，那麼按照下面的邏輯進行判斷 if paginator_set.num_pages > 12: # 當前頁減去5小於1，那麼頁數維持在(1, 11) if page_num-5 < 1: page_range = range(1, 12)# 當前頁加上5大於總頁數，那麼頁數維持在(總頁數-10, 尾頁+1) elif page_num+5 > paginator_set.num_pages: page_range = range(paginator_set.num_pages-10, paginator_set.num_pages+1) # 當前頁-5不小於1而且+5不大於總頁數，那麼頁數維持在(當前頁-5, 當前頁+6) else: page_range = range(page_num-5, page_num+6) # 如果總頁數小於12，那麼頁數和總頁數一樣，不做任何邏輯判斷 else: page_range = paginator_set.page_range return render(request, "page.html", locals())
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</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"> <div class="row"> <div class="col-md-10 col-md-offset-1"> <table class="table table-bordered table-striped"> <thead> <tr> <th>序號</th> <th>書籍名稱</th> <th>書籍價格</th> </tr> </thead> <tbody> {# 迴圈paginator_set.page()例項化的物件，可以取到每一個的書籍物件 #} {% for current in current_page %} {# 如果是每一頁第一條資料， 那麼序號則展示其start_index，start_index()返回值的計算方法是：(分頁條數*(當前頁-1))+1 #} {% if current.first %} <tr> <td>{{ current_page.start_index }}</td> <td>{{ current.title }}</td> <td>{{ current.price }}</td> </tr> {# 如果不是每一頁第一條資料，那麼利用start_index()方法計算的值加counter0的值，結果範圍為(start_index()+1,start_index()+9) #} {% else %} <tr> <td>{{ forloop.counter0|add:current_page.start_index }}</td> <td>{{ current.title }}</td> <td>{{ current.price }}</td> </tr> {% endif %} {% endfor %} </tbody> </table> <div class="text-center"> <nav aria-label="Page navigation"> <ul class="pagination"> {# 首頁按鈕，固定page=1 #} <li> <a href="?page=1" aria-label="Previous"> <span aria-hidden="true">首頁</span> </a> </li> {# 如果上一頁還有資料，那麼讓其可繼續點選進入上一頁 #} {% if current_page.has_previous %} <li> <a href="?page={{ current_page.previous_page_number }}" aria-label="Previous"> <span aria-hidden="true">«</span> </a> </li> {# 如果上一頁沒有資料了，那麼不讓做任何操作 #} {% else %} <li class="disabled"> <span aria-hidden="true">«</span> </li> {% endif %} {# 由後端經邏輯判斷後的page_range頁數列表進行迴圈 #} {% for page in page_range %} {# 如果迴圈的頁碼與當前檢視的頁碼相等，那麼就讓其高亮顯示 #} {% if page == page_num %} <li class="active"><a href="?page={{ page }}">{{ page }}</a></li> {% else %} <li><a href="?page={{ page }}">{{ page }}</a></li> {% endif %} {% endfor %} {# 如果當前頁還有下一頁，那麼讓其可以點選進入下一頁 #} {% if current_page.has_next %} <li> <a href="?page={{ current_page.next_page_number }}" aria-label="Next"> <span aria-hidden="true">»</span> </a> </li> {# 如果當前頁沒有下一頁了，那麼不讓做任何操作 #} {% else %} <li class="disabled"> <span aria-hidden="true">»</span> </li> {% endif %} {# 跳轉到尾頁，讓page引數直接等於總頁數 #} <li> <a href="?page={{ paginator_set.num_pages }}" aria-label="Previous"> <span aria-hidden="true">尾頁</span> </a> </li> </ul> </nav> </div> </div> </div> </div> </body> </html>
ORM批量插入資料方法推薦
from .models import *
book_list = [] for i in range(100): book_obj = Book( title="book_%s" % i, price=i * i, ) book_list.append(book_obj) Book.objects.bulk_create(book_list)while True: print('studying...')