分页功能的实现
Paginator(list,条数): count #总共的数量
num_pages #分的页面数
page_range #页码的范围
per_page #每页显示的对象(数量)
page() #获取某一页的对象
object_list #当前页的内容，元素
number #当前的页码
paginator #拿取分页的实例对象
has_next #有没有下一页
has_previous #有没有上一页
has_other_pages #当前页有没有上一页或者下一页
next_page_number #下一页的页码
previous_page_number #上一页的页码
start_index #当前页第一个对象的索引
end_index #当前页最后对象的索引
models.py 分别往这几个表中添加数据
from django.db import models
# Create your models here.
"""
一本书可能会有多个作者，一个作者也可以写多本书，
所以作者和书籍的关系就是多对多的关联关系(many-to-many)；
另外一本书只应该由一个出版商出版，
所以出版商和书籍是一对多关联关系(one-to-many)
作者详情模型和作者模型之间是一对一的关系（one-to-one）
"""
class Author(models.Model):
nid = models.AutoField(primary_key=True)
name=models.CharField( max_length=32)
age=models.IntegerField()
authorDetail=models.OneToOneField(to="AuthorDetail",to_field="nid",on_delete=models.CASCADE)
def __str__(self):
return self.name
class AuthorDetail(models.Model):
nid = models.AutoField(primary_key=True)
birthday=models.DateField()
telephone=models.BigIntegerField()
addr=models.CharField( max_length=64)
class Publish(models.Model):
nid = models.AutoField(primary_key=True)
name=models.CharField( max_length=32)
city=models.CharField( max_length=32)
email=models.EmailField()
def __str__(self):
return self.name
class Book(models.Model):
nid = models.AutoField(primary_key=True)
title = models.CharField( max_length=32)
publishDate=models.DateField()
price=models.DecimalField(max_digits=5,decimal_places=2)
publish=models.ForeignKey(to="Publish",to_field="nid",on_delete=models.CASCADE)
authors=models.ManyToManyField(to='Author',)
def __str__(self):
return self.title
views.py
from django.shortcuts import render
# Create your views here.
from .models import Author,AuthorDetail,Book,Publish
from django.core.paginator import Paginator, EmptyPage,PageNotAnInteger
def index(request):
book_list=Book.objects.all()
paginator = Paginator(book_list, 3) #按照每页显示3条来计算
print("count:", paginator.count) # 数据总数
print("num_pages", paginator.num_pages) # 总页数
print("page_range", paginator.page_range) # 页码的列表
page1 = paginator.page(1) # 第1页的page对象
for i in page1: # 遍历第1页的所有数据对象
print(i)
print(page1.object_list) # 第1页的所有数据
page2 = paginator.page(2)
print(page2.has_next()) # 是否有下一页
print(page2.next_page_number()) # 下一页的页码
print(page2.has_previous()) # 是否有上一页
print(page2.previous_page_number()) # 上一页的页码
page = request.GET.get('page',1) #将来访问的url是这样的 http://127.0.0.1:8000/路径/?page=1
currentPage=int(page)
try:
print(page)#当前页面
book_list = paginator.page(page)
except PageNotAnInteger:
book_list = paginator.page(1)
except EmptyPage:
book_list = paginator.page(paginator.num_pages)
return render(request,"page/index.html",{"book_list":book_list,"paginator":paginator,"currentPage":currentPage})
page目录下的index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
<div class="container">
<h4>分页器</h4>
<ul>
{% for book in book_list %}
<table border="1" style="height: 50px; width: 200px; font-style: italic;color: aqua;align-content: center">
<tr>
<td>{{ book.title }}</td>
<td>{{ book.price }}</td>
<td>{{ book.publishDate }}</td>
</tr>
</table>
{% endfor %}
</ul>
<ul class="pagination" id="pager">
{% if book_list.has_previous %}
<li class="previous"><a href="{% url 'page:index' %}?page={{ book_list.previous_page_number }}">上一页</a></li>
{% else %}
<li class="previous disabled"><a href="#">上一页</a></li>
{% endif %}
{% for num in paginator.page_range %}
{% if num == currentPage %}
<li class="item active"><a href="{% url 'page:index' %}?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="{% url 'page:index' %}?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if book_list.has_next %}
<li class="next"><a href="{% url 'page:index' %}?page={{ book_list.next_page_number }}">下一页</a></li>
{% else %}
<li class="next disabled"><a href="#">下一页</a></li>
{% endif %}
</ul>
</div>
</body>
</html>
views.py 显示每一页的详情页
def show(request):
book_objs = Book.objects.all()
page_obj = Paginator(book_objs,1)
print('数据总数',page_obj.count)
print('总页数',page_obj.num_pages)
print('页码列表',page_obj.page_range)
page1 = page_obj.page(1)
for i in page1:
print(i)
print(page1.object_list)
page2 = page_obj.page(2)
print(page2.has_previous())
print(page2.has_next())
print(page2.next_page_number())
print(page2.previous_page_number())
# page = page_obj.page(-1)
page_num = request.GET.get('page',1)
try:
current_page_num = int(page_num)
page_num_data = page_obj.page(current_page_num)
except PageNotAnInteger:
current_page_num = 1
page_num_data = page_obj.page(current_page_num)
except EmptyPage:
current_page_num = page_obj.num_pages
page_num_data = page_obj.page(current_page_num)
except Exception:
current_page_num = 1
page_num_data = page_obj.page(current_page_num)
if page_obj.num_pages > 11: #扩展，如果总的页码数大于了11，我们就不把所有的页码数显示出来了，只显示其中11个页面，当前页左边5个，右边5个
if current_page_num - 5 < 1:
pageRange = range(1,12)
elif current_page_num + 5 > page_obj.num_pages:
pageRange = range(page_obj.num_pages-10,page_obj.num_pages+1)
else:
pageRange = range(current_page_num - 5,current_page_num + 6)
else:
pageRange = page_obj.page_range
book_objs = page_num_data
return render(request,'page/show.html',{'book_objs':book_objs,'current_page_num':current_page_num,'page_obj':page_obj,'pageRange':pageRange})
page中的show.html
{% load static %}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap.min.css">
<body>
<h1>数据展示</h1>
<div class="container-fluid">
<div class="row">
<div class="col-md-6 col-md-offset-3">
<table class="table">
<thead>
<tr>
<th>id</th>
<th>title</th>
<th>价格</th>
<th>性别</th>
<th>出版日期</th>
<th>出版社</th>
<th>作者</th>
<th>操作</th>
</tr>
</thead>
<tbody>
{% for book_obj in book_objs %}
<tr>
<td>{{ book_obj.pk }}</td>
<td>{{ book_obj.title }}</td>
<td>{{ book_obj.price }}</td>
<td>{{ book_obj.get_sex_display }}</td>
<td>{{ book_obj.publishDate|date:'Y-d-m' }}</td>
<td>{{ book_obj.publish.name }}</td>
<td>
{% for author in book_obj.authors.all %}
{{ author.name }}
{% endfor %}
</td>
</tr>
{% endfor %}
</tbody>
</table>
<ul class="pagination" id="pager">
{% if book_objs.has_previous %}
<li class="previous"><a href="{% url 'page:show' %}?page={{ book_objs.previous_page_number }}">上一页</a></li>
{% else %}
<li class="previous disabled"><a href="javascript:void(0)">上一页</a></li>
{% endif %}
{# <!--{% for num in page_obj.page_range %}-->#}
{% for num in pageRange %}
{% if num == current_page_num %}
<li class="item active"><a href="{% url 'page:show' %}?page={{ num }}">{{ num }}</a></li>
{% else %}
<li class="item"><a href="{% url 'page:show' %}?page={{ num }}">{{ num }}</a></li>
{% endif %}
{% endfor %}
{% if book_objs.has_next %}
<li class="next"><a href="{% url 'page:show' %}?page={{ book_objs.next_page_number }}">下一页</a></li>
{% else %}
<li class="next disabled"><a href="#">下一页</a></li>
{% endif %}
</ul>
</div>
</div>
</div>
</body>
</html>
