30 - 表模型 - django.core.paginator - 分页

index.py

import inspect
from django.core.paginator import Paginator,PageNotAnInteger,EmptyPage
class Table_M():
    def __init__(self):
        self.class_name = "Table_M()"
    def to_json(self, data, info="转成json"):
        try:
            return_data = {
                "id":data.id,
                "name":data.name,
                "date":data.date
            }
            return return_data
        except Exception as e:
            logger.error(info+'数据库操作失败: '+ self.class_name + inspect.currentframe().f_code.co_name + str(e))
            raise
    def index(self,id,page,page_size):
       infoList=Info.objects.filter(user_id=id).order_by('id')
       paginator=Paginator(infoList,page_size)
       try:
           pageInfo=paginator.page(page)
       except PageNotAnInteger:
           pageInfo=paginator.page(1)
       except EmptyPage:
           pageInfo=paginator.page(paginator.num_pages)
       else:
           return_data = list(map(self.to_json, pageInfo))
           return_data = {
           "data":return_data,
           "page":page,
           "num_pages":paginator.num_pages,    # 总页数
           "count":paginator.count  # 总数据条数
           }
           return return_data

index.html

<div>
{% for list in pageInfo.object_list %}
<div>
    <img src="{{ list.photo.url }}">
       {% if list.title %}
    <h4>{{ list.title }}</h4>
    {% else %}
    <h4>相册图片</h4>
    {% endif %}
       {% if list.introduce %}
 <span>{{ list.introduce }}</span>
    {% else %}
<span>暂无介绍</span>
    {% endif %}
</div>
    {% endfor %}
 </div>
<div>
{% if pageInfo.has_previous %}
    <a href="{% url 'album' id pageInfo.previous_page_number %}">上一页</a>
{% endif %}
{% for page in pageInfo.paginator.page_range %}
{% if pageInfo.number == page %}
    <a href="javascript:;"> {{ page }}</a>
{% else %}
    <a href="{% url 'album' id page %}"> {{ page }}</a>
 {% endif %}
{% endfor %}
{% if pageInfo.has_next %}
        <a href="{% url 'album' id pageInfo.next_page_number %}">下一页</a>
{% endif %}
</div>

has_next/previous()判断当前页是否存在下一页/上一页
has_other_pages()判断当前页是否具有上一页或者下一页
next_page_number()如果当前页存在下一页则返回下一页的页数，否则抛出EmptyPage()
previous_page_number