django 和 mongdb 写一个简陋的网址,以及用django内置的分页功能

https://github.com/factsbenchmarks/simple_websit_about_58

一 设置

  数据库的设置

  在settings文件中加入这样一段代码:

from mongoengine import connect
connect('xxx',host='127.0.0.1',port=27017)

  说明:xxx 是某个数据库的名称。

 

二 定义models

class Info(mongoengine.DynamicDocument):
    meta = {
        'collection': 'info'
    }
    pub_date = mongoengine.StringField(max_length=20)
    area = mongoengine.ListField(mongoengine.StringField(max_length=5))
    title = mongoengine.StringField(max_length=50)
    url = mongoengine.URLField(max_length=100)
    price = mongoengine.StringField(max_length=10)

  说明:推荐继承DynamicDocument类。相关联的表的字段,不需要再Info类中都声明一次。如果是继承Document,每个field都要声明。

        Info类关联到某个表,在meta = {'collection':xx}绑定在一起。

 

三  理解接收代码

info = models.Info.objects
print(info)

  输出:

[<Info: Info object>, <Info: Info object>, <Info: Info object>, <Info: Info object>, <Info: Info object>, <Info: Info object>]

 

四  关于Paginator 内置分页器

  有一点绕,友情提示!

  part 1 

from django.core.paginator import Paginator
s = 'abcdefghijklmnopqrstuvwxyz'
p = Paginator(s,2)
p2 = p.page(2)
print(p2,type(p2))
print(p2.object_list)

  输出:

<Page 2 of 13> <class 'django.core.paginator.Page'>
cd

   part 2

s = 'abcdefghijklmnopqrstuvwxyz'
p = Paginator(s,2)
p2 = p.page(2)

print(p2.number)  # 当前页码
print(p2.paginator.num_pages)   #分页器的所有页码

  输出:

2
13

   part 3 下面这个就有点厉害了!

s = 'abcdefghijklmnopqrstuvwxyz'
p = Paginator(s,5)
p2 = p.page(4)

print(p2)
for i in p2 :   #把当前页的元素一一打出来
    print(i)

  输出:

<Page 4 of 6>
p
q
r
s
t

   part 4

s = 'abcdefghijklmnopqrstuvwxyz'
p = Paginator(s,5)
p2 = p.page(4)

print(p2)
print(p2.next_page_number())
print(p2.previous_page_number())
print(p2.has_next())
print(p2.has_previous())

  输出:

5
3
True
True

 

五 models

import mongoengine


class Info(mongoengine.DynamicDocument):
    meta = {
        'collection': 'info'
    }
    pub_date = mongoengine.StringField(max_length=20)
    area = mongoengine.ListField(mongoengine.StringField(max_length=5))
    title = mongoengine.StringField(max_length=50)
    url = mongoengine.URLField(max_length=100)
    price = mongoengine.StringField(max_length=10)

 

六 views

from django.core.paginator import Paginator



def index(request):
    limit = 5
    infos = models.Info.objects
    pagin = Paginator(infos,limit)
    page_num = request.GET.get('page',1)  # 字典操作,第一页没有page=,默认取值 1
    a_page = pagin.page(page_num)
    context = {
        'a_page':a_page,
    }
    return render(request,'index.html',context)

 

七 template

<body>
    <a href="?name='xxx'"><p>测试</p></a>
    <p>index页面</p>
    <div>
        {% for item in a_page %}
            <hr>
            <p>{{  item.title}} </p>
            <p>{{  item.date}}</p>
            <p>{{  item.url}} </p>
            <p>{{  item.area}} </p>
            <p>{{  item.price}} </p>
        {% endfor %}

    <div>
        {% if a_page.has_previous %}
            < <a href="?page={{ a_page.previous_page_number }}"> {{ a_page.previous_page_number }}</a>   {# 这里构建 a 标签,其href 还是挺让我吃惊的 #}
        {% endif %}                                                                                       {# href='?page=' 就是在主页后面直接拼接上#}
        {{ a_page.number }}
        {% if a_page.has_next %}
            <a href="?page={{ a_page.next_page_number }}"> {{ a_page.next_page_number }} </a>  >
        {% endif %}
    </div>
    </div>
</body>

 

八 urls

from django.conf.urls import url
from django.contrib import admin
from app01 import views

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^index/', views.index),
]

 

九 最终样式

  

 十  补充

 

  可以看到网址是 ?page=xx&name=xxx时,在Query String Parameters 中可以准确查到。

posted @ 2018-04-12 19:27  骑者赶路  阅读(128)  评论(0编辑  收藏  举报