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Django工程读取mongodb并使用分页器

2016-02-08 11:41 651 查看

pycharm开发django工程（二）项目需求： 1. 从mongodb中读取数据，并显示到网页中 2. 在网页显示的每一页加入分页符首先使用pycharm的企业版新建一个django的虚拟工程（参考我的上一个博客），这是初始的显示效果

这是原始的html文件，css文件在本文的最后，至于图片就随意照一张改名就行

{% load static %}

<html lang="en">

<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="A layout example that shows off a blog page with a list of posts.">
<title>Blog – Layout Examples – Pure</title>
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/pure-min.css' %}">
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/grids-responsive-old-ie-min.css' %}">
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/grids-responsive-min.css' %}">
<link rel="stylesheet" href="{% static 'css/layouts/blog-old-ie.css' %}">
<link rel="stylesheet" href="{% static 'css/layouts/blog.css' %}">
</head>

<body>

<div class="content pure-u-1 pure-u-md-3-4">
<div>
<!-- A wrapper for all the blog posts -->
<div class="posts">
<h1 class="content-subhead">Pinned Post</h1>
<!-- A single blog post -->

<section class="post">
<header class="post-header">
<img class="post-avatar" alt="Tilo Mitra's avatar" height="48" width="48"
src="{% static 'img/common/tilo-avatar.png' %}">
<h2 class="post-title">Introducing Pure</h2>
<p class="post-meta">
By <a href="#" class="post-author">Tilo Mitra</a> under <a
class="post-category post-category-design" href="#">CSS</a> <a
class="post-category post-category-pure" href="#">Pure</a>
</p>
</header>

<div class="post-description">
<p>

Yesterday at CSSConf, we launched Pure – a new CSS library. Phew! Here are the <a
href="https://speakerdeck.com/tilomitra/pure-bliss">slides from the presentation</a>.
Although it looks pretty minimalist, we’ve been working on Pure for several months. After many
iterations, we have released Pure as a set of small, responsive, CSS modules that you can use in
every web project.
</p>
</div>
</section>
</div>
</div>
</div>
</body>
</html>

首先要安装mongoengine

pip3 install mongoengine

然后在settings.py文件中定义mongodb的连接（要连接的mongodb数据库名为test，使用到的是test数据库里的一张名为sample的表）

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

在models.py文件中定义读取的数据库字段

from django.db import models
from mongoengine import *

connect('test', host='127.0.0.1', port=27017) # 指明要连接的数据库

class ArtiInfo(Document):
title = StringField()
url = StringField()
price = StringField()
pub_date = StringField()
look = StringField()
area = ListField(StringField()) # 定义列表类型
cates = ListField(StringField())

meta = { 'collection': 'sample'} # 指明连接数据库的哪张表

for i in ArtiInfo.objects[:10]: # 测试是否连接成功
print(i.title)

在这里可以直接运行models.py文件，看是否能读出数据库里的内容，注意要把数据库中的字段全部定义出来

修改views.py文件，定义要传递到html文件中的内容

from django.shortcuts import render
from myblog.models import ArtiInfo

def index(request):
article = ArtiInfo.objects[:10] #只显示前10个内容
context = {
'ArtiInfo':article
}

return render(request, 'index.html', context) # 传递context参数

修改index.html文件，在文件中循环显示从数据库中读取的数据

{% load static %}
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="A layout example that shows off a blog page with a list of posts.">
<title>Blog – Layout Examples – Pure</title>
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/pure-min.css' %}">
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/grids-responsive-old-ie-min.css' %}">
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/grids-responsive-min.css' %}">
<link rel="stylesheet" href="{% static 'css/layouts/blog-old-ie.css' %}">
<link rel="stylesheet" href="{% static 'css/layouts/blog.css' %}">
</head>

<body>

<div class="content pure-u-1 pure-u-md-3-4">
<div>
<!-- A wrapper for all the blog posts -->
<div class="posts">
<h1 class="content-subhead">Pinned Post</h1>
{% for item in ArtiInfo %}
<!-- A single blog post -->
<section class="post">
<header class="post-header">
<img class="post-avatar" alt="Tilo Mitra's avatar" height="48" width="48"
src="{% static 'img/common/tilo-avatar.png' %}">
<h3 class="post-title">{{ item.title }}</h3>
<p class="post-meta">
By <a href="#" class="post-author">{{ item.pub_date }}</a>
{% for each in item.cates %}
<a class="post-category post-category-design" href="#">{{ each }}</a>
{% endfor %}
</p>
</header>

<div class="post-description">
<p>
{{ item.url }}
</p>
</div>
</section>
{% endfor %}
</div>
</div>
</div>
</body>
</html>

这是从数据库里读取的效果

添加分页器
在上面的views.py文件中添加分页器

from django.shortcuts import render
from myblog.models import ArtiInfo
from django.core.paginator import Paginator

def index(request):
limit = 1 #限制每一页显示的条目数量
article = ArtiInfo.objects
paginator = Paginator(article, limit)
page_num = request.GET.get('page', 1) #从url中获取页码参数
loaded = paginator.page(page_num)

context = {
'ArtiInfo':loaded
}

return render(request, 'index.html', context)

在Index.html文件的末尾处添加分页器

{% load static %}
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="A layout example that shows off a blog page with a list of posts.">
<title>Blog – Layout Examples – Pure</title>
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/pure-min.css' %}">
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/grids-responsive-old-ie-min.css' %}">
<link rel="stylesheet" href="http://yui.yahooapis.com/pure/0.6.0/grids-responsive-min.css' %}">
<link rel="stylesheet" href="{% static 'css/layouts/blog-old-ie.css' %}">
<link rel="stylesheet" href="{% static 'css/layouts/blog.css' %}">
</head>
<body>

<div class="content pure-u-1 pure-u-md-3-4">
<div>
<!-- A wrapper for all the blog posts -->
<div class="posts">
<h1 class="content-subhead">Pinned Post</h1>
{% for item in ArtiInfo %}
<!-- A single blog post -->
<section class="post">
<header class="post-header">
<img class="post-avatar" alt="Tilo Mitra's avatar" height="48" width="48" src="{% static 'img/common/tilo-avatar.png' %}">

<h3 class="post-title">{{ item.title }}</h3>

<p class="post-meta">
By <a href="#" class="post-author">{{ item.pub_date }}</a>
{% for each in item.cates %}
<a class="post-category post-category-design" href="#">{{ each }}</a>
{% endfor %}
</p>
</header>

<div class="post-description">
<p>
{{ item.url }}
</p>
</div>
</section>
{% endfor %}
</div>
<div class="main-content-pagitor">
{% if ArtiInfo.has_previous %}
<a href="?page={{ ArtiInfo.previous_page_number }}"> 上一页</a>
{% endif %}
<span>{{ ArtiInfo.number }} of {{ ArtiInfo.paginator.num_pages }}</span>
{% if ArtiInfo.has_next %}
<a href="?page={{ ArtiInfo.next_page_number }}">下一页</a>
{% endif %}
</div>
</div>
</div>

</body>
</html>

这是最终的显示效果

本文中使用到的css文件如下：

* {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}

a {
text-decoration: none;
color: rgb(61, 146, 201);
}
a:hover,
a:focus {
text-decoration: underline;
}

h3 {
font-weight: 100;
}

/* LAYOUT CSS */
.pure-img-responsive {
max-width: 100%;
height: auto;
}

#layout {
padding: 0;
}

.header {
text-align: center;
top: auto;
margin: 3em auto;
}

.sidebar {
background: rgb(61, 79, 93);
color: #fff;
}

.brand-title,
.brand-tagline {
margin: 0;
}
.brand-title {
text-transform: uppercase;
}
.brand-tagline {
font-weight: 300;
color: rgb(176, 202, 219);
}

.nav-list {
margin: 0;
padding: 0;
list-style: none;
}
.nav-item {
display: inline-block;
*display: inline;
zoom: 1;
}
.nav-item a {
background: transparent;
border: 2px solid rgb(176, 202, 219);
color: #fff;
margin-top: 1em;
letter-spacing: 0.05em;
text-transform: uppercase;
font-size: 85%;
}
.nav-item a:hover,
.nav-item a:focus {
border: 2px solid rgb(61, 146, 201);
text-decoration: none;
}

.content-subhead {
text-transform: uppercase;
color: #aaa;
border-bottom: 1px solid #eee;
padding: 0.4em 0;
font-size: 80%;
font-weight: 500;
letter-spacing: 0.1em;
}

.content {
padding: 2em 1em 0;
}

.post {
padding-bottom: 2em;
}
.post-title {
font-size: 2em;
color: #222;
margin-bottom: 0.2em;
}
.post-avatar {
border-radius: 50px;
float: right;
margin-left: 1em;
}
.post-description {
font-family: Georgia, "Cambria", serif;
color: #444;
line-height: 1.8em;
}
.post-meta {
color: #999;
font-size: 90%;
margin: 0;
}

.post-category {
margin: 0 0.1em;
padding: 0.3em 1em;
color: #fff;
background: #999;
font-size: 80%;
}
.post-category-design {
background: #5aba59;
}
.post-category-pure {
background: #4d85d1;
}
.post-category-yui {
background: #8156a7;
}
.post-category-js {
background: #df2d4f;
}

.post-images {
margin: 1em 0;
}
.post-image-meta {
margin-top: -3.5em;
margin-left: 1em;
color: #fff;
text-shadow: 0 1px 1px #333;
}

.footer {
text-align: center;
padding: 1em 0;
}
.footer a {
color: #ccc;
font-size: 80%;
}
.footer .pure-menu a:hover,
.footer .pure-menu a:focus {
background: none;
}

@media (min-width: 48em) {
.content {
padding: 2em 3em 0;
margin-left: 25%;
}

.header {
margin: 80% 2em 0;
text-align: right;
}

.sidebar {
position: fixed;
top: 0;
bottom: 0;
}
}

.main-content-pagitor  {
width: 50%;
padding: 10px 20px 5px 20px;
overflow: auto;
margin: auto;
/*position: relative;*/
text-align: center;
}
.main-content-pagitor a {
color: #cccccc;
padding: 0 5px 0 5px;
}
.main-content-pagitor span {
color: #585858;

/*padding: 20px 20px 20px 20px;*/

}

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