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Django工程读取mongodb并使用分页器

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 &ndash; Layout Examples &ndash; 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&#x27;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 &ndash; Layout Examples &ndash; 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&#x27;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 &ndash; Layout Examples &ndash; 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&#x27;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- 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- 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  {
     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;*/

}

查看全文

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原文地址：https://www.cnblogs.com/kylinlin/p/5184934.html