python操作三大主流数据库(14)python操作redis之新闻项目实战②新闻数据的展示及修改、删除操作
python操作三大主流数据库(14)python操作redis之新闻项目实战②新闻数据的展示及修改、删除操作
项目目录:
├── flask_redis_news.py
├── forms.py
├── init_news.py
├── redis_news.py
├── static
│ ├── bootstrap-3.3.-dist
│ │ ├── css
│ │ ├── fonts
│ │ └── js
│ ├── bootstrap-3.3.-dist.zip
│ ├── datatables.min.css
│ ├── datatables.min.js
│ ├── img
│ │ └── news
│ ├── index.css
│ ├── jquery-3.3..min.js
│ └── main.css
├── templates
│ ├── admin
│ │ ├── add.html
│ │ ├── admin_base.html
│ │ ├── index.html
│ │ └── update.html
│ ├── cat.html
│ ├── detail.html
│ ├── home_base.html
│ └── index.html
1.服务端代码flask_redis_news.py
#coding:utf-8 import sys
defaultencoding = 'utf-8'
if sys.getdefaultencoding() != defaultencoding:
reload(sys)
sys.setdefaultencoding(defaultencoding)
import os
from datetime import datetime
from werkzeug import secure_filename
from flask import Flask, request, render_template, redirect, flash, url_for, abort
from flask_uploads import UploadSet, configure_uploads, IMAGES, patch_request_class from forms import NewsForm
from redis_news import RedisNews app = Flask(__name__)
app.config['SECRET_KEY'] = 'adfa@4314#31AD23#2'
app.config['UPLOADED_PHOTOS_DEST'] = "/data/three_db_python/redis_version01/static/img/news"
query = RedisNews() photos = UploadSet('photos', IMAGES)
configure_uploads(app, photos) patch_request_class(app) # set maximum file size, default is 16MB @app.route("/", methods = ['GET'])
def index():
''' 获取新闻列表 '''
news_list = query.get_all_news()
return render_template("index.html", news_list = news_list) @app.route("/cat/<name>/", methods = ['GET'])
def cat(name):
''' 获取新闻列表 '''
news_list = query.get_news_from_cat(name)
return render_template("cat.html", news_list = news_list) @app.route("/detail/<int:pk>/", methods = ['GET'])
def detail(pk):
''' 获取新闻列表 '''
news_obj = query.get_news_from_id(pk)
return render_template("detail.html", obj = news_obj) @app.route("/admin/", methods = ['GET'])
@app.route("/admin/<int:page>/", methods = ['GET'])
def admin(page = None):
''' 获取后台新闻列表 '''
if page is None:
page = 1
page_data = query.paginate(page, 5)
return render_template("admin/index.html", page_data = page_data) @app.route("/admin/add/", methods = ['GET','POST'])
def admin_add():
''' 从后台页面添加新闻 '''
form = NewsForm()
news_obj = {}
# 提交增加
if form.validate_on_submit():
# 图片文件名
filename = photos.save(form.photo.data) news_obj['title'] = form.title.data
news_obj['news_type'] = form.news_type.data
news_obj['img_url'] = form.img_url.data
news_obj['content'] = form.content.data
news_obj['created_at'] = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
news_obj['updated_at'] = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
query.add_new_from_page(news_obj)
flash('添加成功')
return redirect(url_for('admin')) return render_template("admin/add.html", form = form) @app.route("/admin/update/<int:pk>/", methods = ['GET','POST'])
def admin_update(pk):
''' 获取后台新闻列表 '''
# 获取新闻
news_obj = query.get_news_from_id(pk)
if news_obj is None:
abort('no this news')
form = NewsForm(data = news_obj) # 提交修改
if form.validate_on_submit():
news_obj['title'] = form.title.data
news_obj['news_type'] = form.news_type.data
news_obj['img_url'] = form.img_url.data
news_obj['content'] = form.content.data
news_obj['updated_at'] = datetime.now().strftime('%Y-%m-%d %H:%M:%S') query.update_news(pk, news_obj) flash('新闻修改成功')
return redirect(url_for('admin'))
return render_template("admin/update.html", form = form) @app.route("/admin/delete/<int:pk>/", methods = ['GET','POST'])
def admin_delete(pk):
''' 删除新闻 '''
news_obj = query.get_news_from_id(pk)
if news_obj:
query.delete_news(pk, news_obj)
return 'yes' return 'no' if __name__ == "__main__":
app.run(debug = True,host="0.0.0.0")
2.辅助类新闻的具体操作redis_news.py
#coding:utf-8 import math
import redis NEWS_FIELDS = (
"title",
"img_url",
"content",
"is_valid",
"news_type",
"created_at",
"updated_at"
) class RedisNews(object):
def __init__(self):
# 如果返回是二进制类似 b'3\xe6\x9c\x885\xe6\x97\xa5\xe...'需要加decode_responses=True
try:
self.r = redis.StrictRedis(host = 'localhost',
port=6379,encoding='utf-8',
decode_responses=True,
db=1)
except Exception as e:
print('redis connect faild') def _news_id(self, int_id):
''' 新闻id '''
return 'news:%d' % int(int_id) def _news_type(self, news_type):
''' 新闻类型 '''
return 'news_type:%s' % news_type def _news_list_name(self):
''' 新闻列表名称 '''
return 'news' def add_new_from_page(self, news_obj):
''' 从页面新增新闻数据 ''' # 记录news_id的数字自增1
int_id = self.r.incr('news_id', amount=1)
# 获取新闻id
news_id = self._news_id(int_id) # 新闻列表中添加
self.r.lpush(self._news_list_name(), int_id) # 新闻类型中添加信息
news_type = news_obj['news_type']
self.r.sadd(news_type, int_id) # 新闻内容中添加信息
self.r.hmset(news_id, news_obj) def add_news(self, news_obj):
''' 新增新闻数据 '''
# 获取到新闻的id
int_id = int(self.r.incr('news_id'))
# 拼接新闻数据Hash key(news:2)
news_id = self._news_id(int_id) # 存储新闻数据(hash)
rest = self.r.hmset(news_id, news_obj) # 存储新闻的id list
self.r.lpush(self._news_list_name(), int(int_id)) # 存储新闻的类别-新闻id(set)
news_type = _news_type(news_obj['news_type'])
self.r.sadd(news_type, int_id)
return rest def add_news_with_transaction(self, news_obj):
''' 使用事务来新增新闻数据 '''
pipe = self.r.pipeline(transaction=True)
int_id = self.r.incr('news_id')
news_id = self._news_id(int_id) # 使用列表list获取新闻的id
pipe.lpush(self._news_list_name(), int_id) # 使用hash来保存新闻具体内容
pipe.hmset(news_id, news_obj) # 使用hash来保存新闻分类信息
news_type = self._news_type(news_obj['news_type'])
pipe.sadd(news_type, int_id) rest = pipe.execute()
return rest def get_all_news(self):
''' 获取所有新闻信息 ''' # 获取id列表
id_list = self.r.lrange(self._news_list_name(), 0, -1)
data_list = [] for int_id in id_list:
# 获取具体新闻内容
news_id = self._news_id(int_id)
data = self.r.hgetall(news_id)
data['id'] = int_id
# print(data)
data_list.append(data) return data_list def get_news_from_id(self, news_id):
''' 根据新闻id获取新闻内容 '''
news_id = self._news_id(news_id) # 根据新闻id获取新闻内容
news_obj = self.r.hgetall(news_id)
return news_obj def get_news_from_cat(self, cat_name):
''' 根据新闻类型获取新闻内容 '''
news_list = [] # 获取新闻类型
news_type = self._news_type(cat_name)
# print(news_type)
# 获取新闻类型集合中新闻id的列表
id_list = self.r.smembers(news_type)
print(id_list)
for int_id in id_list:
# 获取新闻id
news_id = self._news_id(int_id)
# 根据新闻id获取新闻内容
data = self.r.hgetall(news_id)
data['id'] = int_id
news_list.append(data)
return news_list def update_news(self, pk, news_obj):
''' 新闻的修改 '''
news_id = self._news_id(pk) # 修改新闻
rest = self.r.hmset(news_id, news_obj)
return rest def delete_news(self, pk, news_obj):
'''
新闻的删除,物理删除 关于常用的方法可以通过查询redis的命令类型判断是list,string还是hash或者set
1.命令列表定位到具体命令:http://www.redis.cn/commands.html#hash
2.找到命令后,查询api的用法http://redis-py.readthedocs.io/en/latest/ ''' # 获取新闻id
news_id = self._news_id(pk)
# 从新闻列表中删除新闻id
self.r.lrem(self._news_list_name(), 0, pk)
# 从新闻的类型set集合中清理新闻id
news_type = self._news_type(news_obj['news_type'])
self.r.srem(news_type, pk)
# 从新闻的内容hash列表中清理具体的新闻内容NEWS_FIELDS(具体的列信息)
self.r.hdel(news_id, *NEWS_FIELDS) def paginate(self, page=1, per_page=5):
''' 新闻后台分页 '''
if page is None:
page = 1 data_list = []
# 开始页,结束页面
start = (page - 1)*per_page
end = page*per_page - 1 # 获取所有新闻列表(计算页码使用)
list_ids = self.r.lrange(self._news_list_name(), 0, -1) # 获取新闻列表
id_list = self.r.lrange(self._news_list_name(), start, end)
# print('id_list%s' % id_list) for int_id in id_list:
news_id = self._news_id(int_id)
# 根据新闻id获取新闻内容
data = self.r.hgetall(news_id)
data['id'] = int_id
data_list.append(data)
# print('data_list%s' % data_list)
return Pagenation(data_list, page, per_page, list_ids) def init_news(self, data_list):
''' 批量导入新闻数据 '''
for news_obj in data_list:
rest = self.add_news_with_transaction(news_obj)
print(rest) class Pagenation(object):
''' 分页类 '''
def __init__(self, data_list, now_page, per_page, list_ids):
self.now_page = now_page
self.data_list = data_list
self.per_page = per_page
self.list_ids = list_ids @property
def page(self):
''' 当前页 '''
return self.now_page @property
def items(self):
''' 返回页面数据 '''
return self.data_list @property
def prev_num(self):
''' 上一页 '''
return self.now_page - 1 @property
def next_num(self):
''' 下一页页码 '''
return self.now_page + 1 @property
def has_prev(self):
''' 是否有上一页 '''
return self.now_page > 1 @property
def has_next(self):
''' 是否有下一页 '''
return self.per_page == len(self.data_list) def iter_pages(self):
''' 页码 '''
# 获取所有的id长度(即新闻条数)除以每页显示的页面,得到取进一位的整数
total_page = math.ceil(len(self.list_ids)/self.per_page)
# print('total_page=%d' % total_page)
return range(1, total_page)
3.表单类forms.py
from flask_wtf import FlaskForm
from wtforms import StringField, TextAreaField, SubmitField, SelectField
from flask_wtf.file import FileField, FileRequired, FileAllowed
from wtforms.validators import DataRequired class NewsForm(FlaskForm):
"""新闻表单数据验证"""
title = StringField(label = '新闻标题', validators = [DataRequired('请输入标题')],
description = '请输入标题',
render_kw={'required':'required', 'class':'form-control'})
content = TextAreaField(label = '新闻内容', validators = [DataRequired('请输入新闻内容')],
description = '请输入新闻内容',
render_kw={'required':'required', 'class':'form-control'})
news_type = SelectField('新闻类型', choices = [('推荐','推荐'), ('百家', '百家'),('本地','本地'), ('图片','图片')])
img_url = StringField(label='新闻图片', description='请输入图片地址',
render_kw={'required':'required', 'class':'form-control'})
photo = FileField('图片上传', validators=[FileAllowed(['png', 'JPEG', 'jpg'], '只能上传图片!'),
FileRequired('文件未选择!')])
submit = SubmitField('提交')
4.前台展示页面
①模板home_base.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"> <link rel="stylesheet" href="{{ url_for('static', filename='bootstrap-3.3.7-dist/css/bootstrap.min.css')}}">
<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='main.css')}}">
<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='datatables.min.css')}}">
<script type="text/javascript" src="{{ url_for('static', filename='jquery-3.3.1.min.js')}}"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#example').DataTable();
} );
</script>
{% block head %}
<title>首页</title>
{% endblock %}
</head>
<body>
<div class="container">
<h1>新闻列表</h1>
<nav class="navbar navbar-inverse">
<!-- 页面头部 -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar-menu" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button> </div>
<div id="navbar-menu" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="/">首页</a></li>
<li><a href="{{url_for('cat', name='推荐')}}">推荐</a></li>
<li><a href="{{url_for('cat', name='百家')}}">百家</a></li>
<li><a href="{{url_for('cat', name='本地')}}">本地</a></li>
<li><a href="{{url_for('cat', name='图片')}}">图片</a></li>
</ul>
</div>
</nav> <!-- 新闻内容部分 -->
{% block content %}
<!-- 内容区域 -->
{% endblock %} </div>
{% block extrajs %}
<!-- 其他脚本 -->
{% endblock %}
</body>
</html>
②首页index.html
{% extends 'home_base.html' %}
{% block content%} <div id="content" class="row-fluid">
<div class="col-md-12">
<table id="example" class="table table-striped table-bordered" cellspacing="0" width="100%">
<thead>
<tr>
<th>图片</th>
<th>简介</th>
</tr>
</thead>
<tbody>
{% for obj in news_list %}
<tr>
<td>
<img width=120 height=60 src="{{ obj.img_url }}" alt="图片">
</td>
<td>
<p>
<a href="{{ url_for('detail', pk=obj.id) }}">{{ obj.title }}</a>
<small>{{ obj.created_at }}</small>
</p>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</div>
</div>
{% endblock %}
{% block extrajs %}
<script type="text/javascript" src="{{ url_for('static', filename = 'datatables.min.js')}}"></script>
{% endblock %}
③详情页detail.html
{% extends 'home_base.html' %} {% block head %}
<title>新闻详情</title>
{% endblock %}
{% block content%} <div id="content" class="row-fluid">
<div class="col-md-9">
<h2>新闻详情,来自新闻id> {{obj.id}}</h2> </div> <div class="col-md-12">
<table id="example" class="table table-striped table-bordered" cellspacing="0" width="100%">
<thead>
<tr>
<th>{{ obj.content }}</th>
</tr>
</thead> <tbody> <tr>
<td>
<img width=600 height=500 src="{{ obj.img_url }}" alt="图片">
</td>
<td>
</tr> <tr> <td>
<p>
{{ obj.title }}
<small>{{ obj.created_at }}</small>
</p>
</td>
</tr> </tbody>
</table>
</div> </div> </div>
{% endblock %}
</body>
</html>
④分类页面cat.html
{% extends 'home_base.html' %}
{% block head%}
<title>{{ name }}</title>
{% endblock %}
{% block content%} <div id="content" class="row-fluid">
<div class="col-md-12">
<table id="example" class="table table-striped table-bordered" cellspacing="0" width="100%">
<thead>
<tr>
<th>图片</th>
<th>简介</th>
</tr>
</thead>
<tbody>
{% for obj in news_list %}
<tr>
<td>
<img width=120 height=60 src="{{ obj.img_url }}" alt="图片">
</td>
<td>
<p>
<a href="{{ url_for('detail', pk=obj.id) }}">{{ obj.title }}</a>
<small>{{ obj.created_at }}</small>
</p>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</div>
</div>
{% endblock %}
{% block extrajs %}
<script type="text/javascript" src="{{ url_for('static', filename = 'datatables.min.js')}}"></script>
{% endblock %}
5.后台管理页面
①后台模板页面admin/admin_base.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='bootstrap-3.3.7-dist/css/bootstrap.min.css')}}">
{% block head %}
<title>首页</title>
{% endblock %}
</head>
<body>
<!-- 导航栏 -->
<div class="container">
<div class="row">
<div class="bs-example" data-example-id="default-navbar">
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="{{ url_for('admin_add')}}">添加新闻</a>
</div> <!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<form class="navbar-form navbar-left">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav> <!-- 新闻内容部分 -->
{% block content %}
<!-- 内容区域 -->
{% endblock %}
</div>
{% block extrajs %}
<!-- 其他脚本 -->
{% endblock %}
</body>
</html>
②后台首页admin/index.html
{% extends 'admin/admin_base.html' %}
{% block head %}
<title>新闻后台首页</title>
{% endblock %}
{% block content %}
<!-- 消息闪现 -->
{% for msg in get_flashed_messages() %}
<p class="bg-success">{{msg}}</p>
{% endfor %} <!-- 表格,存放新闻具体内容 -->
<table class="table table-hover"> <tr class="info">
<th>编号</th>
<th>新闻标题</th>
<th>类别</th>
<th>添加时间</th>
<th>操作</th>
</tr>
{% for new_obj in page_data.items %}
<tr class="active">
<td>{{ new_obj.id }}</td>
<td>{{ new_obj.title }}</td>
<td>{{new_obj.types }}</td>
<td>{{new_obj.created_at }}</td>
<td><a href="{{url_for('admin_update', pk = new_obj.id)}}" class='btn btn-success'>修改</a><a data-url="{{ url_for('admin_delete', pk=new_obj.id) }}" class='btn btn-danger'>删除</a></td>
</tr>
{% endfor %}
</table> <!-- 分页,默认分页 --> <nav aria-label="Page navigation">
<ul class="pagination">
{% if page_data.has_prev %}
<li>
<a href="{{ url_for('admin', page=page_data.prev_num) }}" aria-label="Previous">
<span aria-hidden="true">«</span>
</a>
</li>
{% else %}
<li class="disabled"><a href="javascipt:;">»</a></li>
{% endif %}
{% for page in page_data.iter_pages() %}
{% if page == page_data.page %}
<li class="active">
<a href="javascript:;">{{ page }}</a>
</li>
{% else %}
<li>
<a href="{{ url_for('admin', page=page) }}">{{ page }}</a>
</li>
{% endif %}
{% endfor %} {% if page_data.has_next %}
<li>
<a href="{{ url_for('admin', page=page_data.next_num) }}">»</a>
</li>
{% else %}
<li class="disabled">
<a href="javascript:;">»</a>
</li>
{% endif %}
</ul>
</nav> </div>
</div>
{% endblock %}
{% block extrajs %}
<script type="text/javascript" src="{{ url_for('static', filename='jquery-3.3.1.min.js') }}"></script>
<script type="text/javascript">
// 通过ajax异步删除新闻
$(function(){
$('.btn-danger').on('click', function(){
var _this = $(this)
var url = _this.attr('data-url')
// 弹框确认是否删除
if (confirm('确认删除吗?')){
// ajax发送post请求
$.post(url, function(res){
if(res == 'yes'){
// 如果后台删除成功则隐藏该行
_this.parents('tr').hide()
}else{
alert('删除失败');
}
})
} })
})
</script>
{% endblock %}
</body>
</html>
③后台添加页面admin/add.html
{% extends 'admin/admin_base.html' %}
{% block head %}
<title>新闻添加页面</title>
{% endblock %}
{% block content %} <!-- 添加新闻内容 -->
<form action="/admin/add/" method="post" enctype="multipart/form-data">
<div class="form-group">
<label for="exampleInputEmail1">{{ form.title.label.text }}</label>
<input type="text" name="title" class="form-control" id="exampleInputEmail1" placeholder="news title">
</div>
<div class="form-group">
<label for="exampleInputPassword1">{{ form.news_type.label.text }}</label>
<div>
{{ form.news_type }}
</div>
</div>
<div class="form-group">
{{ form.photo }}
{% for error in form.photo.errors %}
<span style="color: red;">{{ error }}</span>
{% endfor %}
<p class="help-block">新闻图片上传</p>
</div>
<div class="form-group">
<p class="help-block">新闻图片的路径</p>
{{ form.img_url }}
</div>
<div class="form-group">
{{ form.content }}
</div> <br>
{{ form.csrf_token }}
{{ form.submit }}
</form>
{% endblock %}
</body>
</html>
④后台新闻更新页面admin/update.html
{% extends 'admin/admin_base.html' %}
{% block head %}
<title>修改新闻</title>
{% endblock %}
{% block content %} <form role='form' class="form-horizontal" method="post">
<div class="form-group">
<label for="exampleInputEmail1">{{ form.title.label.text }}</label>
<div>
{{form.title}}
</div>
</div>
<div class="form-group">
<label for="exampleInputPassword1">{{ form.news_type.label.text }}</label>
<div>
{{ form.news_type }}
</div>
</div>
<div class="form-group">
<label for="exampleInputFile">{{ form.img_url.label.text }}</label>
<input type="file" name="image" id="exampleInputFile">
{{ form.img_url }}
<!-- <p class="help-block">新闻图片上传</p> -->
</div>
<div class="form-group">
{{ form.content }}
</div> <br>
{{ form.csrf_token }}
{{ form.submit }} </form> {% endblock %}
</body>
</html>
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