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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>商伟的技术博客</title>
<meta name="description" content="">
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<a class="brand" href="/">商伟的技术博客</a>
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<p class="pull-right"><a href="/archives.html">[archives]</a> <a href="/tags.html">[tags]</a></p>
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<h3>Blogroll</h3>
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<h3>Social</h3>
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<div class="content">
<div class="page-header"><h1> 商伟的技术博客 </h1></div>
<div class='article'>
<h2>创建与使用虚拟环境</h2>
<div class="well small">Permalink: <a class="more" href="/创建与使用虚拟环境.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/xu-ni-huan-jing.html">虚拟环境</a>
tags: <a href="/tag/xu-ni-huan-jing.html">虚拟环境</a> </div>
<div class="summary"><h2>创建与使用环境</h2>
<div class="highlight"><pre><span></span><span class="o">#</span> <span class="err">安装</span><span class="p">:</span>
<span class="n">pip</span> <span class="n">install</span> <span class="n">virtualenvwrapper</span><span class="o">-</span><span class="n">win</span>
</pre></div>
<div class="highlight"><pre><span></span><span class="o">#</span> <span class="err">常用命令</span><span class="p">:</span>
<span class="n">mkvirtualenv</span> <span class="n">envname</span> <span class="o">#</span> <span class="err">创建虚拟环境并自动切换到该环境下</span>
<span class="n">workon</span> <span class="n">envname</span> <span class="o">#</span> <span class="err">切换到某虚拟环境下</span>
<span class="n">pip</span> <span class="n">list</span> <span class="o">#</span> <span class="err">查看蓄奴环境下的安装包</span>
<span class="n">rmvirtualenv</span> <span class="n">envname</span> <span class="o">#</span> <span class="err">删除虚拟环境</span>
<span class="n">deactivate</span> <span class="o">#</span> <span class="err">退出虚拟环境</span>
<span class="n">lsvirtualenv</span> <span class="o">&</span> <span class="n">workon</span> <span class="o">#</span> <span class="err">列出所有常见的虚拟环境</span>
<span class="n">mkvirtualenv</span> <span class="c1">--python==C:\...\python.exe envname # 指定Python解释器创建虚拟环境</span>
</pre></div> <a class="btn primary xsmall" href="/创建与使用虚拟环境.html">more…</a>
</div>
</div>
<div class='article'>
<h2>初识MySQL</h2>
<div class="well small">Permalink: <a class="more" href="/初识MySQL.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/mysql.html">MySQL</a>
tags: <a href="/tag/mysql.html">MySQL</a> </div>
<div class="summary"><h4>1.为什么学习数据库</h4>
<div class="highlight"><pre><span></span>数据的存储方式大致有内存存储, 文件存储, 数据库存储. 其中内存存储有断电消失的特性, 不适合永久保存数据. 文件存储不利于数据的查询有调用.所以采用数据库形式存储数据.
数据库具有以下优点:
1).持久化数据到本地
2).可以实现结构化查询, 方便管理数据
</pre></div>
<h4>2.数据库相关概念</h4>
<div class="highlight"><pre><span></span> (1).DB : 数据库, 英文全称为DataBase. 是存储数据的仓库, 其中保存了一系列有组织的数据.
(2).DBMS : 数据库管理系统, 英文全称为Database Management System. 数据库是通过DBMS常见和操作的容器.常见数据库管理系统 : MySQL, Oracle, DB2(适合处理海量数据), SQLServer
(3).SQL : 结构化查询语言(Structure Query Language), 专门用来与数据库通信的语言.
</pre></div>
<h4>3.SQL的优点:</h4>
<div class="highlight"><pre><span></span> (1).不是某个特定数据库供应商专有的语言, 几乎所有DBMS都支持SQL
(2).简单易学 …</pre></div> <a class="btn primary xsmall" href="/初识MySQL.html">more…</a>
</div>
</div>
<div class='article'>
<h2>如何安装mongodb</h2>
<div class="well small">Permalink: <a class="more" href="/如何安装mongodb.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/mongodb.html">Mongodb</a>
tags: <a href="/tag/mongodb.html">Mongodb</a> </div>
<div class="summary"><h5>创建一个<code>/etc/yum.repos.d/mongodb-org-4.2.repo</code>文件，以便您可以使用<code>yum</code>以下命令直接安装MongoDB ：</h5>
<div class="highlight"><pre><span></span>touch /etc/yum.repos.d/mongodb-org-4.2.repo
</pre></div>
<h5>编写</h5>
<div class="highlight"><pre><span></span>[mongodb-org-4.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4 …</pre></div> <a class="btn primary xsmall" href="/如何安装mongodb.html">more…</a>
</div>
</div>
<div class='article'>
<h2>如何安装python3</h2>
<div class="well small">Permalink: <a class="more" href="/如何安装python3.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/python.html">Python</a>
tags: <a href="/tag/python.html">Python</a> </div>
<div class="summary"><h5>CentOS7下安装python3</h5>
<p>yun安装</p>
<div class="highlight"><pre><span></span>yum install python3
# 下面的命令是用来解决找不到python.h
yum list |grep python3 |grep devel
yum install python3-devel.x86_64
</pre></div>
<p>1、安装pyhton3.7 的依赖包</p>
<div class="highlight"><pre><span></span>yum -y groupinstall "Development tools"
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel libffi-devel
</pre></div>
<p>2、下载python3.7的“源码”：</p>
<div class="highlight"><pre><span></span>wget https://www.python.org …</pre></div> <a class="btn primary xsmall" href="/如何安装python3.html">more…</a>
</div>
</div>
<div class='article'>
<h2>微信小程序发起请求</h2>
<div class="well small">Permalink: <a class="more" href="/微信小程序发起请求.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/xiao-cheng-xu.html">小程序</a>
tags: <a href="/tag/xiao-cheng-xu.html">小程序</a> </div>
<div class="summary"><h4>发起请求</h4>
<h5>发起请求使用的是wx.request相当于axios或者ajax，发起的请求</h5>
<p>官方文档 <a href="https://developers.weixin.qq.com/miniprogram/dev/api/network/request/wx.request.html">https://developers.weixin.qq.com/miniprogram/dev/api/network/request/wx.request.html</a></p>
<h5>代码</h5>
<div class="highlight"><pre><span></span><button <span class="nv">bindtap</span><span class="o">=</span><span class="s1">'click'</span>>按钮1</button> <span class="c1">#点击按钮触发click事件</span>
</pre></div>
<div class="highlight"><pre><span></span> <span class="n">click</span><span class="p">:</span><span class="n">function</span><span class="p">(){</span>
<span class="n">var</span> <span class="n">thit</span> <span class="o">=</span> <span class="n">this</span>
<span class="n">wx</span><span class="o">.</span><span class="n">request</span><span class="p">({</span>
<span class="n">url</span><span class="p">:</span> <span class="s1">'http://127.0.0.1:8000/app01/a/'</span><span class="p">,</span> <span class="c1">#访问的路由</span>
<span class="n">data</span><span class="p">:{</span><span class="s1">'name'</span><span class="p">:</span><span class="s1">'shang'</span><span class="p">},</span> <span class="c1">#传参</span>
<span class="n">method</span><span class="p">:</span><span class="s2">"POST"</span><span class="p">,</span> <span class="c1">#提交方式</span>
<span class="n">header …</span></pre></div> <a class="btn primary xsmall" href="/微信小程序发起请求.html">more…</a>
</div>
</div>
<div class='article'>
<h2>网络</h2>
<div class="well small">Permalink: <a class="more" href="/网络.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/wang-luo.html">网络</a>
tags: <a href="/tag/wang-luo.html">网络</a> </div>
<div class="summary"><h2>OSI七层协议</h2>
<table>
<thead>
<tr>
<th>-</th>
<th>-</th>
</tr>
</thead>
<tbody>
<tr>
<td>物理层</td>
<td></td>
</tr>
<tr>
<td>数据层</td>
<td>rarp、arp</td>
</tr>
<tr>
<td>网络层</td>
<td>ip、IPv4、IPv6</td>
</tr>
<tr>
<td>传输层</td>
<td>tcp、udp</td>
</tr>
<tr>
<td>会话层</td>
<td></td>
</tr>
<tr>
<td>表示层</td>
<td></td>
</tr>
<tr>
<td>应用层</td>
<td>Ftp、ssh、http</td>
</tr>
</tbody>
</table>
<h2>HTTP协议</h2>
<h3>无状态</h3>
<ul>
<li>没有记忆功能，服务器不知道客户端是什么状态</li>
<li>解决办法：session，cookie</li>
</ul>
<h3>无连接</h3>
<ul>
<li>每次链接只处理一个请求，然后断开链接</li>
<li>解决办法：</li>
<li>轮询</li>
<li>长轮询</li>
<li>websocket</li>
</ul>
<h2>轮询</h2>
<ul>
<li>客户端定时向服务器发起请求，服务器接到请求后马上返回响应信息并关闭连接。</li>
<li>优点：后端编写程序容易</li>
<li>缺点：请求中有大半是无用，浪费带宽和服务器资源。</li>
<li>适用于小型应用</li>
</ul>
<h2>长轮询</h2>
<ul>
<li>客户端向服务器发起请求，服务器接到请求后hold住连接，直到有新消息才返回响应信息并关闭连接，客户端处理完响应信息后再向服务器发送新的请求。</li>
<li>优点：在无消息的情况下不会频繁的请求。</li>
<li>缺点：服务器hold连接会消耗资源 …</li></ul> <a class="btn primary xsmall" href="/网络.html">more…</a>
</div>
</div>
<div class='article'>
<h2>软连接</h2>
<div class="well small">Permalink: <a class="more" href="/软链接.html">1000-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/sui-shou-bi-ji.html">随手笔记</a>
tags: <a href="/tag/sui-shou-bi-ji.html">随手笔记</a> </div>
<div class="summary"><div class="highlight"><pre><span></span>增加
ln-s 源文件 软连接名
修改
ln –snf 源文件 软连接
删除
只删除软连接
rm -rf 软连接名
只删除源文件
rm -rf 源文件
-r循环
-f强制
</pre></div> <a class="btn primary xsmall" href="/软链接.html">more…</a>
</div>
</div>
<div class='article'>
<h2>Python-链接WIFI</h2>
<div class="well small">Permalink: <a class="more" href="/Python-链接WIFI.html">0999-01-01 18:44:00+00:09</a>
by <a class="url fn" href="/author/shang-wei.html">商伟 </a>
in <a href="/category/python.html">Python</a>
tags: <a href="/tag/python.html">Python</a> </div>
<div class="summary"><h4>生成密码字段</h4>
<div class="highlight"><pre><span></span><span class="c1"># -*- coding: utf-8 -*-</span>
<span class="kn">import</span> <span class="nn">itertools</span> <span class="kn">as</span> <span class="nn">its</span>
<span class="c1"># 单个字符的集合</span>
<span class="n">words</span><span class="o">=</span><span class="s2">"0123456789"</span>
<span class="c1"># 每次任选一个字符，重复8次</span>
<span class="n">arrays</span> <span class="o">=</span> <span class="n">its</span><span class="o">.</span><span class="n">product</span><span class="p">(</span><span class="n">words</span><span class="p">,</span> <span class="n">repeat</span> <span class="o">=</span> <span class="mi">8</span><span class="p">)</span>
<span class="c1"># 写入txt文本文件</span>
<span class="n">dictionary</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s2">"C:/Users/Administrator/Desktop/dictionary.txt"</span><span class="p">,</span><span class="s2">"a"</span><span class="p">)</span>
<span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">arrays</span><span class="p">:</span>
<span class="c1"># 一行密码</span>
<span class="n">dictionary</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s2">""</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">item</span><span class="p">))</span>
<span class="c1"># 换行</span>
<span class="n">dictionary</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s2">""</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s2">"</span><span class="se">\n</span><span class="s2">"</span><span class="p">))</span>
<span class="k">print</span><span class="p">(</span><span class="n">item</span><span class="p">)</span>
<span class="c1"># 关闭文件</span>
<span class="n">dictionary</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">print</span><span class="p">(</span><span class="s2">"[mission completion …</span></pre></div> <a class="btn primary xsmall" href="/Python-链接WIFI.html">more…</a>
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