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<!DOCTYPE html>
<html class="theme-next pisces use-motion" lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="generator" content="Hexo 3.8.0">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
<meta name="theme-color" content="#222">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png?v=7.3.0">
<link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png?v=7.3.0">
<link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png?v=7.3.0">
<link rel="mask-icon" href="/images/logo.svg?v=7.3.0" color="#222">
<link rel="stylesheet" href="/css/main.css?v=7.3.0">
<link rel="stylesheet" href="/lib/font-awesome/css/font-awesome.min.css?v=4.7.0">
<script id="hexo.configurations">
var NexT = window.NexT || {};
var CONFIG = {
root: '/',
scheme: 'Pisces',
version: '7.3.0',
sidebar: {"position":"left","display":"post","offset":12,"onmobile":false},
back2top: {"enable":true,"sidebar":false,"scrollpercent":false},
copycode: {"enable":false,"show_result":false,"style":null},
fancybox: false,
mediumzoom: false,
lazyload: false,
pangu: false,
algolia: {
applicationID: '',
apiKey: '',
indexName: '',
hits: {"per_page":10},
labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
},
localsearch: {"enable":false,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},
search: {
root: '/',
path: 'search.xml'
},
tabs: true,
motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
translation: {
copy_button: '复制',
copy_success: '复制成功',
copy_failure: '复制失败'
}
};
</script>
<meta property="og:type" content="website">
<meta property="og:title" content="不知名的程序员">
<meta property="og:url" content="https://leiyuanpu.github.io/index.html">
<meta property="og:site_name" content="不知名的程序员">
<meta property="og:locale" content="zh-CN">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="不知名的程序员">
<link rel="canonical" href="https://leiyuanpu.github.io/">
<script id="page.configurations">
CONFIG.page = {
sidebar: "",
};
</script>
<title>不知名的程序员</title>
<noscript>
<style>
.use-motion .motion-element,
.use-motion .brand,
.use-motion .menu-item,
.sidebar-inner,
.use-motion .post-block,
.use-motion .pagination,
.use-motion .comments,
.use-motion .post-header,
.use-motion .post-body,
.use-motion .collection-title { opacity: initial; }
.use-motion .logo,
.use-motion .site-title,
.use-motion .site-subtitle {
opacity: initial;
top: initial;
}
.use-motion .logo-line-before i { left: initial; }
.use-motion .logo-line-after i { right: initial; }
</style>
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<div class="header-inner"><div class="site-brand-wrapper">
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<a href="/" class="brand" rel="start">
<span class="logo-line-before"><i></i></span>
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<span class="logo-line-after"><i></i></span>
</a>
</div>
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<div class="site-nav-toggle">
<button aria-label="切换导航栏">
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<a href="/archives/" rel="section"><i class="menu-item-icon fa fa-fw fa-archive"></i> <br>归档</a>
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<link itemprop="mainEntityOfPage" href="https://leiyuanpu.github.io/2020/07/26/Nginx跨域配置/">
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<a href="/2020/07/26/Nginx跨域配置/" class="post-title-link" itemprop="url">Nginx跨域配置</a>
</h1>
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<time title="创建时间：2020-07-26 15:37:06" itemprop="dateCreated datePublished" datetime="2020-07-26T15:37:06+08:00">2020-07-26</time>
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<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2020-07-27 09:01:01" itemprop="dateModified" datetime="2020-07-27T09:01:01+08:00">2020-07-27</time>
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">erver {</span><br><span class="line"> listen 81 default_server;</span><br><span class="line"> listen [::]:81 default_server;</span><br><span class="line"> server_name _;</span><br><span class="line"> #root /home/crm_ui_test/dist;</span><br><span class="line"></span><br><span class="line"> access_log /home/nginx/log/crm_ui_dev_access.log main;</span><br><span class="line"></span><br><span class="line"> # Load configuration files for the default server block.</span><br><span class="line"> #include /etc/nginx/default.d/*.conf;</span><br><span class="line"> location / {</span><br><span class="line"></span><br><span class="line"> root /home/crm_ui_dev/dist;</span><br><span class="line"> try_files $uri $uri/ /index.html;</span><br><span class="line"> index index.html index.htm;</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> location /server {</span><br><span class="line"></span><br><span class="line"> proxy_set_header Host $host;</span><br><span class="line"> proxy_set_header X-Real-IP $remote_addr; #»ñÈ¡Õæʵip</span><br><span class="line"> proxy_connect_timeout 90;</span><br><span class="line"> proxy_send_timeout 90;</span><br><span class="line"> proxy_read_timeout 90;</span><br><span class="line"> proxy_buffer_size 4k;</span><br><span class="line"> proxy_buffers 4 32k;</span><br><span class="line"> proxy_busy_buffers_size 64k;</span><br><span class="line"> proxy_temp_file_write_size 64k;</span><br><span class="line"> proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;#»ñÈ¡´úÀíÕßµÄÕæʵip</span><br><span class="line"> proxy_redirect off;</span><br><span class="line"> proxy_pass http://127.0.0.1:85/;</span><br><span class="line">}</span><br><span class="line">}</span><br><span class="line"> server_name localhost;</span><br><span class="line"> root /home/crm_server_dev/public;</span><br><span class="line"></span><br><span class="line"># add_header X-Frame-Options "SAMEORIGIN";</span><br><span class="line"># add_header X-XSS-Protection "1; mode=block";</span><br><span class="line"># add_header X-Content-Type-Options "nosniff";</span><br><span class="line"></span><br><span class="line"> index index.html index.htm index.php;</span><br><span class="line"></span><br><span class="line"> charset utf-8;</span><br><span class="line"> fastcgi_read_timeout 1000;</span><br><span class="line"></span><br><span class="line"> access_log /home/nginx/log/crm_server_dev_access.log main;</span><br><span class="line"></span><br><span class="line"> location / {</span><br><span class="line"> try_files $uri $uri/ /index.php?$query_string;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> location = /favicon.ico { access_log off; log_not_found off; }</span><br><span class="line"> location = /robots.txt { access_log off; log_not_found off; }</span><br><span class="line"></span><br><span class="line"> error_page 404 /index.php;</span><br><span class="line"> location ~ \.php$ {</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> if ($request_method = 'OPTIONS') {</span><br><span class="line"> add_header 'Access-Control-Allow-Origin' '*' always;</span><br><span class="line"> add_header 'Access-Control-Allow-Credentials' 'true';</span><br><span class="line"> add_header 'Access-Control-Allow-Methods' 'GET, POST, PATCH, DELETE, PUT, OPTIONS';</span><br><span class="line"> add_header 'Access-Control-Allow-Headers' 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type, Access-Control-Expose-Headers, Token, Authorization';</span><br><span class="line"> add_header 'Access-Control-Max-Age' 1728000;</span><br><span class="line"> add_header 'Content-Type' 'text/plain charset=UTF-8';</span><br><span class="line"> add_header 'Content-Length' 0;</span><br><span class="line"> return 204;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> add_header 'Access-Control-Allow-Origin' '*' always;</span><br><span class="line"> root /home/crm_server_dev/public;</span><br><span class="line"> fastcgi_pass 127.0.0.1:9000;</span><br><span class="line"> fastcgi_index index.php;</span><br><span class="line"> fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;</span><br><span class="line"> include fastcgi_params;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> location ~ /\.(?!well-known).* {</span><br><span class="line"> deny all;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><code>`</code></p>
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<a href="/2020/05/17/Nginx报10060/" class="post-title-link" itemprop="url">Nginx报 upstream timed out 10060</a>
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<p>~~~</p>
<p>由于系统执行一个时间比较长的接口ngxin抛出下面的错误</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"> upstream timed out (10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while reading response header from upstream</span><br><span class="line">`</span><br></pre></td></tr></table></figure>
<p>解决方法：<br>1，修改fastcgi_read_timeout的参数值，系统默认60秒；<br>2，fastcgi_read_timeout指定nginx接受后端fastcgi响应请求超时时间 （指已完成两次握手后nginx接受fastcgi响应请求超时时间）<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"> location ~ \.php(.*)$ {</span><br><span class="line"> fastcgi_pass 127.0.0.1:9000;</span><br><span class="line"> fastcgi_index index.php;</span><br><span class="line"> fastcgi_split_path_info ^((?U).+\.php)(/?.+)$;</span><br><span class="line"> fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;</span><br><span class="line"> fastcgi_param PATH_INFO $fastcgi_path_info;</span><br><span class="line"> fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;</span><br><span class="line">fastcgi_read_timeout 600;</span><br><span class="line"> include fastcgi_params;</span><br><span class="line"> }</span><br></pre></td></tr></table></figure></p>
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<p>#背景：</p>
<p> 最近需要做个服务端消息推送的事情，首先就考虑到了Laravel自带的广播功能，它是利用redis的发布订阅功能和前端利用node.js实现的一套集合了Websocket 的功能</p>
<p>前置条件：<br>后端：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">1，安装redis扩展</span><br><span class="line"> composer require predis/predis</span><br><span class="line">2，在config/app.php中打开注释：</span><br><span class="line"> App\Providers\BroadcastServiceProvider::class,</span><br><span class="line">3，在.env中</span><br><span class="line"> APP_URL=http://your_domain.com #域名</span><br><span class="line"> APP_NAME=YourAppName #默认laravel即可</span><br><span class="line"> QUEUE_CONNECTION=redis #redis队列</span><br><span class="line"> BROADCAST_DRIVER=redis #broadcast的驱动使用redis</span><br></pre></td></tr></table></figure></p>
<p>前端：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">1,npm Install</span><br><span class="line">2,npm install -g laravel-echo-server #https://github.com/tlaverdure/laravel-echo-server</span><br><span class="line">3,npm install --save socket.io-client</span><br></pre></td></tr></table></figure></p>
<p>#公有频道<br>1,后端代码：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><?php</span><br><span class="line"></span><br><span class="line">namespace App\Events;</span><br><span class="line"></span><br><span class="line">use Illuminate\Broadcasting\Channel;</span><br><span class="line">use Illuminate\Queue\SerializesModels;</span><br><span class="line">use Illuminate\Foundation\Events\Dispatchable;</span><br><span class="line">use Illuminate\Broadcasting\InteractsWithSockets;</span><br><span class="line">use Illuminate\Contracts\Broadcasting\ShouldBroadcast;</span><br><span class="line"></span><br><span class="line">class PublicEvent implements ShouldBroadcast</span><br><span class="line">{</span><br><span class="line"> use Dispatchable, InteractsWithSockets, SerializesModels;</span><br><span class="line"> /**</span><br><span class="line"> * Create a new event instance.</span><br><span class="line"> *</span><br><span class="line"> * @return void</span><br><span class="line"> */</span><br><span class="line"> public $msg = '';</span><br><span class="line"> public function __construct($msg)</span><br><span class="line"> {</span><br><span class="line"> $this->msg = $msg;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> /**</span><br><span class="line"> * Get the channels the event should broadcast on.</span><br><span class="line"> *</span><br><span class="line"> * @return \Illuminate\Broadcasting\Channel|array</span><br><span class="line"> */</span><br><span class="line"> public function broadcastOn()</span><br><span class="line"> {</span><br><span class="line"> return new Channel('public');</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">// public function broadcastWith()</span><br><span class="line">// {</span><br><span class="line">// return [</span><br><span class="line">// 'data' => 'this is public'</span><br><span class="line">// ];</span><br><span class="line">// }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>2,前端代码<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><script></span><br><span class="line">import Echo from 'laravel-echo'</span><br><span class="line"></span><br><span class="line">window.io = require('socket.io-client');</span><br><span class="line">window.Echo = new Echo({</span><br><span class="line"> broadcaster: 'socket.io',</span><br><span class="line"> host: window.location.hostname + ':6001',</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">window.Echo.channel('public')</span><br><span class="line"> .listen('PublicEvent', (e) => {</span><br><span class="line"> console.log(e);</span><br><span class="line"> });</span><br><span class="line"></script></span><br></pre></td></tr></table></figure></p>
<p>3，打开页面在console,即可以看到我们发送的数据<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">{msg: "this is public", socket: null}</span><br><span class="line">msg: "this is public"</span><br><span class="line">socket: null</span><br><span class="line">__proto__: Object</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>#私有频道<br>PrivateEvent：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre></td><td class="code"><pre><span class="line"><?php</span><br><span class="line"></span><br><span class="line">namespace App\Events;</span><br><span class="line"></span><br><span class="line">use App\Models\UserModel;</span><br><span class="line">use Illuminate\Queue\SerializesModels;</span><br><span class="line">use Illuminate\Broadcasting\PrivateChannel;</span><br><span class="line">use Illuminate\Foundation\Events\Dispatchable;</span><br><span class="line">use Illuminate\Broadcasting\InteractsWithSockets;</span><br><span class="line">use Illuminate\Contracts\Broadcasting\ShouldBroadcast;</span><br><span class="line"></span><br><span class="line">class PrivateEvent implements ShouldBroadcast</span><br><span class="line">{</span><br><span class="line"> use Dispatchable, InteractsWithSockets, SerializesModels;</span><br><span class="line"></span><br><span class="line"> public $user;</span><br><span class="line"> public $userId = '';</span><br><span class="line"></span><br><span class="line"> /**</span><br><span class="line"> * Create a new event instance.</span><br><span class="line"> *</span><br><span class="line"> * @return void</span><br><span class="line"> */</span><br><span class="line"> public function __construct(UserModel $user)</span><br><span class="line"> {</span><br><span class="line"></span><br><span class="line"> $this->user = $user;</span><br><span class="line"> $this->userId = 3590;</span><br><span class="line"></span><br><span class="line"> // dd('user.' . $this->user->u_id);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> /**</span><br><span class="line"> * Get the channels the event should broadcast on.</span><br><span class="line"> *</span><br><span class="line"> * @return \Illuminate\Broadcasting\Channel|array</span><br><span class="line"> */</span><br><span class="line"> public function broadcastOn()</span><br><span class="line"> {</span><br><span class="line"> // dd(Auth::user());</span><br><span class="line"> return new PrivateChannel('user.' . $this->userId);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line">// 精细化返回的数据，如果加了这个函数，公有属性才不会返回而是以这个函数内放回的字段为主</span><br><span class="line">// public function broadcastWith()</span><br><span class="line">// {</span><br><span class="line">// return [</span><br><span class="line">// 'data' => '2424',</span><br><span class="line">// ];</span><br><span class="line">// }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>BroadcastServiceProvider:<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><?php</span><br><span class="line"></span><br><span class="line">namespace App\Providers;</span><br><span class="line"></span><br><span class="line">use Illuminate\Support\ServiceProvider;</span><br><span class="line">use Illuminate\Support\Facades\Broadcast;</span><br><span class="line"></span><br><span class="line">class BroadcastServiceProvider extends ServiceProvider</span><br><span class="line">{</span><br><span class="line"> /**</span><br><span class="line"> * Bootstrap any application services.</span><br><span class="line"> *</span><br><span class="line"> * @return void</span><br><span class="line"> */</span><br><span class="line"> public function boot()</span><br><span class="line"> {</span><br><span class="line"> //Broadcast::routes();</span><br><span class="line"> Broadcast::routes(['middleware' => 'api']);</span><br><span class="line"> #routes()参数如果不配置 默认走的是web中间件</span><br><span class="line"> #'middleware' => 'api' 然后广播路由走api中间件，自己也可以定义其他类型的中间件</span><br><span class="line"></span><br><span class="line"> require base_path('routes/channels.php'); #加载检查权限的广播路由</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>routes/channels：#广播路由只针对广播的<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><?php</span><br><span class="line"></span><br><span class="line">/*</span><br><span class="line">|--------------------------------------------------------------------------</span><br><span class="line">| Broadcast Channels</span><br><span class="line">|--------------------------------------------------------------------------</span><br><span class="line">|</span><br><span class="line">| Here you may register all of the event broadcasting channels that your</span><br><span class="line">| application supports. The given channel authorization callbacks are</span><br><span class="line">| used to check if an authenticated user can listen to the channel.</span><br><span class="line">|</span><br><span class="line">*/</span><br><span class="line"></span><br><span class="line">//占位符模式</span><br><span class="line">\Illuminate\Support\Facades\Broadcast::channel('user.{userId}', function ($user, $userId) {</span><br><span class="line"> return true;</span><br><span class="line">}, ['guards' => ['api']]);</span><br><span class="line"></span><br><span class="line">#{userId}只是占位符</span><br><span class="line">#$user 闭包默认的第一个参数，授权的用户</span><br><span class="line">#$userId 时间模板的公有属性(此时该值为3590即在PrivateEvent构造函数上所赋的值)，也可以是其他的对象</span><br><span class="line">#闭包函数接受多个参数，这个参数由事件里的broadcastOn函数声明的频道决定,如：'user.' . $this->userId . $this->userName 那么就可以接受2个参数userId和userName</span><br><span class="line"></span><br><span class="line">//显式的路由模型绑定</span><br><span class="line">\Illuminate\Support\Facades\Broadcast::channel('user.{user2}', function ($user, \App\Models\UserModel $user2) {</span><br><span class="line"> \Illuminate\Support\Facades\Log::info($user);</span><br><span class="line"> return true;</span><br><span class="line">}, ['guards' => ['api']]);</span><br><span class="line"># 注意这里的占位符{user2} 必须 \App\Models\UserModel $user2 这个变量名一样。否则会报错</span><br></pre></td></tr></table></figure></p>
<p>前端代码<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><script></span><br><span class="line">import Echo from 'laravel-echo'</span><br><span class="line"></span><br><span class="line">window.io = require('socket.io-client');</span><br><span class="line">window.Echo = new Echo({</span><br><span class="line"> broadcaster: 'socket.io',</span><br><span class="line"> host: window.location.hostname + ':6001',</span><br><span class="line"> auth: {</span><br><span class="line"> headers: {</span><br><span class="line"> Authorization: 'Bearer ' + 'WVP25lQfJFTpCcuA1rmdadgeXQplMOtobWjL4TvkDD8dMbjOX5pBF4kBwiC9'</span><br><span class="line"> },</span><br><span class="line"> },</span><br><span class="line">});</span><br><span class="line"></span><br><span class="line">window.Echo.private('user.3590')</span><br><span class="line"> .listen('PrivateEvent', (e) => { </span><br><span class="line"> alert(11);</span><br><span class="line"> console.log(1111);</span><br><span class="line"> console.log(e);</span><br><span class="line"> });</span><br><span class="line"></script></span><br><span class="line"></span><br><span class="line">#user.3590 监听的频道</span><br><span class="line">#PrivateEvent 监听的事件</span><br><span class="line">#Authorization 授权，后端会检测如果不对会报错403</span><br></pre></td></tr></table></figure></p>
<p>页面展示：不出意外会把公有属性全部展示出来，其他的属性不会展示<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">{</span><br><span class="line">user: {…}, userId: 3590, socket: null}</span><br><span class="line">socket: null</span><br><span class="line">user: {u_id: 3590, u_username: "02125", u_job_number: "", u_warehouse_id: 1, u_department_id: 0, …}</span><br><span class="line">userId: 3590</span><br><span class="line">__proto__: Object</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>参考：<br><a href="https://xueyuanjun.com/post/19505" target="_blank" rel="noopener">https://xueyuanjun.com/post/19505</a><br><a href="http://silverd.cn/2018/06/01/laravel-broadcasting-adv.html" target="_blank" rel="noopener">http://silverd.cn/2018/06/01/laravel-broadcasting-adv.html</a></p>
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<a href="/2020/04/27/MySQL获取分组后的TOP1和TOPN记录/" class="post-title-link" itemprop="url">Mysql获取Top N和Top 1的问题</a>
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<p>有时会碰到一些需求，查询分组后的最大值，最小值所在的整行记录或者分组后的top n行的记录，在一些别的数据库可能有窗口函数可以方面的查出来，但是MySQL没有这些函数,没有直接的方法可以查出来，可通过以下的方法来查询。</p>
<h2 id="建表"><a href="#建表" class="headerlink" title="建表"></a>建表</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">CREATE TABLE `test1` (</span><br><span class="line"> `id` int(11) NOT NULL AUTO_INCREMENT,</span><br><span class="line"> `name` varchar(20) DEFAULT NULL,</span><br><span class="line"> `course` varchar(20) DEFAULT NULL,</span><br><span class="line"> `score` int(11) DEFAULT NULL,</span><br><span class="line"> PRIMARY KEY (`id`)</span><br><span class="line">) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8</span><br></pre></td></tr></table></figure>
<p>##插入数据<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">insert into test1(name,course,score)</span><br><span class="line">values</span><br><span class="line">('张三','语文',80),</span><br><span class="line">('李四','语文',90),</span><br><span class="line">('王五','语文',93),</span><br><span class="line">('张三','数学',77),</span><br><span class="line">('李四','数学',68),</span><br><span class="line">('王五','数学',99),</span><br><span class="line">('张三','英语',90),</span><br><span class="line">('李四','英语',50),</span><br><span class="line">('王五','英语',89);</span><br></pre></td></tr></table></figure></p>
<p>##查看结果：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">root:test> select * from test1;</span><br><span class="line">+----+--------+--------+-------+</span><br><span class="line">| id | name | course | score |</span><br><span class="line">+----+--------+--------+-------+</span><br><span class="line">| 1 | 张三 | 语文 | 80 |</span><br><span class="line">| 2 | 李四 | 语文 | 90 |</span><br><span class="line">| 3 | 王五 | 语文 | 93 |</span><br><span class="line">| 4 | 张三 | 数学 | 77 |</span><br><span class="line">| 5 | 李四 | 数学 | 68 |</span><br><span class="line">| 6 | 王五 | 数学 | 99 |</span><br><span class="line">| 7 | 张三 | 英语 | 90 |</span><br><span class="line">| 8 | 李四 | 英语 | 50 |</span><br><span class="line">| 9 | 王五 | 英语 | 89 |</span><br><span class="line">+----+--------+--------+-------+</span><br></pre></td></tr></table></figure></p>
<p>##TOP 1<br>查询每门课程分数最高的学生以及成绩</p>
<p>1、使用自连接【推荐】<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">root:test> select a.name,a.course,a.score from</span><br><span class="line"> -> test1 a</span><br><span class="line"> -> join (select course,max(score) score from test1 group by course) b </span><br><span class="line"> -> on a.course=b.course and a.score=b.score;</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| name | course | score |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| 王五 | 语文 | 93 |</span><br><span class="line">| 王五 | 数学 | 99 |</span><br><span class="line">| 张三 | 英语 | 90 |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">rows in set (0.00 sec)</span><br></pre></td></tr></table></figure></p>
<p>2，使用相关子查询<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">root:test> select name,course,score from test1 a</span><br><span class="line"> -> where score=(select max(score) from test1 where a.course=test1.course);</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| name | course | score |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| 王五 | 语文 | 93 |</span><br><span class="line">| 王五 | 数学 | 99 |</span><br><span class="line">| 张三 | 英语 | 90 |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">rows in set (0.00 sec)</span><br></pre></td></tr></table></figure></p>
<p>或者<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">root:test> select name,course,score from test1 a</span><br><span class="line"> -> where not exists(select 1 from test1 where a.course=test1.course and a.score < test1.score);</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| name | course | score |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| 王五 | 语文 | 93 |</span><br><span class="line">| 王五 | 数学 | 99 |</span><br><span class="line">| 张三 | 英语 | 90 |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">3 rows in set (0.00 sec)</span><br></pre></td></tr></table></figure></p>
<p>##TOP N<br>N>=1</p>
<p>查询每门课程前两名的学生以及成绩<br>1、使用union all</p>
<p>如果结果集比较小，可以用程序查询单个分组结果后拼凑，也可以使用union all<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">root:test> (select name,course,score from test1 where course='语文' order by score desc limit 2)</span><br><span class="line"> -> union all</span><br><span class="line"> -> (select name,course,score from test1 where course='数学' order by score desc limit 2)</span><br><span class="line"> -> union all</span><br><span class="line"> -> (select name,course,score from test1 where course='英语' order by score desc limit 2);</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| name | course | score |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| 王五 | 语文 | 93 |</span><br><span class="line">| 李四 | 语文 | 90 |</span><br><span class="line">| 王五 | 数学 | 99 |</span><br><span class="line">| 张三 | 数学 | 77 |</span><br><span class="line">| 张三 | 英语 | 90 |</span><br><span class="line">| 王五 | 英语 | 89 |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">rows in set (0.01 sec)</span><br></pre></td></tr></table></figure></p>
<p>2、自身左连接<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">root:test> select a.name,a.course,a.score</span><br><span class="line"> -> from test1 a left join test1 b on a.course=b.course and a.score<b.score</span><br><span class="line"> -> group by a.name,a.course,a.score</span><br><span class="line"> -> having count(b.id)<2</span><br><span class="line"> -> order by a.course,a.score desc;</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| name | course | score |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| 王五 | 数学 | 99 |</span><br><span class="line">| 张三 | 数学 | 77 |</span><br><span class="line">| 张三 | 英语 | 90 |</span><br><span class="line">| 王五 | 英语 | 89 |</span><br><span class="line">| 王五 | 语文 | 93 |</span><br><span class="line">| 李四 | 语文 | 90 |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">rows in set (0.00 sec)</span><br></pre></td></tr></table></figure></p>
<p>3、相关子查询<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">root:test> select *</span><br><span class="line"> -> from test1 a</span><br><span class="line"> -> where (select count(*) from test1 where course=a.course and score>a.score) < 2</span><br><span class="line"> -> order by a.course,a.score desc;</span><br><span class="line">+----+--------+--------+-------+</span><br><span class="line">| id | name | course | score |</span><br><span class="line">+----+--------+--------+-------+</span><br><span class="line">| 6 | 王五 | 数学 | 99 |</span><br><span class="line">| 4 | 张三 | 数学 | 77 |</span><br><span class="line">| 7 | 张三 | 英语 | 90 |</span><br><span class="line">| 9 | 王五 | 英语 | 89 |</span><br><span class="line">| 3 | 王五 | 语文 | 93 |</span><br><span class="line">| 2 | 李四 | 语文 | 90 |</span><br><span class="line">+----+--------+--------+-------+</span><br><span class="line">6 rows in set (0.01 sec)</span><br></pre></td></tr></table></figure></p>
<p>4、使用用户变量<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">root:test> set @num := 0, @course := '';</span><br><span class="line">Query OK, 0 rows affected (0.00 sec)</span><br><span class="line"></span><br><span class="line">root:test> </span><br><span class="line">root:test> select name, course, score</span><br><span class="line"> -> from (</span><br><span class="line"> -> select name, course, score,</span><br><span class="line"> -> @num := if(@course = course, @num + 1, 1) as row_number,</span><br><span class="line"> -> @course := course as dummy</span><br><span class="line"> -> from test1</span><br><span class="line"> -> order by course, score desc</span><br><span class="line"> -> ) as x where x.row_number <= 2;</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| name | course | score |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">| 王五 | 数学 | 99 |</span><br><span class="line">| 张三 | 数学 | 77 |</span><br><span class="line">| 张三 | 英语 | 90 |</span><br><span class="line">| 王五 | 英语 | 89 |</span><br><span class="line">| 王五 | 语文 | 93 |</span><br><span class="line">| 李四 | 语文 | 90 |</span><br><span class="line">+--------+--------+-------+</span><br><span class="line">6 rows in set (0.00 sec)</span><br></pre></td></tr></table></figure></p>
<p>转载：<br><a href="https://www.cnblogs.com/prayer21/p/6029694.html" target="_blank" rel="noopener">https://www.cnblogs.com/prayer21/p/6029694.html</a></p>
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<p>实现对学生按课程依成绩高低进行排序</p>
<p>建表：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">CREATE TABLE `test` (</span><br><span class="line"> `id` int(11) NOT NULL AUTO_INCREMENT,</span><br><span class="line"> `name` varchar(20) DEFAULT NULL,</span><br><span class="line"> `course` varchar(20) DEFAULT NULL,</span><br><span class="line"> `score` int(11) DEFAULT NULL,</span><br><span class="line"> PRIMARY KEY (`id`)</span><br><span class="line">) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;</span><br></pre></td></tr></table></figure></p>
<p>数据：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">1 张三 语文 80</span><br><span class="line">2 李四 语文 90</span><br><span class="line">3 王五 语文 93</span><br><span class="line">4 张三 数学 77</span><br><span class="line">5 李四 数学 68</span><br><span class="line">6 王五 数学 99</span><br><span class="line">7 张三 英语 90</span><br><span class="line">8 李四 英语 50</span><br><span class="line">9 王五 英语 89</span><br></pre></td></tr></table></figure></p>
<p>##子查询<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">SELECT</span><br><span class="line"> *, (</span><br><span class="line"> SELECT</span><br><span class="line"> COUNT(b.score) + 1</span><br><span class="line"> FROM</span><br><span class="line"> test b</span><br><span class="line"> WHERE</span><br><span class="line"> a. NAME = b. NAME</span><br><span class="line"> AND a.score < b.score</span><br><span class="line"> ) AS 'rank'</span><br><span class="line">FROM</span><br><span class="line"> test a</span><br><span class="line">ORDER BY</span><br><span class="line"> NAME,</span><br><span class="line"> rank</span><br><span class="line"></span><br><span class="line">查询结果：</span><br><span class="line">7 张三 英语 90 1</span><br><span class="line">1 张三 语文 80 2</span><br><span class="line">4 张三 数学 77 3</span><br><span class="line">2 李四 语文 90 1</span><br><span class="line">5 李四 数学 68 2</span><br><span class="line">8 李四 英语 50 3</span><br><span class="line">6 王五 数学 99 1</span><br><span class="line">3 王五 语文 93 2</span><br><span class="line">9 王五 英语 89 3</span><br></pre></td></tr></table></figure></p>
<p>#自连接<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">SELECT </span><br><span class="line"> a.*, COUNT(b.score)+1 AS 'rank'</span><br><span class="line">FROM </span><br><span class="line"> test a LEFT JOIN test b ON (a.name = b.name AND a.score < b.score)</span><br><span class="line">GROUP BY </span><br><span class="line"> a.name, a.score,a.course</span><br><span class="line">ORDER BY </span><br><span class="line"> a.name, COUNT(b.score) asc</span><br><span class="line"></span><br><span class="line">查询结果：</span><br><span class="line">7 张三 英语 90 1</span><br><span class="line">1 张三 语文 80 2</span><br><span class="line">4 张三 数学 77 3</span><br><span class="line">2 李四 语文 90 1</span><br><span class="line">5 李四 数学 68 2</span><br><span class="line">8 李四 英语 50 3</span><br><span class="line">6 王五 数学 99 1</span><br><span class="line">3 王五 语文 93 2</span><br><span class="line">9 王五 英语 89 3</span><br></pre></td></tr></table></figure></p>
<p>参考：<br><a href="https://mp.weixin.qq.com/s/s8EiV-oKNR4n9Goe4gIAOw" target="_blank" rel="noopener">https://mp.weixin.qq.com/s/s8EiV-oKNR4n9Goe4gIAOw</a></p>
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<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">1,批量删除：</span><br><span class="line">redis-cli -n 0 -a pw keys "*-no-exist-uid" | xargs redis-cli -a pw del</span><br><span class="line">pw:redis的连接密码</span><br><span class="line">"*-no-exist-uid"：匹配的值，后缀是-no-exist-uid的key都会给删除</span><br><span class="line">-n:指定的数据库 默认是0库</span><br><span class="line"></span><br><span class="line">2,单个删除</span><br><span class="line">del key</span><br><span class="line">3,删除当前数据库中的所有Key </span><br><span class="line">flushdb </span><br><span class="line">4,删除所有数据库中的key </span><br><span class="line">flushall</span><br></pre></td></tr></table></figure>
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<a href="/2019/12/06/centos7安装mysql8的坑/" class="post-title-link" itemprop="url">centos7安装mysql8的坑</a>
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<time title="创建时间：2019-12-06 16:07:49 / 修改时间：16:34:09" itemprop="dateCreated datePublished" datetime="2019-12-06T16:07:49+08:00">2019-12-06</time>
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<span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/Mysql/" itemprop="url" rel="index"><span itemprop="name">Mysql</span></a></span>
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<p>安装过程：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line">cd /usr/src</span><br><span class="line">wget https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm</span><br><span class="line"> </span><br><span class="line">#安装yum源</span><br><span class="line">yum localinstall mysql80-community-release-el7-1.noarch.rpm</span><br><span class="line"> </span><br><span class="line">#更新yum源</span><br><span class="line">yum clean all</span><br><span class="line">yum makecache</span><br><span class="line"> </span><br><span class="line">#开始安装MySQL</span><br><span class="line">yum install mysql-community-server</span><br><span class="line"> </span><br><span class="line">#启动MySQL</span><br><span class="line">systemctl start mysqld</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">至此安装完成</span><br><span class="line"></span><br><span class="line">第四步获取密码：</span><br><span class="line"></span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz src]# cat /var/log/mysqld.log | grep password</span><br><span class="line">2019-12-04T01:59:00.167999Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: l4neY,lKxG5D</span><br><span class="line"></span><br><span class="line">#登录MySQL修改mysql用户密码，密码不能太简单</span><br><span class="line">mysql -u root -p</span><br><span class="line">mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'l4neY,lKxG6D';</span><br></pre></td></tr></table></figure>
<p>异常：<br>Job for mysqld.service failed because the control process exited with error code. See “systemctl status mysqld.service” and “journalctl -xe” for details.</p>
<p>打开日志：cat /var/log/mysqld.log<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">2019-12-03T14:55:59.513203Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.18) starting as process 1088</span><br><span class="line">2019-12-03T14:55:59.626483Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.</span><br><span class="line">2019-12-03T14:55:59.626637Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.</span><br><span class="line">2019-12-03T14:55:59.626707Z 0 [ERROR] [MY-010119] [Server] Aborting</span><br></pre></td></tr></table></figure></p>
<p>日志分析：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line">大概意思是找不到有效数据，查看</span><br><span class="line">/usr/sbin/mysqld,发现是组和拥有者都是root,而我们的mysql执行是以mysql用户执行的。这个时候修改相关文件的组和拥有者。</span><br><span class="line"></span><br><span class="line">一:</span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz dava]# ls -ld /usr/sbin/mysqld</span><br><span class="line">-rwxr-xr-x 1 root root 850078160 Sep 20 17:32 /usr/sbin/mysqld</span><br><span class="line"></span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz dava]# chown -R mysql:mysql /usr/sbin/mysqld</span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz dava]# ls -ld /usr/sbin/mysqld</span><br><span class="line">-rwxr-xr-x 1 mysql mysql 850078160 Sep 20 17:32 /usr/sbin/mysqld</span><br><span class="line"></span><br><span class="line">二，</span><br><span class="line"></span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz dava]# ls -al /var/lib/mysql</span><br><span class="line">total 188492</span><br><span class="line">drwxr-x--x 6 mysql mysql 4096 Dec 3 23:13 .</span><br><span class="line">drwxr-xr-x. 42 root root 4096 Dec 3 22:31 ..</span><br><span class="line">-rw-r----- 1 root root 56 Mar 2 2019 auto.cnf</span><br><span class="line">-rw-r----- 1 mysql mysql 0 Dec 3 22:55 binlog.index</span><br><span class="line">-rw------- 1 root root 1675 Mar 2 2019 ca-key.pem</span><br><span class="line">-rw-r--r-- 1 root root 1107 Mar 2 2019 ca.pem</span><br><span class="line">-rw-r--r-- 1 root root 1107 Mar 2 2019 client-cert.pem</span><br><span class="line">-rw------- 1 root root 1675 Mar 2 2019 client-key.pem</span><br><span class="line">-rw-r----- 1 root root 277 Mar 27 2019 ib_buffer_pool</span><br><span class="line">-rw-r----- 1 root root 79691776 Apr 4 2019 ibdata1</span><br><span class="line">-rw-r----- 1 root root 50331648 Apr 4 2019 ib_logfile0</span><br><span class="line">-rw-r----- 1 root root 50331648 Mar 2 2019 ib_logfile1</span><br><span class="line">-rw-r----- 1 root root 12582912 Apr 4 2019 ibtmp1</span><br><span class="line">drwxr-x--- 2 root root 4096 Mar 2 2019 mysql</span><br><span class="line">srwxrwxrwx 1 root root 0 Apr 1 2019 mysql.sock</span><br><span class="line">-rw------- 1 root root 6 Apr 1 2019 mysql.sock.lock</span><br><span class="line">drwxr-x--- 2 root root 4096 Mar 2 2019 performance_schema</span><br><span class="line">-rw------- 1 root root 1679 Mar 2 2019 private_key.pem</span><br><span class="line">-rw-r--r-- 1 root root 451 Mar 2 2019 public_key.pem</span><br><span class="line">-rw-r--r-- 1 root root 1107 Mar 2 2019 server-cert.pem</span><br><span class="line">-rw------- 1 root root 1679 Mar 2 2019 server-key.pem</span><br><span class="line">drwxr-x--- 2 root root 12288 Mar 2 2019 sys</span><br><span class="line">drwxr-x--- 2 root root 4096 Mar 27 2019 wp</span><br><span class="line"></span><br><span class="line">chown mysql:mysql /var/lib/mysql -R</span><br><span class="line"></span><br><span class="line">三:使用服务器初始化数据目录，包括mysql包含初始MySQL授权表的数据库，这些数据库确定如何允许用户连接到服务器</span><br><span class="line">mysqld --initailize --user=mysql</span><br><span class="line"></span><br><span class="line">四，</span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz dava]# systemctl start mysqld</span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz dava]# systemctl status mysqld</span><br><span class="line">● mysqld.service - MySQL Server</span><br><span class="line"> Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)</span><br><span class="line"> Active: active (running) since Tue 2019-12-03 23:15:35 CST; 22s ago</span><br><span class="line"> Docs: man:mysqld(8)</span><br><span class="line"> http://dev.mysql.com/doc/refman/en/using-systemd.html</span><br><span class="line"> Process: 1529 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)</span><br><span class="line"> Main PID: 1556 (mysqld)</span><br><span class="line"> Status: "Server is operational"</span><br><span class="line"> CGroup: /system.slice/mysqld.service</span><br><span class="line"> └─1556 /usr/sbin/mysqld</span><br><span class="line">^C</span><br><span class="line">[root@izj6c3njvldcpf6rgj4srvz dava]#</span><br></pre></td></tr></table></figure></p>
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