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local-search.xml
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<?xml version="1.0" encoding="utf-8"?>
<search>
<entry>
<title>CentOS7离线安装Python3环境</title>
<link href="/2024/08/09/CentOS7%E7%A6%BB%E7%BA%BF%E5%AE%89%E8%A3%85Python3%E7%8E%AF%E5%A2%83/"/>
<url>/2024/08/09/CentOS7%E7%A6%BB%E7%BA%BF%E5%AE%89%E8%A3%85Python3%E7%8E%AF%E5%A2%83/</url>
<content type="html"><![CDATA[<h2 id="1-安装环境准备"><a href="#1-安装环境准备" class="headerlink" title="1.安装环境准备"></a>1.安装环境准备</h2><p>python3环境依赖包：py3_lib.tar.gz</p><p>python3安装包：Python-3.9.9.tar.xz</p><p>百度网盘链接：<a href="https://pan.baidu.com/s/1ZVPsCw5UtHbWr2VpmidgVw?pwd=w5hi">https://pan.baidu.com/s/1ZVPsCw5UtHbWr2VpmidgVw?pwd=w5hi</a> </p><h2 id="2-上传python3环境依赖包和安装包，并解压"><a href="#2-上传python3环境依赖包和安装包，并解压" class="headerlink" title="2.上传python3环境依赖包和安装包，并解压"></a>2.上传python3环境依赖包和安装包，并解压</h2><figure class="highlight shell"><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></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">先创建文件夹</span><br>mkdir /usr/local/python3<br> <br>cd /usr/local/python3<br><span class="hljs-meta prompt_"># </span><span class="language-bash">上传python环境依赖包到此目录下,解压</span><br>tar -zxvf py3_lib.tar.gz<br><span class="hljs-meta prompt_">#</span><span class="language-bash">进入解压目录</span><br>cd py3<br><span class="hljs-meta prompt_">#</span><span class="language-bash">强制安装全部依赖</span><br>rpm -ivh *.rpm --force --nodeps<br> <br>cd /usr/local/python3<br><span class="hljs-meta prompt_"># </span><span class="language-bash">上传python3安装包到此目录下,解压</span><br>tar -xvJf Python-3.9.9.tar.xz<br><span class="hljs-meta prompt_">#</span><span class="language-bash">进入解压目录</span><br>cd Python-3.9.9<br><span class="hljs-meta prompt_">#</span><span class="language-bash">开始安装python3</span><br>./configure --prefix=/usr/local/python3<br><span class="hljs-meta prompt_">#</span><span class="language-bash">执行此命令需要gcc可先查看当前Linux是否安装gcc: gcc -v</span><br>make && make install<br></code></pre></td></tr></table></figure><p>执行成功会出现 <strong>Successfully</strong></p><img src="/2024/08/09/CentOS7%E7%A6%BB%E7%BA%BF%E5%AE%89%E8%A3%85Python3%E7%8E%AF%E5%A2%83/s2.jpg" class=""><h2 id="3-配置软连接，并检查是否安装成功"><a href="#3-配置软连接，并检查是否安装成功" class="headerlink" title="3.配置软连接，并检查是否安装成功"></a>3.配置软连接，并检查是否安装成功</h2><figure class="highlight shell"><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></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_">#</span><span class="language-bash">创建软连接</span><br>ln -s /usr/local/python3/bin/python3 /usr/bin/python3<br>ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3<br><span class="hljs-meta prompt_">#</span><span class="language-bash">验证版本</span><br>python3<br><span class="hljs-meta prompt_"># </span><span class="language-bash">查看版本</span><br>python3 -V<br>pip3 -V<br></code></pre></td></tr></table></figure><h2 id="4-其他情况"><a href="#4-其他情况" class="headerlink" title="4.其他情况"></a>4.其他情况</h2><p>执行 ：<code>./configure --prefix=/usr/local/python3 </code> 结束的数据会提示：</p><img src="/2024/08/09/CentOS7%E7%A6%BB%E7%BA%BF%E5%AE%89%E8%A3%85Python3%E7%8E%AF%E5%A2%83/s1.jpg" class=""><p>出现次状况不要去执行他给的命令，忽略就好，要不然最后的 <code>make && make install</code> 会执行失败</p>]]></content>
<categories>
<category>Python3</category>
</categories>
<tags>
<tag>Linux</tag>
</tags>
</entry>
<entry>
<title>CentOS安装RabbitMQ</title>
<link href="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/"/>
<url>/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/</url>
<content type="html"><![CDATA[<h3 id="1、下载安装启动RabbitMQ"><a href="#1、下载安装启动RabbitMQ" class="headerlink" title="1、下载安装启动RabbitMQ"></a>1、下载安装启动RabbitMQ</h3><h4 id="1-1、下载RabbitMQ"><a href="#1-1、下载RabbitMQ" class="headerlink" title="1.1、下载RabbitMQ"></a>1.1、下载RabbitMQ</h4><p><strong>下载地址</strong>：<a href="https://github.com/rabbitmq/rabbitmq-server/releases?q=3.8.14&expanded=true">https://github.com/rabbitmq/rabbitmq-server/releases?q=3.8.14&expanded=true</a></p><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s1.jpg" class=""><h4 id="1-2、下载Erlang"><a href="#1-2、下载Erlang" class="headerlink" title="1.2、下载Erlang"></a>1.2、下载Erlang</h4><p><strong>下载地址</strong>：<a href="https://packagecloud.io/rabbitmq/erlang/packages/el/7/erlang-23.2.7-2.el7.x86_64.rpm">https://packagecloud.io/rabbitmq/erlang/packages/el/7/erlang-23.2.7-2.el7.x86_64.rpm</a></p><p>点击右上角的 <strong>Download</strong></p><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s2.jpg" class=""><h4 id="1-3、安装Erlang"><a href="#1-3、安装Erlang" class="headerlink" title="1.3、安装Erlang"></a>1.3、安装Erlang</h4><p>首先将下载好的文件上传到服务器，创建一个文件夹用来存放文件</p><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s3.jpg" class=""><p>开始解压安装 <strong>erlang</strong></p><figure class="highlight shell"><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><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">解压</span><br>rpm -Uvh erlang-23.2.7-2.el7.x86_64.rpm<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">安装</span><br>yum install -y erlang<br></code></pre></td></tr></table></figure><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s4.jpg" class=""><p>安装完成后查看版本号</p><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s5.jpg" class=""><h4 id="1-4、安装Socat"><a href="#1-4、安装Socat" class="headerlink" title="1.4、安装Socat"></a>1.4、安装Socat</h4><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs shell">rpm -ivh socat-1.7.3.2-2.el7.x86_64.rpm<br></code></pre></td></tr></table></figure><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s6.jpg" class=""><h4 id="1-5、安装RabbitMQ"><a href="#1-5、安装RabbitMQ" class="headerlink" title="1.5、安装RabbitMQ"></a>1.5、安装RabbitMQ</h4><figure class="highlight shell"><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><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">解压</span><br>rpm -Uvh rabbitmq-server-3.8.14-1.el7.noarch.rpm<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">安装</span><br>yum install -y rabbitmq-server<br></code></pre></td></tr></table></figure><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s7.jpg" class=""><h4 id="1-6、启动RabbitMQ服务"><a href="#1-6、启动RabbitMQ服务" class="headerlink" title="1.6、启动RabbitMQ服务"></a>1.6、启动RabbitMQ服务</h4><figure class="highlight shell"><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><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">启动rabbitmq</span><br>systemctl start rabbitmq-server<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">查看rabbitmq状态</span><br>systemctl status rabbitmq-server<br></code></pre></td></tr></table></figure><p>显示<code>active</code>则表示服务安装并启动成功</p><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s8.jpg" class=""><p><strong>其他命令：</strong></p><figure class="highlight shell"><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><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">设置rabbitmq服务开机自启动</span><br>systemctl enable rabbitmq-server<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">关闭rabbitmq服务</span><br>systemctl stop rabbitmq-server<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">重启rabbitmq服务</span><br>systemctl restart rabbitmq-server<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">禁止开启启动</span><br>systemctl disable rabbitmq-server.service<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">查看rabbitmq开机启动状态 enabled:开启, disabled:关闭</span><br>systemctl is-enabled rabbitmq-server.service<br></code></pre></td></tr></table></figure><h3 id="2、RabbitMQWeb管理界面及授权操作"><a href="#2、RabbitMQWeb管理界面及授权操作" class="headerlink" title="2、RabbitMQWeb管理界面及授权操作"></a>2、RabbitMQWeb管理界面及授权操作</h3><p>默认情况下，rabbitmq没有安装web端的客户端软件，需要安装才可以生效</p><figure class="highlight shell"><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><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">查看插件列表</span><br>rabbitmq-plugins list<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">打开RabbitMQWeb管理界面插件</span><br>rabbitmq-plugins enable rabbitmq_management<br></code></pre></td></tr></table></figure><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s9.jpg" class=""><p>然后我们打开浏览器，访问<code>服务器ip:15672</code>，就可以看到管理界面</p><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s10.jpg" class=""><p><code>rabbitmq</code>有一个默认的账号密码<code>guest</code>，但该情况仅限于本机localhost进行访问，所以需要添加一个远程登录的用户</p><h4 id="2-1、添加远程用户"><a href="#2-1、添加远程用户" class="headerlink" title="2.1、添加远程用户"></a>2.1、添加远程用户</h4><figure class="highlight shell"><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></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">添加用户</span><br>rabbitmqctl add_user 用户名 密码<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">设置用户角色,分配操作权限</span><br>rabbitmqctl set_user_tags 用户名 角色<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">为用户添加资源权限(授予访问虚拟机根节点的所有权限)</span><br>rabbitmqctl set_permissions -p / 用户名 ".*" ".*" ".*"<br></code></pre></td></tr></table></figure><p><strong>角色有四种</strong>：</p><ul><li><code>administrator</code>：可以登录控制台、查看所有信息、并对rabbitmq进行管理</li><li><code>monToring</code>：监控者；登录控制台，查看所有信息</li><li><code>policymaker</code>：策略制定者；登录控制台指定策略</li><li><code>managment</code>：普通管理员；登录控制</li></ul><p>这里创建用户<code>root，密码</code>200381<code>，设置</code>adminstator`角色，赋予所有权限</p><img src="/2024/07/11/CentOS%E5%AE%89%E8%A3%85RabbitMQ/s11.jpg" class=""><p>其他指令：</p><figure class="highlight shell"><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></pre></td><td class="code"><pre><code class="hljs shell"><span class="hljs-meta prompt_"># </span><span class="language-bash">修改密码</span><br>rabbitmqctl change_ password 用户名 新密码<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">删除用户</span><br>rabbitmqctl delete_user 用户名<br><span class="hljs-meta prompt_"></span><br><span class="hljs-meta prompt_"># </span><span class="language-bash">查看用户清单</span><br>rabbitmqctl list_users<br></code></pre></td></tr></table></figure>]]></content>
<tags>
<tag>RabbitMQ</tag>
</tags>
</entry>
<entry>
<title>Neo4j基础命令</title>
<link href="/2024/02/26/Neo4j%E5%9F%BA%E7%A1%80%E5%91%BD%E4%BB%A4/"/>
<url>/2024/02/26/Neo4j%E5%9F%BA%E7%A1%80%E5%91%BD%E4%BB%A4/</url>
<content type="html"><![CDATA[<h3 id="1-创建一个简单的三国关系数据库"><a href="#1-创建一个简单的三国关系数据库" class="headerlink" title="1.创建一个简单的三国关系数据库"></a>1.创建一个简单的三国关系数据库</h3><p> <strong>使用下面的Cypher语句：</strong></p><figure class="highlight plaintext"><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><code class="hljs cypher">CREATE (n1:`人物` {name: '刘备'}) -[:`关系`{relationship:'兄长'}]-> (n2:`人物` {name: '关羽'}),<br>(n2) -[:`关系`{relationship:'兄长'}]-> (n3:`人物` {name: '张飞'}),<br>(n1) -[:`关系`{relationship:'兄长'}]-> (n3),<br>(n1) -[:`关系`{relationship:'主公'}]-> (n4:`人物` {name: '赵云'}),<br>(n1) -[:`关系`{relationship:'对手'}]-> (n5:`人物` {name: '曹操'});<br></code></pre></td></tr></table></figure><img src="/2024/02/26/Neo4j%E5%9F%BA%E7%A1%80%E5%91%BD%E4%BB%A4/s1.jpg" class=""><p><strong>说明：</strong></p><p> • 标签名和关系类型是非ASCII字符(例如中文)或者包含空格时，可以用反引号 (`)包含起来；</p><p> • 使用变量n1、n2… 来保存和引用创建了的节点； </p><p> • 可以在创建节点和关系的同时创建属性； </p><p> • 关系必须是有向的； • 这里使用通用的’关系’来代表人物之间的关系，仅作示例目的，并没有考虑实际建模的需要。</p><p><strong>在Cypher语句中：</strong> </p><p> • CREATE用来创建节点和属性 • 可以一次性创建多个节点和属性</p><p> • 可以使用变量保存创建的节点和属性</p><p> • 节点可以拥有一个或多个标签，也可以没有</p><p> • 关系必须指定关系类型</p><h3 id="2-查询图数据库"><a href="#2-查询图数据库" class="headerlink" title="2.查询图数据库"></a>2.查询图数据库</h3><p><strong>使用下面的Cypher语句：</strong></p><figure class="highlight plaintext"><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><code class="hljs cypher">match (n) return n;<br>或者<br>match path = () -- () return path;<br></code></pre></td></tr></table></figure><p>得到下面的数据</p><img src="/2024/02/26/Neo4j%E5%9F%BA%E7%A1%80%E5%91%BD%E4%BB%A4/s2.jpg" class=""><p><strong>二者的区别在于：</strong></p><figure class="highlight plaintext"><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><code class="hljs cypher">match (n) return n;<br>只返回所有的节点；Neo4j浏览器自动将节点之间的关系也从数据库中读取出来<br>match path = () -- () return path;<br>返回所有节点和关系<br></code></pre></td></tr></table></figure><p><strong>提示：</strong>可以取消这个选项让 Neo4j 浏览器不再自动读取结果节点中的关系</p><img src="/2024/02/26/Neo4j%E5%9F%BA%E7%A1%80%E5%91%BD%E4%BB%A4/s3.jpg" class=""><p><strong>下面演示更多的查询案例：</strong></p><figure class="highlight plaintext"><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><code class="hljs cypher">//寻找 刘备 的节点<br>match (n:人物{name:'刘备'}) retrurn n;<br>或者<br>match (n:人物) where n.name = '刘备' return n;<br><br>//查询 刘备 的兄弟<br>match (n:人物{name:'刘备'}) - [:关系{relationship:'兄长'}] -> (n1) return n1;<br><br>//寻找 刘备 的小弟（兄弟的兄弟）<br>match (n:人物{name:'刘备'}) - [:关系*2{relationship:'兄长'}] -> (n1) return n1;<br><br>//寻找 刘备 的所有社会关系，关系可以是双向<br>match (n:人物{name:'刘备'}) - [:关系] -> (n1) return n1;<br><br>如果说“兄弟的敌人是我的敌人”，试试看，能不能找到谁是张飞的敌人？<br>match (n:人物{name:'张飞'})-[:关系{relationship:'兄长'}]-(n1)-[:关系{relationship:'对手'}]-(n2) return n2;<br></code></pre></td></tr></table></figure><h3 id="3-更改和显示节点标签"><a href="#3-更改和显示节点标签" class="headerlink" title="3.更改和显示节点标签"></a>3.更改和显示节点标签</h3><figure class="highlight plaintext"><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><code class="hljs cypher">// 为 刘备 增加两个标签<br>match (n:人物{name:'刘备'}) set n:皇帝:好人;<br><br>// 显示 刘备 节点的标签和属性<br>match (n:人物{name:'刘备'}) return labels(n) AS nodeLabel ,keys(n) AS nodeProperties, n.name;<br><br>// 删除 刘备的 好人 标签<br>match (n:人物{name:'刘备'}) remove n:好人;<br><br>// 显示节点的标签和属性，以及关系的类型和属性，并以表状结构返回结果<br>match (n:人物{name:'刘备'}) -[r] -(n1) <br>return type(r) AS relationshipType, keys(r) AS relationshipProperties, labels(n1) AS nodeLabel,<br>Keys(n1) AS nodeProperties,n1.name;<br></code></pre></td></tr></table></figure><h3 id="4-更改属性"><a href="#4-更改属性" class="headerlink" title="4.更改属性"></a>4.更改属性</h3><figure class="highlight plaintext"><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><code class="hljs cypher">// 为 刘备 增加性别属性<br>match (n:人物{name:'刘备'}) set n.genre = '男';<br><br>// 删除 刘备 的性别标签，当属性值为空（null） 时s'j'k数据库会删除该属性<br>match (n:人物{name:'刘备'}) set n.genre = null;<br></code></pre></td></tr></table></figure><h3 id="5-删除节点和关系"><a href="#5-删除节点和关系" class="headerlink" title="5.删除节点和关系"></a>5.删除节点和关系</h3><figure class="highlight plaintext"><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><code class="hljs cypher">// 如果节点没有关系<br>match (n:人物{name:'刘备'}) delete n;<br> <br>// 然后节点有关系，使用 detach delete 会先删除连接到该节点的所有关系，然后再删除节点<br>match (n:人物{name:'刘备'}) detach delete n;<br> <br>// 删除所有节点，如果节点有关系，也删除节点<br>match (n) detach delete n;<br><br>// 仅删除关系，保留节点<br>match (n:人物{name:'刘备'}) -[r] -() delete r;<br></code></pre></td></tr></table></figure><p><strong>提示：</strong>删除全库也可以去删除 neo4j 安装目录下面的 <strong>data/databases/graph.db文件夹</strong>。</p><h3 id="6-关于-Id-的节点"><a href="#6-关于-Id-的节点" class="headerlink" title="6.关于 Id 的节点"></a>6.关于 Id 的节点</h3><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><code class="hljs cypher">// 根据数据库中的节点 Id 寻找节点<br>match (n) where id(n) = 0 return n;<br></code></pre></td></tr></table></figure>]]></content>
<categories>
<category>Neo4j</category>
</categories>
<tags>
<tag>Neo4j命令</tag>
</tags>
</entry>
<entry>
<title>Redis实现自增ID</title>
<link href="/2024/02/08/Redis%E5%AE%9E%E7%8E%B0%E8%87%AA%E5%A2%9EID/"/>
<url>/2024/02/08/Redis%E5%AE%9E%E7%8E%B0%E8%87%AA%E5%A2%9EID/</url>
<content type="html"><![CDATA[<h3 id="全局唯一ID生成策略"><a href="#全局唯一ID生成策略" class="headerlink" title="全局唯一ID生成策略"></a>全局唯一ID生成策略</h3><p><strong>·UUID</strong></p><p><strong>·Redis自增</strong></p><p><strong>·snowflake算法</strong></p><p><strong>·数据库自增</strong></p><h3 id="Redis-自增-ID-策略"><a href="#Redis-自增-ID-策略" class="headerlink" title="Redis 自增 ID 策略"></a>Redis 自增 ID 策略</h3><p class="note note-success"> 1. 每天一个key，方便统计订单量</p><p class="note note-success"> 2. ID构造是 <b>时间戳</b> + <b>计数器</b></p><p>实现代码：</p><figure class="highlight java"><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><code class="hljs java"><span class="hljs-meta">@Component</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">RedisIdWorker</span> {<br><br> <span class="hljs-meta">@Resource</span><br> <span class="hljs-keyword">private</span> StringRedisTemplate stringRedisTemplate;<br><br> <span class="hljs-comment">//开始时间戳</span><br> <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> <span class="hljs-type">long</span> <span class="hljs-variable">BEGIN_TIMESTAMP</span> <span class="hljs-operator">=</span> <span class="hljs-number">1640995200L</span>;<br><br> <span class="hljs-comment">//序列号的位数</span><br> <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> <span class="hljs-type">long</span> <span class="hljs-variable">COUNT_BITS</span> <span class="hljs-operator">=</span> <span class="hljs-number">32</span>;<br><br> <span class="hljs-keyword">public</span> <span class="hljs-type">long</span> <span class="hljs-title function_">nextId</span><span class="hljs-params">(String keyPrefix)</span> {<br> <span class="hljs-comment">// 1.生成时间戳</span><br> <span class="hljs-type">LocalDateTime</span> <span class="hljs-variable">now</span> <span class="hljs-operator">=</span> LocalDateTime.now();<br> <span class="hljs-type">long</span> <span class="hljs-variable">newSecond</span> <span class="hljs-operator">=</span> now.toEpochSecond(ZoneOffset.UTC);<br> <span class="hljs-type">long</span> <span class="hljs-variable">timestamp</span> <span class="hljs-operator">=</span> newSecond - BEGIN_TIMESTAMP;<br> <span class="hljs-comment">// 2.生成序列号</span><br> <span class="hljs-comment">// 2.1.获取当前日期，精确到天</span><br> <span class="hljs-type">String</span> <span class="hljs-variable">date</span> <span class="hljs-operator">=</span> now.format(DateTimeFormatter.ofPattern(<span class="hljs-string">"yyyy:MM:dd"</span>));<br> <span class="hljs-comment">// 2.2.自增长</span><br> <span class="hljs-type">long</span> <span class="hljs-variable">count</span> <span class="hljs-operator">=</span> stringRedisTemplate.opsForValue().increment(<span class="hljs-string">"icr:"</span> + keyPrefix + <span class="hljs-string">":"</span> + date);<br> <span class="hljs-comment">// 3.拼接并返回</span><br> <span class="hljs-keyword">return</span> timestamp << COUNT_BITS | count;<br> }<br>}<br></code></pre></td></tr></table></figure><p>创建一个500个线程池，然后创建一个任务，每一个任务来就执行100次，总共提交300次，测试代码：</p><figure class="highlight java"><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><code class="hljs java"><span class="hljs-meta">@Resource</span><br><span class="hljs-keyword">private</span> RedisIdWorker redisIdWorker;<br><br><span class="hljs-keyword">private</span> <span class="hljs-keyword">final</span> <span class="hljs-type">ExecutorService</span> <span class="hljs-variable">es</span> <span class="hljs-operator">=</span> Executors.newFixedThreadPool(<span class="hljs-number">500</span>);<br><br><span class="hljs-meta">@Test</span><br><span class="hljs-keyword">void</span> <span class="hljs-title function_">testIdWorker</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> InterruptedException {<br> <span class="hljs-type">CountDownLatch</span> <span class="hljs-variable">latch</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">CountDownLatch</span>(<span class="hljs-number">300</span>);<br> <span class="hljs-type">Runnable</span> <span class="hljs-variable">task</span> <span class="hljs-operator">=</span> () -> {<br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>; i < <span class="hljs-number">100</span>; i++) {<br> <span class="hljs-type">long</span> <span class="hljs-variable">id</span> <span class="hljs-operator">=</span> redisIdWorker.nextId(<span class="hljs-string">"order"</span>);<br> System.out.println(<span class="hljs-string">"id = "</span> + id);<br> }<br> latch.countDown();<br> };<br> <span class="hljs-type">long</span> <span class="hljs-variable">begin</span> <span class="hljs-operator">=</span> System.currentTimeMillis();<br> <span class="hljs-keyword">for</span> (<span class="hljs-type">int</span> <span class="hljs-variable">i</span> <span class="hljs-operator">=</span> <span class="hljs-number">0</span>; i < <span class="hljs-number">300</span>; i++) {<br> es.submit(task);<br> }<br> latch.await();<br> <span class="hljs-type">long</span> <span class="hljs-variable">end</span> <span class="hljs-operator">=</span> System.currentTimeMillis();<br><br> System.out.println(<span class="hljs-string">"time = "</span> + (end - begin));<br>}<br></code></pre></td></tr></table></figure><p>执行之后查看Redis，ID自增长到30000</p><img src="/2024/02/08/Redis%E5%AE%9E%E7%8E%B0%E8%87%AA%E5%A2%9EID/s1.jpg" class="">]]></content>
<categories>
<category>Redis</category>
</categories>
<tags>
<tag>唯一ID</tag>
</tags>
</entry>
<entry>
<title>Linux配置Neo4j</title>
<link href="/2024/02/07/Linux%E9%85%8D%E7%BD%AENeo4j/"/>
<url>/2024/02/07/Linux%E9%85%8D%E7%BD%AENeo4j/</url>
<content type="html"><![CDATA[<h3 id="1-Docker-镜像准备"><a href="#1-Docker-镜像准备" class="headerlink" title="1.Docker 镜像准备"></a>1.Docker 镜像准备</h3><p>我安装的是 <strong>3.5.5</strong>版本的，所以就是 ：docker pull neo4j:3.5.5</p><figure class="highlight dockerfile"><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></pre></td><td class="code"><pre><code class="hljs dockerfile">//寻找镜像<br>docker search neo4j<br><br>//拉取镜像<br>docker pull neo4j(:版本号) //缺省 “:版本号” 时默认安装latest版本的<br><br>//查看镜像<br>docker images<br></code></pre></td></tr></table></figure><h3 id="2、启动配置修改"><a href="#2、启动配置修改" class="headerlink" title="2、启动配置修改"></a>2、启动配置修改</h3><figure class="highlight dockerfile"><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></pre></td><td class="code"><pre><code class="hljs dockerfile">docker <span class="hljs-keyword">run</span><span class="language-bash"> -d --name container_name \ //-d表示容器后台运行 --name指定容器名字</span><br> -p <span class="hljs-number">7474</span>:<span class="hljs-number">7474</span> -p <span class="hljs-number">7687</span>:<span class="hljs-number">7687</span> \ //映射容器的端口号到宿主机的端口号<br> -v /home/neo4j/data:/data \ //把容器内的数据目录挂载到宿主机的对应目录下<br> -v /home/neo4j/logs:/logs \ //挂载日志目录<br> -v /home/neo4j/conf:/var/lib/neo4j/conf //挂载配置目录<br> -v /home/neo4j/import:/var/lib/neo4j/import \ //挂载数据导入目录<br> --<span class="hljs-keyword">env</span> NEO4J_AUTH=neo4j/password \ //设定数据库的名字的访问密码<br> neo4j:<span class="hljs-number">4.2</span>.<span class="hljs-number">2</span> //指定使用的镜像 及版本号 默认laster<br></code></pre></td></tr></table></figure><p>我的运行命令是：NEO4J_AUTH是可以指定的</p><figure class="highlight kotlin"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs kotlin">docker run -d --name neo4j -p <span class="hljs-number">7474</span>:<span class="hljs-number">7474</span> -p <span class="hljs-number">7687</span>:<span class="hljs-number">7687</span> -v /opt/elastdocker-<span class="hljs-number">1.19</span><span class="hljs-number">.0</span>/elasticsearch/<span class="hljs-keyword">data</span>/neo4j/<span class="hljs-keyword">data</span>:/<span class="hljs-keyword">data</span> -v /opt/elastdocker-<span class="hljs-number">1.19</span><span class="hljs-number">.0</span>/elasticsearch/<span class="hljs-keyword">data</span>/neo4j/logs:/logs -v /opt/elastdocker-<span class="hljs-number">1.19</span><span class="hljs-number">.0</span>/elasticsearch/<span class="hljs-keyword">data</span>/neo4j/conf:/<span class="hljs-keyword">var</span>/lib/neo4j/conf -v /opt/elastdocker-<span class="hljs-number">1.19</span><span class="hljs-number">.0</span>/elasticsearch/<span class="hljs-keyword">data</span>/neo4j/<span class="hljs-keyword">import</span>:/<span class="hljs-keyword">var</span>/lib/neo4j/<span class="hljs-keyword">import</span> --env NEO4J_AUTH=neo4j/<span class="hljs-number">200381</span> neo4j<br></code></pre></td></tr></table></figure><h3 id="3-查看是否成功运行"><a href="#3-查看是否成功运行" class="headerlink" title="3.查看是否成功运行"></a>3.查看是否成功运行</h3><p><strong>输入：</strong>docker ps 查看以运行的容器</p><img src="/2024/02/07/Linux%E9%85%8D%E7%BD%AENeo4j/s1.jpg" class=""><h3 id="4-浏览器查看"><a href="#4-浏览器查看" class="headerlink" title="4.浏览器查看"></a>4.浏览器查看</h3><p><a href="http://ip:7474/browser/">http://IP:7474/browser/</a></p><img src="/2024/02/07/Linux%E9%85%8D%E7%BD%AENeo4j/s2.jpg" class="">]]></content>
<categories>
<category>Docker</category>
</categories>
<tags>
<tag>Neo4j</tag>
</tags>
</entry>
<entry>
<title>黑马点评</title>
<link href="/2024/02/03/%E9%BB%91%E9%A9%AC%E7%82%B9%E8%AF%84/"/>
<url>/2024/02/03/%E9%BB%91%E9%A9%AC%E7%82%B9%E8%AF%84/</url>
<content type="html"><![CDATA[<p>在学习黑马的 Reids 时，P37 留了一个课后作业，不过应该写在 service 层里面而不是写在 controller 层里面。</p><figure class="highlight java"><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></pre></td><td class="code"><pre><code class="hljs java"><span class="hljs-meta">@RestController</span><br><span class="hljs-meta">@RequestMapping("/shop-type")</span><br><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title class_">ShopTypeController</span> {<br> <span class="hljs-meta">@Resource</span><br> <span class="hljs-keyword">private</span> IShopTypeService typeService;<br> <span class="hljs-meta">@Resource</span><br> <span class="hljs-keyword">private</span> StringRedisTemplate stringRedisTemplate;<br><br> <span class="hljs-meta">@GetMapping("list")</span><br> <span class="hljs-keyword">public</span> Result <span class="hljs-title function_">queryTypeList</span><span class="hljs-params">()</span> {<br><br> <span class="hljs-type">String</span> <span class="hljs-variable">key</span> <span class="hljs-operator">=</span> CACHE_SHOP_TYPE_KEY;<br> <span class="hljs-comment">// 1.查询redis缓存</span><br> List<String> typeJson = stringRedisTemplate.opsForList().range(key, <span class="hljs-number">0</span>, -<span class="hljs-number">1</span>);<br> <span class="hljs-comment">// 2.判断是否命中</span><br> <span class="hljs-keyword">if</span> (CollectionUtil.isNotEmpty(typeJson)) {<br> <span class="hljs-comment">// 2.0 如果为空对象(防止缓存穿透时存入的空对象)</span><br> <span class="hljs-keyword">if</span> (StrUtil.isBlank(typeJson.get(<span class="hljs-number">0</span>))) {<br> <span class="hljs-keyword">return</span> Result.fail(<span class="hljs-string">"商品分类信息为空！"</span>);<br> }<br> <span class="hljs-comment">// 2.1 命中则转换List<String> -> List<ShopType> 并返回、</span><br> List<ShopType> typeList = <span class="hljs-keyword">new</span> <span class="hljs-title class_">ArrayList</span><>();<br> <span class="hljs-keyword">for</span> (String jsonString : typeJson) {<br> <span class="hljs-type">ShopType</span> <span class="hljs-variable">shopType</span> <span class="hljs-operator">=</span> JSONUtil.toBean(jsonString, ShopType.class);<br> typeList.add(shopType);<br> }<br> <span class="hljs-keyword">return</span> Result.ok(typeList);<br> }<br> <span class="hljs-comment">// 3. 未命中，查询数据库</span><br> List<ShopType> typeList = typeService.query().orderByAsc(<span class="hljs-string">"sort"</span>).list();<br> <span class="hljs-comment">// 3.1 数据库中不存在</span><br> <span class="hljs-keyword">if</span> (CollectionUtil.isEmpty(typeList)) {<br> <span class="hljs-comment">// 添加空对象到redis，解决缓存穿透</span><br> stringRedisTemplate.opsForList().rightPushAll(key, CollectionUtil.newArrayList(<span class="hljs-string">""</span>));<br> stringRedisTemplate.expire(key, CACHE_NULL_TTL, TimeUnit.MINUTES);<br> <span class="hljs-comment">// 返回错误</span><br> <span class="hljs-keyword">return</span> Result.fail(<span class="hljs-string">"商品分类信息为空！"</span>);<br> }<br> <span class="hljs-comment">// 3.2 数据库中存在,转换List<ShopType> -> List<String> 类型</span><br> List<String> shopTypeList = <span class="hljs-keyword">new</span> <span class="hljs-title class_">ArrayList</span><>();<br> <span class="hljs-keyword">for</span> (ShopType shopType : typeList) {<br> <span class="hljs-type">String</span> <span class="hljs-variable">jsonStr</span> <span class="hljs-operator">=</span> JSONUtil.toJsonStr(shopType);<br> shopTypeList.add(jsonStr);<br> }<br> <span class="hljs-comment">// 4.写入redis缓存, 有顺序只能RPUSH</span><br> stringRedisTemplate.opsForList().rightPushAll(key, shopTypeList);<br> <span class="hljs-comment">// 5. 返回</span><br> <span class="hljs-keyword">return</span> Result.ok(typeList);<br><br><span class="hljs-comment">// List<ShopType> typeList = typeService</span><br><span class="hljs-comment">// .query().orderByAsc("sort").list();</span><br><span class="hljs-comment">// return Result.ok(typeList);</span><br> }<br></code></pre></td></tr></table></figure>]]></content>
<categories>
<category>Redis</category>
</categories>
<tags>
<tag>黑马点评</tag>
</tags>
</entry>
<entry>
<title>测试</title>
<link href="/2024/01/29/Boot%E6%95%B4%E5%90%88Redis%E6%90%AD%E5%BB%BA/"/>
<url>/2024/01/29/Boot%E6%95%B4%E5%90%88Redis%E6%90%AD%E5%BB%BA/</url>
<content type="html"><![CDATA[<p></p>]]></content>
<categories>
<category>测试</category>
</categories>
</entry>
</search>