zengli
/
coding-agent


			
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  <h1>3.2 Redis数据库简介与使用</h1>

<h2 id="_1">学习目标<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<ol>
<li>理解 Redis 数据库的基本原理及其在缓存和数据存储中的作用。</li>
<li>掌握如何使用 Python 的 <code>redis</code> 库进行数据存储和查询。</li>
<li>学会将 Redis 客户端集成到工程化代码中。</li>
</ol>
<hr />
<h2 id="redis">一、Redis 数据库概述<a class="headerlink" href="#redis" title="Permanent link">&para;</a></h2>
<p>Redis（Remote Dictionary Server）是一个高性能的键值对数据库，常用于缓存、会话管理等场景。它支持多种数据结构（如字符串、哈希、列表等），并提供快速的内存操作。</p>
<h3 id="1-redis">1 Redis 的核心特性<a class="headerlink" href="#1-redis" title="Permanent link">&para;</a></h3>
<ul>
<li><strong>高性能</strong>：数据存储在内存中，读写速度极快。</li>
<li><strong>持久化</strong>：支持 RDB 和 AOF 两种持久化方式。</li>
<li><strong>灵活性</strong>：支持多种数据类型和丰富命令。</li>
<li><strong>简单易用</strong>：提供直观的 API，易于集成。</li>
</ul>
<h3 id="2">2 应用场景<a class="headerlink" href="#2" title="Permanent link">&para;</a></h3>
<ul>
<li>缓存查询结果以减少数据库压力。</li>
<li>存储用户会话信息。</li>
<li>实现排行榜或计数器功能。</li>
</ul>
<hr />
<h2 id="_2">二、代码实现<a class="headerlink" href="#_2" title="Permanent link">&para;</a></h2>
<h3 id="1">1 整体结构<a class="headerlink" href="#1" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code>redis_lesson/
├── redis_client.py      # Redis 客户端模块
├── base.py             # 配置文件和日志模块
├── main.py             # 主程序入口
└── requirements.txt    # 依赖文件
</code></pre></div>
<h3 id="2_1">2 具体模块<a class="headerlink" href="#2_1" title="Permanent link">&para;</a></h3>
<h4 id="21-redis-redis_clientpy">2.1 Redis 客户端模块 (<code>redis_client.py</code>)<a class="headerlink" href="#21-redis-redis_clientpy" title="Permanent link">&para;</a></h4>
<div class="highlight"><pre><span></span><code><span class="kn">import</span><span class="w"> </span><span class="nn">redis</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">json</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">base</span><span class="w"> </span><span class="kn">import</span> <span class="n">Config</span><span class="p">,</span> <span class="n">logger</span>

<span class="k">class</span><span class="w"> </span><span class="nc">RedisClient</span><span class="p">:</span>
    <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">client</span> <span class="o">=</span> <span class="n">redis</span><span class="o">.</span><span class="n">StrictRedis</span><span class="p">(</span>
                <span class="n">host</span><span class="o">=</span><span class="n">Config</span><span class="p">()</span><span class="o">.</span><span class="n">REDIS_HOST</span><span class="p">,</span>
                <span class="n">port</span><span class="o">=</span><span class="n">Config</span><span class="p">()</span><span class="o">.</span><span class="n">REDIS_PORT</span><span class="p">,</span>
                <span class="n">password</span><span class="o">=</span><span class="n">Config</span><span class="p">()</span><span class="o">.</span><span class="n">REDIS_PASSWORD</span><span class="p">,</span>
                <span class="n">db</span><span class="o">=</span><span class="n">Config</span><span class="p">()</span><span class="o">.</span><span class="n">REDIS_DB</span><span class="p">,</span>
                <span class="n">decode_responses</span><span class="o">=</span><span class="kc">True</span>
            <span class="p">)</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Redis 连接成功&quot;</span><span class="p">)</span>
        <span class="k">except</span> <span class="n">redis</span><span class="o">.</span><span class="n">RedisError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Redis 连接失败: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
            <span class="k">raise</span>

    <span class="k">def</span><span class="w"> </span><span class="nf">set_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">value</span><span class="p">))</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;存储数据到 Redis: </span><span class="si">{</span><span class="n">key</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
        <span class="k">except</span> <span class="n">redis</span><span class="o">.</span><span class="n">RedisError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Redis 存储失败: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>

    <span class="k">def</span><span class="w"> </span><span class="nf">get_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">):</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">data</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
            <span class="k">return</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="k">if</span> <span class="n">data</span> <span class="k">else</span> <span class="kc">None</span>
        <span class="k">except</span> <span class="n">redis</span><span class="o">.</span><span class="n">RedisError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Redis 获取失败: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
            <span class="k">return</span> <span class="kc">None</span>

    <span class="k">def</span><span class="w"> </span><span class="nf">get_answer</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">query</span><span class="p">):</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="n">answer</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">client</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;answer:</span><span class="si">{</span><span class="n">query</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">answer</span><span class="p">:</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;从 Redis 获取答案: </span><span class="si">{</span><span class="n">query</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
                <span class="k">return</span> <span class="n">answer</span>
            <span class="k">return</span> <span class="kc">None</span>
        <span class="k">except</span> <span class="n">redis</span><span class="o">.</span><span class="n">RedisError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">logger</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Redis 查询失败: </span><span class="si">{</span><span class="n">e</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
            <span class="k">return</span> <span class="kc">None</span>
</code></pre></div>
<h4 id="22-mainpy">2.2 主程序 (<code>main.py</code>)<a class="headerlink" href="#22-mainpy" title="Permanent link">&para;</a></h4>
<div class="highlight"><pre><span></span><code><span class="kn">from</span><span class="w"> </span><span class="nn">redis_client</span><span class="w"> </span><span class="kn">import</span> <span class="n">RedisClient</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>

<span class="c1"># 配置日志</span>
<span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span><span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">,</span> <span class="nb">format</span><span class="o">=</span><span class="s1">&#39;</span><span class="si">%(asctime)s</span><span class="s1"> - </span><span class="si">%(levelname)s</span><span class="s1"> - </span><span class="si">%(message)s</span><span class="s1">&#39;</span><span class="p">)</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>

<span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">():</span>
    <span class="c1"># 初始化 Redis 客户端</span>
    <span class="n">redis_client</span> <span class="o">=</span> <span class="n">RedisClient</span><span class="p">()</span>
    <span class="c1"># 示例数据</span>
    <span class="n">key</span> <span class="o">=</span> <span class="s2">&quot;user:1&quot;</span>
    <span class="n">value</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;name&quot;</span><span class="p">:</span> <span class="s2">&quot;Alice&quot;</span><span class="p">,</span> <span class="s2">&quot;age&quot;</span><span class="p">:</span> <span class="mi">25</span><span class="p">}</span>
    <span class="c1"># 存储数据</span>
    <span class="n">redis_client</span><span class="o">.</span><span class="n">set_data</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span>
    <span class="c1"># 获取数据</span>
    <span class="n">result</span> <span class="o">=</span> <span class="n">redis_client</span><span class="o">.</span><span class="n">get_data</span><span class="p">(</span><span class="n">key</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">result</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;查询结果: </span><span class="si">{</span><span class="n">result</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;未找到数据&quot;</span><span class="p">)</span>
    <span class="c1"># 示例查询缓存</span>
    <span class="n">query</span> <span class="o">=</span> <span class="s2">&quot;test_query&quot;</span>
    <span class="n">answer</span> <span class="o">=</span> <span class="n">redis_client</span><span class="o">.</span><span class="n">get_answer</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
    <span class="k">if</span> <span class="n">answer</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;缓存答案: </span><span class="si">{</span><span class="n">answer</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">)</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;未找到缓存答案&quot;</span><span class="p">)</span>

<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">&quot;__main__&quot;</span><span class="p">:</span>
    <span class="n">main</span><span class="p">()</span>
</code></pre></div>
<h4 id="23-basepy">2.3 配置文件 (<code>base.py</code>)<a class="headerlink" href="#23-basepy" title="Permanent link">&para;</a></h4>
<div class="highlight"><pre><span></span><code><span class="kn">import</span><span class="w"> </span><span class="nn">logging</span>

<span class="c1"># 配置日志</span>
<span class="n">logging</span><span class="o">.</span><span class="n">basicConfig</span><span class="p">(</span><span class="n">level</span><span class="o">=</span><span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">,</span> <span class="nb">format</span><span class="o">=</span><span class="s1">&#39;</span><span class="si">%(asctime)s</span><span class="s1"> - </span><span class="si">%(levelname)s</span><span class="s1"> - </span><span class="si">%(message)s</span><span class="s1">&#39;</span><span class="p">)</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>

<span class="k">class</span><span class="w"> </span><span class="nc">Config</span><span class="p">:</span>
    <span class="n">REDIS_HOST</span> <span class="o">=</span> <span class="s2">&quot;localhost&quot;</span>
    <span class="n">REDIS_PORT</span> <span class="o">=</span> <span class="mi">6379</span>
    <span class="n">REDIS_PASSWORD</span> <span class="o">=</span> <span class="kc">None</span>
    <span class="n">REDIS_DB</span> <span class="o">=</span> <span class="mi">0</span>
</code></pre></div>
<h4 id="24-requirementstxt">2.4 依赖文件 (<code>requirements.txt</code>)<a class="headerlink" href="#24-requirementstxt" title="Permanent link">&para;</a></h4>
<div class="highlight"><pre><span></span><code>redis
</code></pre></div>
<hr />
<h2 id="_3">三、示例运行结果<a class="headerlink" href="#_3" title="Permanent link">&para;</a></h2>
<h3 id="1-mainpy">1 运行 <code>main.py</code><a class="headerlink" href="#1-mainpy" title="Permanent link">&para;</a></h3>
<p>假设 Redis 服务器运行在本地，输出如下：</p>
<div class="highlight"><pre><span></span><code>2025-05-12 10:00:01,123 - INFO - Redis 连接成功
2025-05-12 10:00:01,124 - INFO - 存储数据到 Redis: user:1
2025-05-12 10:00:01,125 - INFO - 查询结果: {&#39;name&#39;: &#39;Alice&#39;, &#39;age&#39;: 25}
2025-05-12 10:00:01,126 - INFO - 未找到缓存答案
</code></pre></div>
<h3 id="2_2">2 分析<a class="headerlink" href="#2_2" title="Permanent link">&para;</a></h3>
<ul>
<li>数据以 JSON 格式存储，适合复杂结构。</li>
<li><code>get_answer</code> 方法用于查询缓存，减少重复计算。</li>
<li>异常处理确保代码鲁棒性，避免 Redis 连接或操作失败导致程序崩溃。</li>
</ul>
<hr />
<h2 id="_4">本章小结<a class="headerlink" href="#_4" title="Permanent link">&para;</a></h2>
<p>本节主要介绍了 Redis 数据库的操作原理和应用：</p>
<ul>
<li><strong>原理</strong>：高性能键值对存储，适合缓存和快速数据访问。</li>
<li><strong>应用</strong>：通过 <code>redis</code> 库实现数据存储、查询和缓存。</li>
</ul>
<p>下一章将介绍如何将 Redis 与其他算法（如 BM25）结合，提升检索效率。</p>
<hr />


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