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@@ -175,6 +175,124 @@ <h1 class="site-title">SMULET's BLOG</h1>
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<a href="/ComputerScience/%E5%9F%BA%E6%9C%AC%E6%93%8D%E4%BD%9C/Redis%E4%BD%BF%E7%94%A8/" class="post-title-link" itemprop="url">Redis使用</a>
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<span class="post-meta-item-text">发表于</span>
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<time title="创建时间：2024-10-27 00:00:00" itemprop="dateCreated datePublished" datetime="2024-10-27T00:00:00+08:00">2024-10-27</time>
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<time title="修改时间：2025-04-09 20:16:11" itemprop="dateModified" datetime="2025-04-09T20:16:11+08:00">2025-04-09</time>
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<h1 id="基本操作"><a class="markdownIt-Anchor" href="#基本操作"></a> 基本操作</h1>
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<h2 id="general"><a class="markdownIt-Anchor" href="#general"></a> General</h2>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line"># 返回给定模式的keys</span><br><span class="line">KEYS patter</span><br><span class="line">KEYS * # 返回全部</span><br><span class="line">KEYS set* # 返回set开头的keys</span><br><span class="line">EXISTS key</span><br><span class="line">TYPE key</span><br><span class="line">DEL key</span><br></pre></td></tr></table></figure>
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<h2 id="string"><a class="markdownIt-Anchor" href="#string"></a> String</h2>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">SET key value</span><br><span class="line">GET key</span><br><span class="line"># Set Extend Time</span><br><span class="line">SETEX key seconds value</span><br><span class="line"># Set When Key Not Exist</span><br><span class="line">SETNX key value</span><br></pre></td></tr></table></figure>
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<h2 id="hash"><a class="markdownIt-Anchor" href="#hash"></a> Hash</h2>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">HSET key field value</span><br><span class="line">HGET key field</span><br><span class="line">HDEL key field</span><br><span class="line"># Get All Fields</span><br><span class="line">HKEYS key</span><br><span class="line"># Get All Values</span><br><span class="line">HVALS key</span><br></pre></td></tr></table></figure>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">flowchart LR</span><br><span class="line"> key[key]</span><br><span class="line"> item[</span><br><span class="line"> field1: value1</span><br><span class="line"> field2: value2</span><br><span class="line"> ]</span><br><span class="line"> key --&gt; item</span><br></pre></td></tr></table></figure>
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<h2 id="list"><a class="markdownIt-Anchor" href="#list"></a> List</h2>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">LPUSH key value1 value2</span><br><span class="line"># Get Key From Start To Stop</span><br><span class="line">LRANGE key start stop</span><br><span class="line"># Right POP</span><br><span class="line">RPOP key</span><br><span class="line"># List Length</span><br><span class="line">LLEN key</span><br></pre></td></tr></table></figure>
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<h3 id="典型场景"><a class="markdownIt-Anchor" href="#典型场景"></a> 典型场景</h3>
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<h4 id="栈"><a class="markdownIt-Anchor" href="#栈"></a> 栈</h4>
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<h4 id="订阅消息"><a class="markdownIt-Anchor" href="#订阅消息"></a> 订阅消息</h4>
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<p>队列，先来后到</p>
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<ul>
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<li>如微信、微博订阅消息</li>
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<li>阻塞队列<code>B&lt;L|R&gt;POP</code>，队列为空就等待</li>
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<h2 id="set"><a class="markdownIt-Anchor" href="#set"></a> Set</h2>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">SADD key mem1 mem2</span><br><span class="line">SMEMBERS key</span><br><span class="line"># Set Size</span><br><span class="line">SCARD key</span><br><span class="line">SINTER key1 key2</span><br><span class="line">SUNION key1 key2</span><br><span class="line"># Delete</span><br><span class="line">SREM key mem1 mem2</span><br></pre></td></tr></table></figure>
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<h3 id="典型场景-2"><a class="markdownIt-Anchor" href="#典型场景-2"></a> 典型场景</h3>
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<h4 id="抽奖"><a class="markdownIt-Anchor" href="#抽奖"></a> 抽奖</h4>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">SADD lottery &#123;user_id&#125;</span><br><span class="line">SMEMBERS lottery</span><br><span class="line"># 开奖（适用于单个奖品）</span><br><span class="line">SRANDMEMBER lottery &#123;drawing_count&#125;</span><br><span class="line"># 开奖并删除（适用于多项奖品，不重复得奖）</span><br><span class="line">SPOP lottery &#123;drawing_count&#125;</span><br></pre></td></tr></table></figure>
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<h4 id="点赞-收藏-标签"><a class="markdownIt-Anchor" href="#点赞-收藏-标签"></a> 点赞、收藏、标签</h4>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line"># 点赞</span><br><span class="line">SADD like:&#123;msg_id&#125; &#123;user_id&#125;</span><br><span class="line"># 取消</span><br><span class="line">SREM like:&#123;msg_id&#125; &#123;user_id&#125;</span><br><span class="line"># 用户是否点赞</span><br><span class="line">SISMEMBER like:&#123;msg_id&#125; &#123;user_id&#125;</span><br><span class="line"># 点赞用户列表</span><br><span class="line">SMEMBERS like:&#123;msg_id&#125;</span><br><span class="line"># 点赞用户数</span><br><span class="line">SCARD like:&#123;msg_id&#125;</span><br></pre></td></tr></table></figure>
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<h4 id="关注-商品筛选"><a class="markdownIt-Anchor" href="#关注-商品筛选"></a> 关注、商品筛选</h4>
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<p>利用集合特性运算</p>
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<ul>
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<li>如共同关注、推荐关注</li>
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<li>商品筛选</li>
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<h2 id="sorted-set-zset"><a class="markdownIt-Anchor" href="#sorted-set-zset"></a> Sorted Set / ZSet</h2>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line">ZADD key score1 mem1 score2 mem2</span><br><span class="line"># Show List</span><br><span class="line">ZRANGE key start stop (WITHSCORES)</span><br><span class="line"># Increse Member</span><br><span class="line">ZINCRBY key increment member</span><br><span class="line">ZREM key mem1 mem2</span><br></pre></td></tr></table></figure>
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<h3 id="典型场景-3"><a class="markdownIt-Anchor" href="#典型场景-3"></a> 典型场景</h3>
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<h4 id="日月年热点排行榜"><a class="markdownIt-Anchor" href="#日月年热点排行榜"></a> 日/月/年热点排行榜</h4>
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<figure class="highlight plaintext"><table><tr><td class="code"><pre><span class="line"># 记录浏览量</span><br><span class="line">ZINCRBY hotNews:&#123;date&#125; 1 &#123;news_id&#125;</span><br><span class="line"># Top 10</span><br><span class="line">ZREVRANGE hotNews:&#123;date&#125; 0 9 WITHSCORES</span><br><span class="line"># Recent 7 days</span><br><span class="line">ZUNIONSTORE hotNews:&#123;start_date&#125;-&#123;end_date&#125; 0 9 WITHSCORES</span><br></pre></td></tr></table></figure>
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<h1 id="chapter2-指令计算机的语言"><a class="markdownIt-Anchor" href="#chapter2-指令计算机的语言"></a> Chapter2 指令：计算机的语言</h1>
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<p>本章将介绍MIPS汇编语言指令。</p>
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<h2 id="三条设计原则"><a class="markdownIt-Anchor" href="#三条设计原则"></a> 三条设计原则</h2>
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<li>简单源于规整 Simplicity favors regularity.</li>
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<li>越小越快 Smaller is faster.</li>
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<li>优秀的设计需要适宜的折中方案 Good design demands good compromises.</li>
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<h2 id="22-硬件的操作与操作数"><a class="markdownIt-Anchor" href="#22-硬件的操作与操作数"></a> 2.2 硬件的操作与操作数</h2>
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<h3 id="规整"><a class="markdownIt-Anchor" href="#规整"></a> 规整</h3>
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<p><code>add a, b, c // a = b + c</code> MIPS汇编语言使用这样的固定记法。<br />
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每条MIPS算术指令只执行1个操作，仅有3个变量。</p>
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<h3 id="操作数必须来自寄存器"><a class="markdownIt-Anchor" href="#操作数必须来自寄存器"></a> 操作数必须来自寄存器</h3>
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<p>变量f、g、h、i、j依次分配给$s0~$s4，编译下面的C语句</p>
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<figure class="highlight c"><table><tr><td class="code"><pre><span class="line">f = (g + h) - (i + j);</span><br><span class="line">---</span><br><span class="line">add $t0, $s1, $s2 <span class="comment">// t0 = s1 + s2</span></span><br><span class="line">add $t1, $s3, $s4</span><br><span class="line">sub $s0, $t0, $t1 <span class="comment">// s0 = t0 + t1</span></span><br></pre></td></tr></table></figure>
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<h3 id="数据传输"><a class="markdownIt-Anchor" href="#数据传输"></a> 数据传输</h3>
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<p>只有少量数据存在寄存器中，因此需要在存储器和寄存器间传输数据</p>
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<p>A的基址是存在$s3，编译下面的C语句</p>
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<figure class="highlight c"><table><tr><td class="code"><pre><span class="line">A[<span class="number">12</span>] = h + A[<span class="number">8</span>]</span><br><span class="line">---</span><br><span class="line">lw $t0, <span class="number">32</span>($s3) <span class="comment">// 先读数，再相加；32为偏移量，8*4byte</span></span><br><span class="line">add $t0, $s2, $t0</span><br><span class="line">sw $t0, <span class="number">48</span>($s3) <span class="comment">// 存数</span></span><br></pre></td></tr></table></figure>
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<h3 id="立即数"><a class="markdownIt-Anchor" href="#立即数"></a> 立即数</h3>
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<figure class="highlight c"><table><tr><td class="code"><pre><span class="line">addi $t0, $t1, <span class="number">4</span> <span class="comment">// t0 = t1 + 4；无需读取4，作为立即数相加</span></span><br><span class="line">subi $t0, $t1, <span class="number">4</span></span><br></pre></td></tr></table></figure>
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