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href="https://www.tutorialspoint.com/compile_java8_online.php"><i class="fa-fw fas fa-code"></i><span> 代码</span></a></div><div class="menus_item"><a class="site-page" href="/notice/"><i class="fa-fw fas fa-stream"></i><span> 公告</span></a></div><div class="menus_item"><a class="site-page" href="/website/"><i class="fa-fw fas fa-list"></i><span> 网址</span></a></div><div class="menus_item"><a class="site-page" href="/record/"><i class="fa-fw fas fa-bars"></i><span> 记录</span></a></div><div class="menus_item"><a class="site-page" href="https://jasonsgong.github.io"><i class="fa-fw fas fa-wave-square"></i><span> 镜像</span></a></div><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 主页</span></a></div></div><div id="toggle-menu"><a class="site-page" href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav></header><main class="layout" id="content-inner"><div id="post"><div id="post-info"><h1 class="post-title">Hive中使用UDF函数的简单示例</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2023-11-17T14:22:37.000Z" title="发表于 2023-11-17 22:22:37">2023-11-17</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-11-30T15:18:39.211Z" title="更新于 2023-11-30 23:18:39">2023-11-30</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E5%A4%A7%E6%95%B0%E6%8D%AE/">大数据</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">355</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>1分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Hive中使用UDF函数的简单示例"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div><article class="post-content" id="article-container"><h1 id="一-UDF函数介绍"><a href="#一-UDF函数介绍" class="headerlink" title="一.UDF函数介绍"></a>一.UDF函数介绍</h1><p> UDF：user difine function，用户自定义函数，在Hive的使用中，系统内置函数有时无法满足业务需求，这时就需要开发者自己编写函数来实现业务需求。</p>
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<h1 id="二-简单示例"><a href="#二-简单示例" class="headerlink" title="二.简单示例"></a>二.简单示例</h1><h2 id="1-创建一个maven工程"><a href="#1-创建一个maven工程" class="headerlink" title="1.创建一个maven工程"></a>1.创建一个maven工程</h2><p><strong>前置条件:</strong> Java环境，Maven环境，IDEA开发工具</p>
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<h2 id="2-在pom-xml文件中引入udf的依赖"><a href="#2-在pom-xml文件中引入udf的依赖" class="headerlink" title="2.在pom.xml文件中引入udf的依赖"></a>2.在pom.xml文件中引入udf的依赖</h2><figure class="highlight xml"><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"><span class="tag"><<span class="name">dependency</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">groupId</span>></span>org.apache.hive<span class="tag"></<span class="name">groupId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">artifactId</span>></span>hive-exec<span class="tag"></<span class="name">artifactId</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">version</span>></span>0.13.1<span class="tag"></<span class="name">version</span>></span></span><br><span class="line"><span class="tag"></<span class="name">dependency</span>></span></span><br></pre></td></tr></table></figure>
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<h2 id="3-编写udf函数"><a href="#3-编写udf函数" class="headerlink" title="3.编写udf函数"></a>3.编写udf函数</h2><p>创建一个java类继承UDF类，实现evaluate()方法，evaluate()方法可以重载</p>
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<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></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> org.apache.hadoop.hive.ql.exec.UDF;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MyUDF</span> <span class="keyword">extends</span> <span class="title class_">UDF</span>{</span><br><span class="line"> </span><br><span class="line"> <span class="comment">//计算两个年龄的差值</span></span><br><span class="line"> <span class="keyword">public</span> <span class="type">int</span> <span class="title function_">evaluate</span><span class="params">(<span class="type">int</span> firstAge, <span class="type">int</span> secondAge)</span>{</span><br><span class="line"> <span class="keyword">return</span> secondAge - firstAge;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">//根据身份证号提取生日信息</span></span><br><span class="line"> <span class="keyword">public</span> String <span class="title function_">evaluate</span><span class="params">(String idNumber)</span> {</span><br><span class="line"> <span class="keyword">if</span> ((idNumber != <span class="literal">null</span>) && idNumber.length() == <span class="number">18</span> && Pattern.matches(<span class="string">"^[0-9]+$"</span>, idNumber)) {</span><br><span class="line"> <span class="type">String</span> <span class="variable">year</span> <span class="operator">=</span> idNumber.substring(<span class="number">6</span>).substring(<span class="number">0</span>, <span class="number">4</span>);<span class="comment">// 得到年份</span></span><br><span class="line"> <span class="type">String</span> <span class="variable">month</span> <span class="operator">=</span> idNumber.substring(<span class="number">10</span>).substring(<span class="number">0</span>, <span class="number">2</span>);<span class="comment">// 得到月份</span></span><br><span class="line"> <span class="type">String</span> <span class="variable">day</span> <span class="operator">=</span> idNumber.substring(<span class="number">12</span>).substring(<span class="number">0</span>, <span class="number">2</span>);<span class="comment">// 得到日</span></span><br><span class="line"> <span class="keyword">return</span> year + <span class="string">"-"</span> + month + <span class="string">"-"</span> + day;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="string">""</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h2 id="4-将项目打成jar包上传到hdfs中"><a href="#4-将项目打成jar包上传到hdfs中" class="headerlink" title="4.将项目打成jar包上传到hdfs中"></a>4.将项目打成jar包上传到hdfs中</h2><p>使用maven工具先clean再package，然后将target目录下的jar包上传到hdfs中</p>
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<h2 id="5-在hive中创建udf函数"><a href="#5-在hive中创建udf函数" class="headerlink" title="5.在hive中创建udf函数"></a>5.在hive中创建udf函数</h2><figure class="highlight sql"><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"><span class="keyword">drop</span> <span class="keyword">function</span> if <span class="keyword">exists</span> MyUDF;</span><br><span class="line"><span class="keyword">create</span> <span class="keyword">function</span> MyUDF <span class="keyword">as</span> <span class="string">'com.udf.MyUDF'</span> <span class="keyword">using</span> jar <span class="string">'hdfs://xx/xxx.jar'</span>;</span><br></pre></td></tr></table></figure>
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<h2 id="6-测试使用"><a href="#6-测试使用" class="headerlink" title="6.测试使用"></a>6.测试使用</h2><figure class="highlight sql"><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"><span class="keyword">select</span> MyUDF(<span class="number">1</span>,<span class="number">3</span>); <span class="comment">-- 2</span></span><br><span class="line"><span class="keyword">select</span> MyUDF(<span class="string">'659452200103056489'</span>); <span class="comment">-- 2001-03-05</span></span><br></pre></td></tr></table></figure>
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href="#4-%E5%B0%86%E9%A1%B9%E7%9B%AE%E6%89%93%E6%88%90jar%E5%8C%85%E4%B8%8A%E4%BC%A0%E5%88%B0hdfs%E4%B8%AD"><span class="toc-text">4.将项目打成jar包上传到hdfs中</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#5-%E5%9C%A8hive%E4%B8%AD%E5%88%9B%E5%BB%BAudf%E5%87%BD%E6%95%B0"><span class="toc-text">5.在hive中创建udf函数</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#6-%E6%B5%8B%E8%AF%95%E4%BD%BF%E7%94%A8"><span class="toc-text">6.测试使用</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最近更新</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/posts/24183.html" title="任务进度"><img src="/img/4.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="任务进度"/></a><div class="content"><a class="title" href="/posts/24183.html" title="任务进度">任务进度</a><time datetime="2024-03-25T05:29:38.437Z" title="更新于 2024-03-25 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