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Diffstat (limited to '2025')
| -rw-r--r-- | 2025/01/19/身体往前倾,灵魂向后摇/index.html | 2 | ||||
| -rw-r--r-- | 2025/02/10/实时搜索中的防抖函数/index.html | 287 | ||||
| -rw-r--r-- | 2025/02/11/从事件风暴看领域驱动设计/index.html | 277 | ||||
| -rw-r--r-- | 2025/02/18/Prisma-关系型数据库的-Self-relations/index.html | 2 | ||||
| -rw-r--r-- | 2025/02/24/二〇二五年二月二十四日/index.html | 5 | ||||
| -rw-r--r-- | 2025/03/13/领域驱动设计中的“聚合根”/index.html | 282 |
6 files changed, 853 insertions, 2 deletions
diff --git a/2025/01/19/身体往前倾,灵魂向后摇/index.html b/2025/01/19/身体往前倾,灵魂向后摇/index.html index 6abbd905..53f1ff70 100644 --- a/2025/01/19/身体往前倾,灵魂向后摇/index.html +++ b/2025/01/19/身体往前倾,灵魂向后摇/index.html @@ -190,7 +190,7 @@ <div class="icon arrow-left"></div> <div class="post-link"> - <a href="/2025/02/18/Prisma-%E5%85%B3%E7%B3%BB%E5%9E%8B%E6%95%B0%E6%8D%AE%E5%BA%93%E7%9A%84-Self-relations/">Prev</a> + <a href="/2025/02/10/%E5%AE%9E%E6%97%B6%E6%90%9C%E7%B4%A2%E4%B8%AD%E7%9A%84%E9%98%B2%E6%8A%96%E5%87%BD%E6%95%B0/">Prev</a> </div> </div> diff --git a/2025/02/10/实时搜索中的防抖函数/index.html b/2025/02/10/实时搜索中的防抖函数/index.html new file mode 100644 index 00000000..614e7b9c --- /dev/null +++ b/2025/02/10/实时搜索中的防抖函数/index.html @@ -0,0 +1,287 @@ +<!DOCTYPE html> +<html lang="en"> + <head> + <meta charset="UTF-8"> +<meta name="viewport" + content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> +<meta http-equiv="X-UA-Compatible" content="ie=edge"> + + <meta name="author" content="韩暮秋"> + + + <meta name="subtitle" content="暮秋小屋"> + + + <meta name="description" content="这里是暮秋小屋,思念和灵感的寄存处"> + + + <meta name="keywords" content="韩暮秋,MuqiuHan,'Muqiu Han', 'muqiu han', muqiuhan"> + + + + +<title>实时搜索中的防抖函数 | 暮秋小屋</title> + + + + <link rel="icon" href="/favicon.ico"> + + + +<style> + @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&family=Roboto+Mono&display=swap'); +</style> + + + + <!-- stylesheets list from _config.yml --> + + <link rel="stylesheet" href="/css/style.css"> + + + + + + <!-- scripts list from _config.yml --> + + <script src="/js/frame.js"></script> + + + + + + <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script> + <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script> + + + + + + + + <meta name="generator" content="Hexo 6.3.0"></head> + <body> + <div class="mask-border"> + </div> + + <div class="wrapper"> + + <div class="header"> + <div class="flex-container"> + <div class="header-inner"> + <div class="site-brand-container"> + <a href="/"> + + 暮秋小屋 + + </a> + </div> + <div id="menu-btn" class="menu-btn" onclick="toggleMenu()"> + Menu + </div> + <nav class="site-nav"> + <ul class="menu-list"> + + + <li class="menu-item"> + <a href="/">主页</a> + </li> + + + + <li class="menu-item"> + <a href="/categories/gallery/">日记本</a> + </li> + + + + <li class="menu-item"> + <a href="/tags/Medicine/">医学</a> + </li> + + + + <li class="menu-item"> + <a href="/tags/Technique/">计算机科学</a> + </li> + + + + <li class="menu-item"> + <a href="/tags/Life/">生活</a> + </li> + + + + <li class="menu-item"> + <a href="/about">关于</a> + </li> + + + + <li class="menu-item search-btn"> + <a href="#">Search</a> + </li> + + </ul> + </nav> + </div> + </div> +</div> + + + <div class="main"> + <div class="flex-container"> + <article id="post"> + + + <div class="post-head"> + <div class="post-info"> + <div class="tag-list"> + + + <span class="post-tag"> + <a href="/tags/Technique/"> + Technique + </a> + </span> + + <span class="post-tag"> + <a href="/tags/Web/"> + Web + </a> + </span> + + + </div> + <div class="post-title"> + + + 实时搜索中的防抖函数 + + + </div> + <span class="post-date"> + Feb 10, 2025 + </span> + </div> + <div class="post-img"> + + <div class="h-line-primary"></div> + + </div> +</div> + <div class="post-content"> + <p>在实现实时搜索功能时,通常会使用输入框的事件监听器来捕获用户的输入变化,并在输入变化时发送搜索请求。为了避免过多的请求导致服务器负担过重,通常会使用“防抖”(debounce)技术来控制请求的频率。</p> +<h3 id="实现步骤"><a href="#实现步骤" class="headerlink" title="实现步骤"></a>实现步骤</h3><ol> +<li><strong>监听输入框的变化</strong>:使用<code>input</code>事件监听器来捕获用户的输入变化。</li> +<li><strong>防抖处理</strong>:使用防抖函数来限制请求的频率。防抖函数会在用户停止输入一段时间后才发送请求。</li> +<li><strong>发送请求</strong>:在防抖函数中调用搜索请求。</li> +</ol> +<h3 id="防抖函数示例"><a href="#防抖函数示例" class="headerlink" title="防抖函数示例"></a>防抖函数示例</h3><p>以下是一个简单的防抖函数示例:</p> +<figure class="highlight javascript"><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><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span>(<span class="params">func, wait</span>) {</span><br><span class="line"> <span class="keyword">let</span> timeout;</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">function</span>(<span class="params">...args</span>) {</span><br><span class="line"> <span class="keyword">const</span> context = <span class="variable language_">this</span>;</span><br><span class="line"> <span class="built_in">clearTimeout</span>(timeout);</span><br><span class="line"> timeout = <span class="built_in">setTimeout</span>(<span class="function">() =></span> func.<span class="title function_">apply</span>(context, args), wait);</span><br><span class="line"> };</span><br><span class="line">}</span><br></pre></td></tr></table></figure> + +<h3 id="实现实时搜索"><a href="#实现实时搜索" class="headerlink" title="实现实时搜索"></a>实现实时搜索</h3><p>假设你有一个输入框用于搜索患者:</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><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></pre></td><td class="code"><pre><span class="line"><script></span><br><span class="line"> import { onMount } from 'svelte';</span><br><span class="line"> import { patientsStore } from '$lib/stores/patients.svelte';</span><br><span class="line"></span><br><span class="line"> let searchTerm = '';</span><br><span class="line"></span><br><span class="line"> // 防抖函数</span><br><span class="line"> function debounce(func, wait) {</span><br><span class="line"> let timeout;</span><br><span class="line"> return function(...args) {</span><br><span class="line"> const context = this;</span><br><span class="line"> clearTimeout(timeout);</span><br><span class="line"> timeout = setTimeout(() => func.apply(context, args), wait);</span><br><span class="line"> };</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> // 搜索函数</span><br><span class="line"> const searchPatients = debounce(async (term) => {</span><br><span class="line"> if (term) {</span><br><span class="line"> // 发送搜索请求</span><br><span class="line"> const response = await fetch(`/api/search-patients?query=${term}`);</span><br><span class="line"> const data = await response.json();</span><br><span class="line"> patientsStore.mbglPatients = data;</span><br><span class="line"> } else {</span><br><span class="line"> // 清空搜索结果或恢复默认数据</span><br><span class="line"> patientsStore.mbglPatients = [];</span><br><span class="line"> }</span><br><span class="line"> }, 300); // 300ms 的防抖时间</span><br><span class="line"></span><br><span class="line"> // 监听输入框变化</span><br><span class="line"> function handleInput(event) {</span><br><span class="line"> searchTerm = event.target.value;</span><br><span class="line"> searchPatients(searchTerm);</span><br><span class="line"> }</span><br><span class="line"></script></span><br><span class="line"></span><br><span class="line"><input type="text" placeholder="搜索患者..." on:input={handleInput} bind:value={searchTerm} /></span><br></pre></td></tr></table></figure> + +<h3 id="请求发送间隔"><a href="#请求发送间隔" class="headerlink" title="请求发送间隔"></a>请求发送间隔</h3><ul> +<li><strong>防抖时间</strong>:通常设置为 300ms 到 500ms 之间。这个时间足够让用户完成输入并减少不必要的请求。</li> +<li><strong>考虑用户体验</strong>:防抖时间过短可能导致过多请求,过长则可能让用户感到延迟。300ms 是一个常用的折中值。</li> +</ul> +<p>通过这种方式,你可以实现一个高效的实时搜索功能,既能保证用户体验,又能减少服务器的负担。</p> + +</div> + +<script> + window.onload = detectors(); +</script> + <div class="post-footer"> + <div class="h-line-primary"></div> + <nav class="post-nav"> + <div class="prev-item"> + + <div class="icon arrow-left"></div> + <div class="post-link"> + <a href="/2025/02/11/%E4%BB%8E%E4%BA%8B%E4%BB%B6%E9%A3%8E%E6%9A%B4%E7%9C%8B%E9%A2%86%E5%9F%9F%E9%A9%B1%E5%8A%A8%E8%AE%BE%E8%AE%A1/">Prev</a> + </div> + + </div> + <div class="next-item"> + + <div class="icon arrow-right"></div> + <div class="post-link"> + <a href="/2025/01/19/%E8%BA%AB%E4%BD%93%E5%BE%80%E5%89%8D%E5%80%BE%EF%BC%8C%E7%81%B5%E9%AD%82%E5%90%91%E5%90%8E%E6%91%87/">Next</a> + </div> + + </div> + </nav> +</div> + + + <div class="post-comment"> + + + + + + + +</div> + + +</article> + </div> + </div> + + <div class="footer"> + <div class="flex-container"> + <div class="footer-text"> + + + | + + + 希望路过的人可以添点柴火让这里暖和点 + + </div> + </div> +</div> + + </div> + + + <div class="search-popup"> + <div class="search-popup-overlay"> + </div> + <div class="search-popup-window" > + <div class="search-header"> + <div class="search-input-container"> + <input autocomplete="off" autocapitalize="off" maxlength="80" + placeholder="Search Anything" spellcheck="false" + type="search" class="search-input"> + </div> + <div class="search-close-btn"> + <div class="icon close-btn"></div> + </div> + </div> + <div class="search-result-container"> + </div> + </div> +</div> + +<script> + const searchConfig = { + path : "/search.xml", + top_n_per_article: "1", + unescape : "false", + trigger: "auto", + preload: "false" + } +</script> +<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/search.js"></script> +<script src="/js/search.js"></script> + + + + </body> +</html> diff --git a/2025/02/11/从事件风暴看领域驱动设计/index.html b/2025/02/11/从事件风暴看领域驱动设计/index.html new file mode 100644 index 00000000..d7d6ef41 --- /dev/null +++ b/2025/02/11/从事件风暴看领域驱动设计/index.html @@ -0,0 +1,277 @@ +<!DOCTYPE html> +<html lang="en"> + <head> + <meta charset="UTF-8"> +<meta name="viewport" + content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> +<meta http-equiv="X-UA-Compatible" content="ie=edge"> + + <meta name="author" content="韩暮秋"> + + + <meta name="subtitle" content="暮秋小屋"> + + + <meta name="description" content="这里是暮秋小屋,思念和灵感的寄存处"> + + + <meta name="keywords" content="韩暮秋,MuqiuHan,'Muqiu Han', 'muqiu han', muqiuhan"> + + + + +<title>从事件风暴看领域驱动设计 | 暮秋小屋</title> + + + + <link rel="icon" href="/favicon.ico"> + + + +<style> + @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&family=Roboto+Mono&display=swap'); +</style> + + + + <!-- stylesheets list from _config.yml --> + + <link rel="stylesheet" href="/css/style.css"> + + + + + + <!-- scripts list from _config.yml --> + + <script src="/js/frame.js"></script> + + + + + + <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script> + <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script> + + + + + + + + <meta name="generator" content="Hexo 6.3.0"></head> + <body> + <div class="mask-border"> + </div> + + <div class="wrapper"> + + <div class="header"> + <div class="flex-container"> + <div class="header-inner"> + <div class="site-brand-container"> + <a href="/"> + + 暮秋小屋 + + </a> + </div> + <div id="menu-btn" class="menu-btn" onclick="toggleMenu()"> + Menu + </div> + <nav class="site-nav"> + <ul class="menu-list"> + + + <li class="menu-item"> + <a href="/">主页</a> + </li> + + + + <li class="menu-item"> + <a href="/categories/gallery/">日记本</a> + </li> + + + + <li class="menu-item"> + <a href="/tags/Medicine/">医学</a> + </li> + + + + <li class="menu-item"> + <a href="/tags/Technique/">计算机科学</a> + </li> + + + + <li class="menu-item"> + <a href="/tags/Life/">生活</a> + </li> + + + + <li class="menu-item"> + <a href="/about">关于</a> + </li> + + + + <li class="menu-item search-btn"> + <a href="#">Search</a> + </li> + + </ul> + </nav> + </div> + </div> +</div> + + + <div class="main"> + <div class="flex-container"> + <article id="post"> + + + <div class="post-head"> + <div class="post-info"> + <div class="tag-list"> + + + <span class="post-tag"> + <a href="/tags/Technique/"> + Technique + </a> + </span> + + + </div> + <div class="post-title"> + + + 从事件风暴看领域驱动设计 + + + </div> + <span class="post-date"> + Feb 11, 2025 + </span> + </div> + <div class="post-img"> + + <div class="h-line-primary"></div> + + </div> +</div> + <div class="post-content"> + <p>事件风暴(Event Storming)是一种领域驱动设计(DDD)的实践方法,由 Alberto Brandolini 提出,旨在通过团队协作的方式快速理解和建模业务领域。</p> +<p>以下是事件风暴及相关领域驱动设计中的一些核心概念和知识点:</p> +<p>1. 领域(Domain):指的是业务相关知识的集合,可以进一步划分为子域。<br>2. 子域(Subdomain):是领域的一部分,可以是核心域、支撑域或通用域。<br>3. 核心域(Core Domain):指领域中最核心的部分,通常对应企业的核心业务。<br>4. 通用语言(Ubiquitous Language):团队所有成员使用的一种语言,用于确保业务和软件之间的沟通一致性。<br>5. 限界上下文(Bounded Context):定义了一组规则和协议,用于明确领域模型的适用范围。<br>6. 实体(Entity):具有唯一标识和生命周期的领域对象。<br>7. 值对象(Value Object):描述了某种特性或属性的对象,没有概念标识。<br>8. 聚合(Aggregate):一组相关对象的集合,由一个聚合根(Aggregate Root)统一管理。<br>9. 领域事件(Domain Event):领域中发生的重要事件,可以用于通知其他领域对象或跨限界上下文进行解耦和协作。<br>10. 命令(Command):表示要执行的操作,通常与事件一一对应。<br>11. 读模型(Read Model):为了优化读取操作而设计的模型,可能与写模型不同。<br>12. 决策命令(Decision Command):在事件风暴中,直接导致事件发生的命令。<br>13. 战略设计(Strategic Design):高层次的抽象和归类,包括理清上下文和子域的划分。<br>14. 战术设计(Tactical Design):对特定上下文下的模型进行详细设计,包括聚合、实体和值对象。<br>15. 贫血模型(Anemic Domain Model):领域对象只有属性及其getter/setter方法的纯数据类,业务逻辑通过服务实现。<br>16. 充血模型(Rich Domain Model):领域对象包含业务逻辑,每个对象都是活跃的。<br>17. 资源库(Repository):用于检索和持久化领域对象的机制。<br>18. 服务(Service):在模型中独立的操作,可以是领域服务或应用服务。<br>19. 固定规则(Invariant):为设计元素做出的断言,必须一直保持为真。</p> +<p>事件风暴通常包括以下步骤:</p> +<ul> +<li>识别领域事件</li> +<li>确定事件顺序</li> +<li>识别命令和触发器</li> +<li>识别聚合和实体</li> +<li>划分限界上下文</li> +<li>识别领域服务和资源库</li> +<li>通过这些步骤,团队可以共同创建出反映业务领域的领域模型,为软件设计和开发提供指导。</li> +</ul> + +</div> + +<script> + window.onload = detectors(); +</script> + <div class="post-footer"> + <div class="h-line-primary"></div> + <nav class="post-nav"> + <div class="prev-item"> + + <div class="icon arrow-left"></div> + <div class="post-link"> 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content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> +<meta http-equiv="X-UA-Compatible" content="ie=edge"> + + <meta name="author" content="韩暮秋"> + + + <meta name="subtitle" content="暮秋小屋"> + + + <meta name="description" content="这里是暮秋小屋,思念和灵感的寄存处"> + + + <meta name="keywords" content="韩暮秋,MuqiuHan,'Muqiu Han', 'muqiu han', muqiuhan"> + + + + +<title>领域驱动设计中的“聚合根” | 暮秋小屋</title> + + + + <link rel="icon" href="/favicon.ico"> + + + +<style> + @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&family=Roboto+Mono&display=swap'); +</style> + + + + <!-- stylesheets list from _config.yml --> + + <link rel="stylesheet" href="/css/style.css"> + + + + + + <!-- scripts list from _config.yml --> + + <script src="/js/frame.js"></script> + + + + + + <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script> + <script id="MathJax-script" async 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+ </li> + + </ul> + </nav> + </div> + </div> +</div> + + + <div class="main"> + <div class="flex-container"> + <article id="post"> + + + <div class="post-head"> + <div class="post-info"> + <div class="tag-list"> + + + <span class="post-tag"> + <a href="/tags/Technique/"> + Technique + </a> + </span> + + <span class="post-tag"> + <a href="/tags/Software-Engineering/"> + Software Engineering + </a> + </span> + + + </div> + <div class="post-title"> + + + 领域驱动设计中的“聚合根” + + + </div> + <span class="post-date"> + Mar 13, 2025 + </span> + </div> + <div class="post-img"> + + <div class="h-line-primary"></div> + + </div> +</div> + <div class="post-content"> + <p>在领域驱动设计(Domain-Driven Design,简称DDD)中,聚合根(Aggregate Root)是聚合(Aggregate)中的核心实体,是一个聚合的入口点和控制者,负责维护聚合内部的一致性和不变性条件。聚合是一组紧密相关的领域对象的集合,这些对象通过一定的业务规则绑定在一起,并被视为一个单元。</p> +<p>主要的作用如下:</p> +<ul> +<li><strong>维护不变性</strong>:聚合根确保聚合内所有对象的一致性和不变性条件不被破坏。它负责封装与聚合相关的业务逻辑,保证聚合内的对象符合业务规则。</li> +<li><strong>管理生命周期</strong>:聚合根负责管理其内部对象的创建、修改和删除。它控制着聚合内部成员的生命周期,包括它们的创建、更新和删除。</li> +<li><strong>处理业务逻辑</strong>:聚合根负责处理与聚合相关的业务逻辑和操作,外部系统通过调用聚合根的方法来执行这些操作。它不仅是数据的容器,还负责封装与聚合相关的业务逻辑。</li> +</ul> +<p>其具有以下特性:</p> +<ul> +<li><strong>唯一入口</strong>:聚合根是聚合内部对象的唯一入口,外部系统只能与聚合根交互,而无法直接访问聚合内部的其他对象。这样可以避免外部系统直接修改聚合内的实体,确保聚合的一致性和业务逻辑的完整性。</li> +<li><strong>标识唯一性</strong>:每个聚合根都有一个全局唯一的标识符(ID),用以区分不同的聚合实例。</li> +<li><strong>事务边界</strong>:聚合根常常作为事务的边界,确保事务内的所有操作要么全部成功,要么全部失败,以此来维护数据的完整性。</li> +</ul> +<p>用 F# 来描述,以订单管理为例,大概写一下:</p> +<figure class="highlight fsharp"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">type</span> <span class="title class_">OrderStatus</span> <span class="operator">=</span> </span><br><span class="line"> <span class="operator">|</span> New</span><br><span class="line"> <span class="operator">|</span> Shipped</span><br><span class="line"> <span class="operator">|</span> Delivered</span><br><span class="line"> <span class="operator">|</span> Cancelled</span><br><span class="line"></span><br><span class="line"><span class="keyword">type</span> <span class="title class_">OrderItem</span> (productName<span class="operator">:</span> <span class="type">string</span>, price<span class="operator">:</span> <span class="type">float</span>, quantity<span class="operator">:</span> <span class="type">int</span>) <span class="operator">=</span> </span><br><span class="line"> <span class="keyword">do</span></span><br><span class="line"> <span class="keyword">if</span> quantity <span class="operator"><=</span> <span class="number">0</span> <span class="keyword">then</span></span><br><span class="line"> <span class="built_in">failwith</span> <span class="string">"Quantity must be positive"</span></span><br><span class="line"> </span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.ProductName <span class="operator">=</span> productName</span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.Price <span class="operator">=</span> price</span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.Quantity <span class="operator">=</span> quantity</span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.TotalPrice () <span class="operator">=</span> price <span class="operator">*</span> quantity</span><br><span class="line"></span><br><span class="line"><span class="keyword">type</span> <span class="title class_">Order</span> (<span class="built_in">id</span><span class="operator">:</span> <span class="type">int</span>, customerName<span class="operator">:</span> <span class="type">string</span>) <span class="operator">=</span> </span><br><span class="line"> <span class="keyword">let</span> <span class="keyword">mutable</span> status <span class="operator">=</span> OrderStatus.New</span><br><span class="line"> <span class="keyword">let</span> <span class="keyword">mutable</span> orderItems <span class="operator">=</span> []</span><br><span class="line"></span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.Id <span class="operator">=</span> <span class="built_in">id</span></span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.CustomerName <span class="operator">=</span> customerName</span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.Status <span class="operator">=</span> status</span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.OrderItems <span class="operator">=</span> orderItems</span><br><span class="line"></span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.AddItem (item<span class="operator">:</span> OrderItem, price<span class="operator">:</span> <span class="type">float</span>, quantity<span class="operator">:</span> <span class="type">int</span>) <span class="operator">=</span></span><br><span class="line"> <span class="keyword">if</span> quantity <span class="operator"><=</span> <span class="number">0</span> <span class="keyword">then</span></span><br><span class="line"> <span class="built_in">failwith</span> <span class="string">"Quantity must be positive"</span></span><br><span class="line"> </span><br><span class="line"> orderItems <span class="operator"><-</span> orderItems <span class="operator">@</span> [OrderItem(item.ProductName, price, quantity)]</span><br><span class="line"></span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.ChangeStatus (status<span class="operator">:</span> OrderStatus) <span class="operator">=</span></span><br><span class="line"> this.Status <span class="operator"><-</span> status</span><br><span class="line"></span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.TotalPrice () <span class="operator">=</span></span><br><span class="line"> orderItems <span class="operator">|></span> List.sumBy (<span class="keyword">fun</span> item <span class="operator">-></span> item.TotalPrice())</span><br><span class="line"></span><br><span class="line"> <span class="keyword">member</span> <span class="keyword">public</span> this.GetTotalPrice () <span class="operator">=</span></span><br><span class="line"> orderItems <span class="operator">|></span> List.sumBy (<span class="keyword">fun</span> item <span class="operator">-></span> item.TotalPrice())</span><br></pre></td></tr></table></figure> + +<p>在这个例子中,<code>Order</code> 是聚合根,它通过 <code>AddItem</code> 方法来添加订单项,保证每个订单项符合业务规则。同时,聚合根 <code>Order</code> 还负责订单状态的管理,例如通过 <code>ChangeStatus</code> 方法来更新订单状态。<code>OrderItem</code> 是聚合内的一个实体,表示订单项,它通过 <code>GetTotalPrice</code> 方法来计算每个订单项的总价。外部系统只能通过 <code>Order</code> 聚合根来访问和操作订单项,而不能直接访问或修改 <code>OrderItem</code></p> + +</div> + +<script> + window.onload = detectors(); +</script> + <div class="post-footer"> + <div class="h-line-primary"></div> + <nav class="post-nav"> + <div class="prev-item"> + + </div> + <div class="next-item"> + + <div class="icon arrow-right"></div> + <div class="post-link"> + <a href="/2025/02/24/%E4%BA%8C%E3%80%87%E4%BA%8C%E4%BA%94%E5%B9%B4%E4%BA%8C%E6%9C%88%E4%BA%8C%E5%8D%81%E5%9B%9B%E6%97%A5/">Next</a> + </div> + + </div> + </nav> +</div> + + + <div class="post-comment"> + + + + + + + +</div> + + +</article> + </div> + </div> + + <div class="footer"> + <div class="flex-container"> + <div 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