电脑/计算机理论/企业应用架构模式读书笔记.html

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<title>企业应用架构模式读书笔记</title>
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<h1 class="title">企业应用架构模式读书笔记</h1>
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<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#orgheadline1">1. 参考资料</a></li>
</ul>
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</nav>
<p>
软件的分层: 
</p>
<ol class="org-ol">
<li>表现层 提供服务，显示信息，处理用户请求，命令行调用，批处理API</li>
<li>领域层 逻辑，系统中真正的核心</li>
<li>数据源层 与数据库、消息系统、事务管理器及其他软件包通信</li>
</ol>

<p>
最核心的一个原则: 领域层和数据源层不应该依赖于表现层。
</p>

<p>
领域模型风格只有在领域逻辑复杂到一定程度的时候才有优势，而对于业务逻辑更加碎片话的后端来说，大部分时候处理的任务逻辑复杂度最多只能算得上中等，实现良好的表模块风格就能够很好的满足需要了，而且其所需要的额外的工作量最少。[参考企业应用架构模式图2-4]
</p>

<ol class="org-ol">
<li>查询操作尽可能牵涉较少的数据库，最好所有的查询信息入口都汇总为一个 数据库视图。</li>
<li>更改编辑操作尽可能集中在某几个数据库表格上，最后所有的更新编辑操作信息出口都汇总为一个 数据库视图。</li>
<li>上面的查询和编辑操作甚至可能合并为一个数据库视图，并且对该数据库视图某个字段数据的修改也会相应的修改，但视图对此支持功能还是很有限的，insert操作应该不能很好的支持，所以最好还是只是将视图作为查询入口。</li>
</ol>

<div class="outline-2">
<h2 id="orgheadline1">参考资料</h2>
<div class="outline-text-2" id="text-1">
<p>
企业应用架构模式 Martin Fowler 
</p>
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