Office Account 2008 中的ORM框架问题
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<![endif]--><p class="MsoNormal"><span lang="EN-US"><o:p>请问如何利用实体对象和关系建立SchemaGraph，然后生成数据库DDL。</o:p></span></p><p class="MsoNormal"><span lang="EN-US"><o:p><br></o:p></span></p><p class="MsoNormal"><span style="font-family: 宋体;">映射属性元编程实现</span><span lang="EN-US">Attribute2DDL</span></p>
<p class="MsoNormal"><span style="font-family: 宋体;">微软利用实体对象</span><span lang="EN-US">Entity</span><span style="font-family: 宋体;">的</span><span lang="EN-US">attribute</span><span style="font-family: 宋体;">属性、类的继承关系和外键关系生成</span><span lang="EN-US">SchemaGraph</span><span style="font-family: 宋体;">，然后再在数据库中创建相应的数据表</span><span lang="EN-US">Table</span><span style="font-family: 宋体;">，数据视图</span><span lang="EN-US">View</span><span style="font-family: 宋体;">和</span><span lang="EN-US">StoredProcedure</span><span style="font-family: 宋体;">。也就是通过这个</span><span lang="EN-US">ORM</span><span style="font-family: 宋体;">框架实现了</span><span lang="EN-US">Entity-</span><span style="font-family: 宋体;">》</span><span lang="EN-US">DataBase Schema</span><span style="font-family: 宋体;">的方式，和其他的</span><span lang="EN-US">ORM</span><span style="font-family: 宋体;">框架从</span><span lang="EN-US">DataBase Schema</span><span style="font-family: 宋体;">生成实体</span><span lang="EN-US">Entity</span><span style="font-family: 宋体;">的方式相反。</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family: 宋体;">个人认为这种才是完全基于面向对象</span><span lang="EN-US">OO</span><span style="font-family: 宋体;">的</span><span lang="EN-US">ORM</span><span style="font-family: 宋体;">框架。</span></p>
<p class="MsoNormal"><span style="font-family: 宋体;">可惜本人的数据结构</span><span lang="EN-US">Graph</span><span style="font-family: 宋体;">学得不好，不能看懂它其中由</span><span lang="EN-US">Entity</span><span style="font-family: 宋体;">和</span><span lang="EN-US">Entity Relation</span><span style="font-family: 宋体;">建立的</span><span lang="EN-US">SchemaGraph</span><span style="font-family: 宋体;">的代码。</span></p>
<p class="MsoNormal"><span lang="EN-US">SchemaGraph</span><span style="font-family: 宋体;">中含有</span><span lang="EN-US">Vertex</span><span style="font-family: 宋体;">，</span><span lang="EN-US">Edge</span><span style="font-family: 宋体;">的定义。可能是通过</span><span lang="EN-US">Graph</span><span style="font-family: 宋体;">的周游建立了</span><span lang="EN-US">SchemaGraph</span><span style="font-family: 宋体;">，由于</span><span lang="EN-US">OfficeAccount</span><span style="font-family: 宋体;">没有这个过程的代码，所以比较难懂。在软件的代码中只定义了软件数据库</span><span lang="EN-US">Schema</span><span style="font-family: 宋体;">升级的代码。</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family: 宋体;">大家在</span><span lang="EN-US">Entity</span><span style="font-family: 宋体;">和</span><span lang="EN-US">Entity Relation</span><span style="font-family: 宋体;">建立的</span><span lang="EN-US">SchemaGraph</span><span style="font-family: 宋体;">方面有什么好的建议吗</span></p><p class="MsoNormal"><br><span style="font-family: 宋体;"></span></p><p class="MsoNormal"><span style="font-family: 宋体;">具体文章见http://www.cnblogs.com/zengyongjoy/archive/2008/06/24/1228654.html<br></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p><br><span style="font-family: 宋体;"></span></p>
