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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>XDoclet 和 EJB 技术：ejb.persistence 标记</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 5 页（共16 页）</nobr></font></td>
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<p>EJB 规范未定义标准的 <i>OR</i> 映射。但是多数实现 EJB CMP CMR 的应用程序服务器使用相似的策略，即把实体映射到类，把字段映射到列。DeptBean EJB 组件将被映射到 <i>TBL_USER</i> 表。</p>
<p>在较旧的 XDoclet 版本中，每个供应商实现都有它们自己的 EJB CMP CMR 支持，但是它们似乎都为相同的目的选择不同的标记名。为了指定映射实体的表名，较新的 XDoclet 版本定义了 <code>ejb.persistence</code> 标记。</p>
<p>
我注意到 Resin XDoclet 模板尚不支持新的 <code>ejb.persistence</code> 标记。我添加了支持但是新模板没有被提交到项目中。实际上，为添加对新标记的支持而修改该模板是很容易的。</p>
<p>
以下代码使用供应商特有的 Resin 映射和中立于供应商的方式把数据库表映射到实体。目前，并不是所有的供应商产品都受到新标记的支持。如果供应商的模板已被更新以支持 ejb.persistence，那么供应商特有的映射标记是不必要的。</p>
<p>
						
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
 /**...
  * @resin-ejb.entity-bean     sql-table="DEPT"
  * @ejb.persistence           table-name="TBL_USER"
  *  ...
  */
 public abstract class DeptBean implements EntityBean {
 
     </code>
</pre>
					
</p>
<p>
以上标记生成供应商特有的映射文件中的以下代码。以 Resin 为例，代码如下。</p>
<p>
						
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
     &lt;!-- generated from ejb.DeptBean --&gt;
         &lt;entity&gt;
             &lt;ejb-name&gt;DeptBean&lt;/ejb-name&gt;
             &lt;sql-table&gt;DEPT&lt;/sql-table&gt;
 
             ...
     </code>
</pre>
					
</p>
<p>
请注意，这个示例只适用于这些应用程序服务器，但是您也可以使用许多其它服务器。目前，XDoclet 支持 Orion、Pramati、IBM WebSphere、BEA WebLogic、JRun、JBoss 和几个其它产品。</p>
<p>
并不是每个实现都有最好的支持和最新的模板。它是开放式源代码，所以各种支持有所不同。但是，为适用于其它供应商而更新现有的模板是相当容易的。</p>
<p>
Macromedia 的 JRun 为简化开发而支持模板本身，也就是说，这个商业公司支持和更新 XDoclet 模板和模块。我希望这成为潮流。但是，修改模板和创建模块是相当容易的，有许多示例可供您参考。</p>
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