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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>XDoclet 和 EJB 技术：用供应商特有的标记来设置供应商特有的 OR 映射（或不）</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr> 第 10 页（共16 页）</nobr></font></td>
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<p>
<code>ejb.persistence</code> 标记使您能够指定从 cmp 字段到表的列的映射。以下是把 <code>ejb.persistence</code> 标记用于 <code>DeptBean</code> 的标识 CMP 字段的示例：
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
/**
* This is a cmp field. The cmp field is read only.
* And it is the primary key.
*
* @ejb.pk-field
* @ejb.persistent-field
* @ejb.interface-method view-type="local"
* @ejb.persistence column-name="DEPTID"
* @resin-ejb.cmp-field sql-column="DEPTID"
*/
public abstract Integer getId();
public abstract void setId(Integer id);
</code>
</pre>
</p>
<p>
请注意，以上 ejb.persistence 把标识 CMP 字段映射到 DEPTID 列。（在这个示例中，我还使用供应商特有的映射标记，因为并不是所有的供应商模板都支持新的 <code>ejb.persistence</code> 标记。）以上 XDoclet 标记将在供应商特有的 RDBMS 映射文件中生成以下映射。</p>
<p></p>
<p>Resin 的 resin.ejb
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
<!-- generated from ejb.DeptBean -->
<entity>
<ejb-name>DeptBean</ejb-name>
<sql-table>DEPT</sql-table>
<cmp-field>
<field-name>id</field-name>
<sql-column>DEPTID</sql-column>
</cmp-field>
</code>
</pre>
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