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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>XDoclet 和 EJB 技术：设置两个实体之间 OR 关系映射</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 13 页（共16 页）</nobr></font></td>
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<p>
至此，您已定义了两个 bean 之间的关系。这总共没有多少 bean，除非您添加有关底层数据库表的关系映射的详细信息。生成的供应商实现需要这些映射，这样它就知道如何实现关系。</p>
<p>
很不幸，XDoclet 没有指定 OR 关系映射的共同的方式。目前，您必须学习每一组供应商特有的标记。以下示例使用中立于供应商的标记和 Resin 的 OR 关系映射标记。</p>
<p>
						
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
     /**
     * @return Return the group this user is in.
     *
         ...
     *
     * @resin-ejb.relation    sql-column="DEPTID"
     * 
     *
     */
     public abstract Dept getDept();
     /** @ejb:interface-method view-type="local" */
     public abstract void setDept(Dept dept);
 
     </code>
</pre>
					
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<p>
<code>resin-ejb.relation</code> 标记的一个参数（sql-column）指向关系中的列，即外键。这里假定外键指向关系的另一侧的主键。</p>
<p>某些供应商特有的映射带有两个参数：外键和外键指向的另一个表（Dept）中的列名称。为了看清楚这一点，我们来显示这些表的实际的 SQL DDL。</p>
<p>
						
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
 CREATE TABLE DEPT (
     DEPTID      INT         IDENTITY    PRIMARY KEY,
     NAME        VARCHAR (80)
 );
 
 
 CREATE TABLE EMPLOYEE (
     EMPID       INT         IDENTITY     PRIMARY KEY,
     FNAME       VARCHAR (80),
     LNAME       VARCHAR (80),
     PHONE       VARCHAR (80),
     DEPTID      INT,
     CONSTRAINT  DEPTFK FOREIGN KEY (DEPTID)
                        REFERENCES DEPT (DEPTID)
 );
     </code>
</pre>
					
</p>
<p>employee 表的外键 <code>DEPTID</code> 引用部门的主键 <code>DEPTID</code>。</p>
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