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<title>Embedded ID mapping</title>
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<p><a id="CIHDIAEE" name="CIHDIAEE"></a></p>
<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>Embedded ID mapping</h1>
<p><a id="sthref122" name="sthref122"></a><a id="sthref123" name="sthref123"></a><a id="sthref124" name="sthref124"></a><a id="sthref125" name="sthref125"></a>Use an <span class="bold">Embedded ID Mapping</span> to specify the primary key of an embedded ID. These mappings may be used with a <a href="tasks005.htm#BABFEICE">Embeddable</a> entities.</p>
<ol start="1">
<li>
<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected field.</p>
</li>
<li>
<p>In the <span class="gui-object-title">Map As</span> field, select <span class="gui-object-action">Embedded Id</span>.</p>
</li>
<li>
<p>Use this table to complete the remaining fields on the <span class="gui-object-title">JPA Details</span> view.</p>
<div class="inftblruleinformal">
<table class="RuleInformal" title="This table lists the fields in the Persistence Properties view for this mapping." summary="This table lists the fields in the Persistence Properties view for this mapping." dir="ltr" border="1" width="100%" frame="border" rules="all" cellpadding="3" cellspacing="0">
<thead>
<tr align="left" valign="top">
<th align="left" valign="bottom" id="r1c1-t6">Property</th>
<th align="left" valign="bottom" id="r1c2-t6">Description</th>
<th align="left" valign="bottom" id="r1c3-t6">Default</th>
</tr>
</thead>
<tbody>
<tr align="left" valign="top">
<td align="left" id="r2c1-t6" headers="r1c1-t6">Map As</td>
<td align="left" headers="r2c1-t6 r1c2-t6">Defines this mapping as a <span class="bold">Embedded Id</span>.
<p>This field corresponds to the <code>@EmbeddedId</code> annotation.</p>
</td>
<td align="left" headers="r2c1-t6 r1c3-t6">Embedded Id</td>
</tr>
</tbody>
</table>
<br /></div>
<!-- class="inftblruleinformal" --></li>
</ol>
<p>Eclipse adds the following annotations to the field:</p>
<pre xml:space="preserve" class="oac_no_warn">
@EmbeddedId
</pre>
<p> </p>
<img src="img/ngrelt.png" alt="Related task" title="Related task" /><br />
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<a href="task_mapping.htm#BABDGBIJ">Mapping an entity</a>
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<a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a><br />
<a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a>
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<img src="img/ngrelc.png" alt="Related concept" title="Related concept" /><br />
<br />
<a href="concept_mapping.htm#BABBDJFI">Understanding OR mappings</a><br />
<a href="concepts001.htm#BABBGFJG">Understanding EJB 3.0 Java Persistence API</a></div>
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