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<title>Embedded mapping</title>
 
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<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>Embedded mapping</h1>
<p><a id="sthref101" name="sthref101"></a><a id="sthref102" name="sthref102"></a><a id="sthref103" name="sthref103"></a><a id="sthref104" name="sthref104"></a>Use an <span class="bold">Embedded Mapping</span> to specify a persistent field or property of an entity whose value is an instance of an embeddable class.</p>
<ol start="1">
<li>
<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, right-click the field to map.</p>
</li>
<li>
<p>Select <span class="bold">Map as &gt; Embedded</span>. 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>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-t16">Property</th>
<th align="left" valign="bottom" id="r1c2-t16">Description</th>
<th align="left" valign="bottom" id="r1c3-t16">Default</th>
</tr>
</thead>
<tbody>
<tr align="left" valign="top">
<td align="left" id="r2c1-t16" headers="r1c1-t16">Entity Mapping Hyperlnk</td>
<td align="left" headers="r2c1-t16 r1c2-t16">Defines this mapping as a <span class="bold">Embedded</span>.
<p>This corresponds to the <code>@Embedded</code> annotation.</p>
</td>
<td align="left" headers="r2c1-t16 r1c3-t16">Embedded</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r3c1-t16" headers="r1c1-t16">Attribute Overrides</td>
<td align="left" headers="r3c1-t16 r1c2-t16">Specify to override the default mapping of an entity's attribute. Select <span class="bold">Override Default</span>.</td>
<td align="left" headers="r3c1-t16 r1c3-t16"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r4c1-t16" headers="r1c1-t16">Columns</td>
<td align="left" headers="r4c1-t16 r1c2-t16">The database column (and its table) mapped to the entity attribute. See <a href="ref_mapping_general.htm#CACGCBHB">"Column"</a> for details.
<ul>
<li>
<p>Name &ndash; Name of the database column.</p>
</li>
<li>
<p>Table &ndash; Name of the database table.</p>
</li>
</ul>
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<td align="left" headers="r4c1-t16 r1c3-t16"><br /></td>
</tr>
</tbody>
</table>
<br /></div>
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</ol>
<p>Eclipse adds the following annotations to the field:</p>
<pre xml:space="preserve" class="oac_no_warn">
@Embedded
@AttributeOverride(column=@Column(table="<span class="italic">&lt;COLUMN_TABLE&gt;</span>", name = "<span class="italic">&lt;COLUMN_NAME&gt;</span>"))
</pre>
<p>&nbsp;</p>
<img src="img/ngrelt.png" alt="Related task" title="Related task" /><br />
<br />
<a href="task_mapping.htm#BABDGBIJ">Mapping an entity</a>
<p>&nbsp;</p>
<img src="img/ngrelr.png" alt="Related reference" title="Related reference" /><br />
<br />
<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>
<p>&nbsp;</p>
<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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