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<title>Version mapping</title>
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<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>Version mapping</h1>
<p><a id="sthref282" name="sthref282"></a><a id="sthref283" name="sthref283"></a><a id="sthref284" name="sthref284"></a><a id="sthref285" name="sthref285"></a>Use a <span class="bold">Version Mapping</span> to specify the field used for optimistic locking. If the entity is associated with multiple tables, you should use a version mapping only with the primary table. You should have only a single version mapping per persistent entity. Version mappings may be used only with the following attribute types:</p>
<ul>
<li>
<p><code>int</code></p>
</li>
<li>
<p><code>Integer</code></p>
</li>
<li>
<p><code>short, Short</code></p>
</li>
<li>
<p><code>long, Long</code></p>
</li>
<li>
<p><code>Timestamp</code></p>
</li>
</ul>
<p>To create a version mapping:</p>
<ol>
<li>
<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map.</p>
</li>
<li>
<p>Right-click the field and then select <span class="bold">Map As &gt; Version</span>. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected.</p>
<div class="figure"><a id="sthref286" name="sthref286"></a>
<p class="titleinfigure">JPA Details, Version Mapping</p>
<img src="img/jpa_details_version.png" alt="JPA Details, Version Mapping" title="JPA Details, Version Mapping" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>Complete each field in the <a href="reference042.htm#CACHAEBB">Version Mapping</a> area.</p>
</li>
<li>
<p>Complete the remaining areas in the <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a>:</p>
<ul>
<li>
<p><a href="reference043.htm#CACIHAAF">Type information</a></p>
</li>
<li>
<p><a href="reference045.htm#CACJCHJB">Converters</a></p>
</li>
</ul>
</li>
</ol>
<p>Eclipse adds the following annotations to the field:</p>
<pre xml:space="preserve" class="oac_no_warn">
@Version
@Column(table="<span class="italic">&lt;COLUMN_TABLE&gt;</span>", name="&lt;<span class="italic">COLUMN_NAME</span>&gt;")

</pre>
<a id="sthref287" name="sthref287"></a>
<p class="subhead2">Related tasks</p>
<ul>
<li>
<p><a href="task_mapping.htm#BABDGBIJ">Mapping an entity</a></p>
</li>
</ul>
<a id="sthref288" name="sthref288"></a>
<p class="subhead2">Related references</p>
<ul>
<li>
<p><a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a></p>
</li>
<li>
<p><a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a></p>
</li>
<li>
<p><a href="reference043.htm#CACIHAAF">Type information</a></p>
</li>
<li>
<p><a href="reference045.htm#CACJCHJB">Converters</a></p>
</li>
</ul>
<a id="sthref289" name="sthref289"></a>
<p class="subhead2">Related concepts</p>
<ul>
<li>
<p><a href="concept_mapping.htm#BABBDJFI">Understanding OR mappings</a></p>
</li>
<li>
<p><a href="concepts001.htm#BABBGFJG">Understanding Java Persistence API</a></p>
</li>
</ul>
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