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<p><a id="BABHIBII" name="BABHIBII"></a></p>
<div class="sect2"><!-- infolevel="all" infotype="General" -->
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<h1>Version mapping</h1>
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<p><a id="sthref150" name="sthref150"></a><a id="sthref151" name="sthref151"></a><a id="sthref152" name="sthref152"></a><a id="sthref153" name="sthref153"></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 type="disc">
<p><code>int</code></p>
</li>
<li type="disc">
<p><code>Integer</code></p>
</li>
<li type="disc">
<p><code>short, Short</code></p>
</li>
<li type="disc">
<p><code>long, Long</code></p>
</li>
<li type="disc">
<p><code>Timestamp</code></p>
</li>
</ul>
<p>To create a version mapping:</p>
<ol type="1" 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.</p>
</li>
<li>
<p>In the <span class="gui-object-title">Map As</span> field, select <span class="gui-object-action">Version</span>.</p>
</li>
<li>
<p>Use this table to complete the remaining fields in the JPA Details 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">
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<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>
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<td align="left" id="r2c1-t16" headers="r1c1-t16">Column</td>
<td align="left" headers="r2c1-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 type="disc">
<p>Name – Name of the database column.</p>
</li>
<li type="disc">
<p>Table – Name of the database table. This must be the primary table associated with the attribute's entity.</p>
</li>
<li type="disc">
<p>Insertable – Specify if the column is always included in <code>SQL INSERT</code> statements.</p>
</li>
<li type="disc">
<p>Updatable – Specify if the column is always included in <code>SQL UPDATE</code> statements.</p>
</li>
</ul>
</td>
<td align="left" headers="r2c1-t16 r1c3-t16">By default, the Column is assumed to be named identically to the attribute and always included in the <code>INSERT</code> and <code>UPDATE</code> statements.</td>
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<br /></div>
<!-- class="inftblruleinformal" --></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"><COLUMN_TABLE></span>", name="<<span class="italic">COLUMN_NAME</span>>", insertable=false,
updatable=false)
</pre>
<p> </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> </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> </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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