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| <title>Version mapping</title> |
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| <meta name="doctitle" content="Version mapping" /> |
| <meta name="relnum" content="Release 3.3" /> |
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| <p class="betadraftsubtitle">Beta Draft: 2013-01-03</p> |
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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 > 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"><COLUMN_TABLE></span>", name="<<span class="italic">COLUMN_NAME</span>>") |
| |
| </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> |
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| </ul> |
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