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| <title>Version mapping</title> |
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| <meta name="doctitle" content="Version mapping" /> |
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| <div class="sect2"><!-- infolevel="all" infotype="General" --> |
| <h1>Version mapping</h1> |
| <p><a id="sthref152" name="sthref152"></a><a id="sthref153" name="sthref153"></a><a id="sthref154" name="sthref154"></a><a id="sthref155" name="sthref155"></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> |
| </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"> |
| <col width="19%" /> |
| <col width="*" /> |
| <col width="38%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t27">Property</th> |
| <th align="left" valign="bottom" id="r1c2-t27">Description</th> |
| <th align="left" valign="bottom" id="r1c3-t27">Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t27" headers="r1c1-t27">Mapped Entity Hyperlink</td> |
| <td align="left" headers="r2c1-t27 r1c2-t27">Defines the mapping as Version. This corresponds to the <code>@Version</code> annotation.</td> |
| <td align="left" headers="r2c1-t27 r1c3-t27">Version</td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t27" headers="r1c1-t27">Column</td> |
| <td align="left" headers="r3c1-t27 r1c2-t27">The database column mapped to the entity attribute. See <a href="ref_mapping_general.htm#CACGCBHB">"Column"</a> for details.</td> |
| <td align="left" headers="r3c1-t27 r1c3-t27">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> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t27" headers="r1c1-t27">Table</td> |
| <td align="left" headers="r4c1-t27 r1c2-t27">Name of the database table. This must be the primary table associated with the attribute's entity.</td> |
| <td align="left" headers="r4c1-t27 r1c3-t27"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t27" headers="r1c1-t27">Temporal</td> |
| <td align="left" headers="r5c1-t27 r1c2-t27">Specifies the type of data. See <a href="ref_mapping_general.htm#CACEAJGD">"Temporal"</a> for details. |
| <ul> |
| <li> |
| <p>Date</p> |
| </li> |
| <li> |
| <p>Time</p> |
| </li> |
| <li> |
| <p>Timestamp</p> |
| </li> |
| </ul> |
| </td> |
| <td align="left" headers="r5c1-t27 r1c3-t27"><br /></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"> |
| @Version |
| @Column(table="<span class="italic"><COLUMN_TABLE></span>", name="<<span class="italic">COLUMN_NAME</span>>") |
| |
| </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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