| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" |
| "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
| <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
| <head> |
| <!-- Run date = May 21, 2008 14:42:06 --> |
| <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> |
| <title>Version mapping</title> |
| |
| <meta http-equiv="Content-Style-Type" content="text/css" /> |
| <meta http-equiv="Content-Script-Type" content="text/javascript" /> |
| <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.0" /> |
| <meta name="date" content="2005-07-10T12:57:20+08:00" /> |
| <meta name="robots" content="noarchive" /> |
| <meta name="doctitle" content="Version mapping" /> |
| <meta name="relnum" content="Release 2.0" /> |
| <meta name="copyright" content="Copyright (c) 2000, 2008 oracle . All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html. Contributors: Oracle - initial API and implementation" /> |
| <link rel="copyright" href="dcommon/html/cpyr.htm" title="Copyright" type="text/html" /> |
| <link rel="stylesheet" href="dcommon/css/blafdoc.css" title="Oracle BLAFDoc" type="text/css" /> |
| <link rel="start" href="../../index.htm" title="Home" type="text/html" /> |
| <link rel="contents" href="toc.htm" title="Contents" type="text/html" /> |
| </head> |
| <body> |
| <p><a id="BABHIBII" name="BABHIBII"></a></p> |
| <div class="sect2"><!-- infolevel="all" infotype="General" --> |
| <h1>Version mapping</h1> |
| <p><a id="sthref135" name="sthref135"></a><a id="sthref136" name="sthref136"></a><a id="sthref137" name="sthref137"></a><a id="sthref138" name="sthref138"></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 start="1"> |
| <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"> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t28">Property</th> |
| <th align="left" valign="bottom" id="r1c2-t28">Description</th> |
| <th align="left" valign="bottom" id="r1c3-t28">Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t28" headers="r1c1-t28">Mapped Entity Hyperlink</td> |
| <td align="left" headers="r2c1-t28 r1c2-t28">Defines the mapping as Version. This corresponds to the <code>@Version</code> annotation.</td> |
| <td align="left" headers="r2c1-t28 r1c3-t28">Version</td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t28" headers="r1c1-t28">Column</td> |
| <td align="left" headers="r3c1-t28 r1c2-t28">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-t28 r1c3-t28">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-t28" headers="r1c1-t28">Table</td> |
| <td align="left" headers="r4c1-t28 r1c2-t28">Name of the database table. This must be the primary table associated with the attribute's entity.</td> |
| <td align="left" headers="r4c1-t28 r1c3-t28"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t28" headers="r1c1-t28">Temporal</td> |
| <td align="left" headers="r5c1-t28 r1c2-t28">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-t28 r1c3-t28"><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> |
| <!-- class="sect2" --> |
| <!-- class="sect1" --> |
| <!-- Start Footer --> |
| <div class="footer"> |
| <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> |
| <tr> |
| <td align="left" width="86%"><a href="dcommon/html/cpyr.htm"><span class="copyrightlogo">Copyright © 2006, 2008, Oracle. All rights reserved.</span></a></td> |
| </tr> |
| </table> |
| </div> |
| <!-- class="footer" --> |
| </body> |
| </html> |
