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diff --git a/jpa/plugins/org.eclipse.jpt.doc.user/tasks019.htm b/jpa/plugins/org.eclipse.jpt.doc.user/tasks019.htm index 8efbe14ba7..f9f3209292 100644 --- a/jpa/plugins/org.eclipse.jpt.doc.user/tasks019.htm +++ b/jpa/plugins/org.eclipse.jpt.doc.user/tasks019.htm @@ -6,11 +6,11 @@ <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="Content-Script-Type" content="text/javascript" /> -<title>Generating entities from tables</title> -<meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1 Build 004" /> -<meta name="date" content="2010-01-22T9:29:48Z" /> +<title>Version mapping</title> +<meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1" /> +<meta name="date" content="2010-05-19T8:12:45Z" /> <meta name="robots" content="noarchive" /> -<meta name="doctitle" content="Generating entities from tables" /> +<meta name="doctitle" content="Version mapping" /> <meta name="relnum" content="Release 2.3" /> <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" /> @@ -18,67 +18,108 @@ <!-- contents --> </head> <body> -<p><a id="BABBAGFI" name="BABBAGFI"></a></p> -<div class="sect1"> -<h1>Generating entities from tables</h1> -<p><a id="sthref156" name="sthref156"></a><a id="sthref157" name="sthref157"></a>Use this procedure to generate Java persistent entities from database tables. You must create a JPA project and establish a database connection <span class="italic">before</span> generating persistent entities. See <a href="task_create_new_project.htm#CIHHEJCJ">"Creating a new JPA project"</a> for more information.<a id="sthref158" name="sthref158"></a><a id="sthref159" name="sthref159"></a></p> -<ol> +<p><a id="BABHIBII" name="BABHIBII"></a></p> +<div class="sect2"><!-- infolevel="all" infotype="General" --> +<h1>Version mapping</h1> +<p><a id="sthref154" name="sthref154"></a><a id="sthref155" name="sthref155"></a><a id="sthref156" name="sthref156"></a><a id="sthref157" name="sthref157"></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>Right-click the JPA project in the <span class="gui-object-title">Project Explorer</span> and select <span class="gui-object-action">JPA Tools > Generate Entities from Tables</span>.</p> -<div class="figure"><a id="sthref160" name="sthref160"></a> -<p class="titleinfigure">Generating Entities</p> -<img src="img/generate_entities.png" alt="Using the JPA Tools > Generate Entities menu option." title="Using the JPA Tools > Generate Entities menu option." /><br /></div> -<!-- class="figure" --></li> +<p><code>int</code></p> +</li> <li> -<p>On the <a href="ref_selectTables.htm#CIAHCGEE">Select Tables</a> page, select your database connection and schema.</p> -<p>To create a new database connection, click <span class="bold">Add connection</span>.</p> -<p>If you are not currently connected to the database, the Database Connection page appears. Select your database connection and schema, and click <span class="bold">Reconnect</span>.</p> -<div class="figure"><a id="sthref161" name="sthref161"></a> -<p class="titleinfigure">Select Tables</p> -<img src="img/select_tables.png" alt="" title="" /><br /></div> -<!-- class="figure" --></li> +<p><code>Integer</code></p> +</li> <li> -<p>After selecting a schema, select the tables from which to generate Java persistent entities and click <span class="bold">Next</span>.</p> +<p><code>short, Short</code></p> </li> <li> -<p>On the <a href="ref_tableAssociations.htm#CIACDICB">Table Associations</a> page, select the associations to generate. You can specify to generate specific references for each association.</p> -<p>To create a new association, click <span class="bold">Add Association</span>. Use the <a href="ref_create_new_association_wizard.htm#CIAFGHIF">Create New Association</a> wizard to define the association.</p> -<div class="figure"><a id="sthref162" name="sthref162"></a> -<p class="titleinfigure">Table Associations</p> -<img src="img/table_associations.png" alt="" title="" /><br /></div> -<!-- class="figure" --></li> +<p><code>long, Long</code></p> +</li> <li> -<p>After editing the table associations, click <span class="bold">Next</span>.</p> +<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>On the <a href="ref_customizeDefaultEntityGeneration.htm#CIAEJDBE">Customize Default Entity Generation</a> page, customize the mapping and class information for each generated entity.</p> -<div class="figure"><a id="sthref163" name="sthref163"></a> -<p class="titleinfigure">Customize Default Entity Generation</p> -<img src="img/customize_default_entity_generation.png" alt="" title="" /><br /></div> -<!-- class="figure" --></li> +<p>Date</p> +</li> <li> -<p>After customizing the mappings, click <span class="bold">Next</span>.</p> +<p>Time</p> </li> <li> -<p>On the <a href="ref_customizIndividualEntities.htm#CIACIGEE">Customize Individual Entities</a> page, review the mapping and class information for each entity that will be generated, then click <span class="bold">Finish</span>.</p> -<div class="figure"><a id="sthref164" name="sthref164"></a> -<p class="titleinfigure">Customize Individual Entities</p> -<img src="img/customize_individual_entities.png" alt="" title="" /><br /></div> -<!-- class="figure" --></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 creates a Java persistent entity for each database table. Each entity contains fields based on the table's columns. Eclipse will also generate entity relationships (such as one-to-one) based on the table constraints. <a href="#CIHJIJJC">Figure: Generating Entities from Tables</a> illustrates how Eclipse generates entities from tables.</p> -<div class="figure"><a id="CIHJIJJC" name="CIHJIJJC"></a> -<p class="titleinfigure">Generating Entities from Tables</p> -<img src="img/table_entity.png" alt="This figure shows the EMPLOYEE and ADDRESS entities generated from database tables." title="This figure shows the EMPLOYEE and ADDRESS entities generated from database tables." /><br /></div> -<!-- class="figure" --> +<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 /> -<p><a href="task_create_new_project.htm#CIHHEJCJ">Creating a new JPA project</a></p> +<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_project_properties.htm#BABJHBCI">Project Properties page – Java Persistence Options</a></div> -<!-- class="sect1" --> +<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" --> <!-- Start Footer --> <div class="footer"> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> |