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<title>Generating dynamic entities from tables</title>
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<meta name="doctitle" content="Generating dynamic entities from tables" />
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<p class="betadraftsubtitle">Beta Draft: 2013-01-03</p>
<p><a id="CIHHFGIG" name="CIHHFGIG"></a></p>
<div class="sect1"><!-- infolevel="all" infotype="General" -->
<h1>Generating dynamic entities from tables</h1>
<p><a id="sthref307" name="sthref307"></a><a id="sthref308" name="sthref308"></a><a id="sthref309" name="sthref309"></a><a id="sthref310" name="sthref310"></a>When using EclipseLink JPA, you can create dynamic entities from your database tables. This dynamic persistence provides access to a relational database with all the benefits of JPA <span class="italic">without coding</span> or maintaining Java classes.</p>
<p>Dali dynamically creates the classes at runtime, as needed.</p>
<p>To generate dynamic entities:</p>
<ol>
<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 &gt; Generate Dynamic Entities from Tables</span>.</p>
<img src="img/generate_dynamic_entities.png" alt="JPA Tools &gt; Generate Dynamic Entities from Tables" title="JPA Tools &gt; Generate Dynamic Entities from Tables" /><br />
<p>The Select Tables page of the <a href="reference002.htm#CACGDFDJ">Generate Dynamic Entities from Tables wizard</a> appears.</p>
<div class="figure"><a id="sthref311" name="sthref311"></a>
<p class="titleinfigure">Select Tables</p>
<img src="img/select_tables_dynamic.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>On the <a href="reference003.htm#CACFGHJF">Select Tables</a> page, select the tables from which to generate the entities and click <span class="bold">Next</span>.</p>
<p>The <a href="reference004.htm#CACBDJAC">Table Associations</a> page appears.</p>
<div class="figure"><a id="sthref312" name="sthref312"></a>
<p class="titleinfigure">Table Associations</p>
<img src="img/table_associations_dynamic.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>On the <a href="reference004.htm#CACBDJAC">Table Associations</a> page, specify which table associations should be generated. Use the <a href="ref_create_new_association_wizard.htm#CIAFGHIF">Create New Association wizard</a> to create additional relationships.</p>
<p>Click <span class="bold">Next</span>. The <a href="reference005.htm#CACHHEEH">Customize Default Entity Generation</a> page appears.</p>
<div class="figure"><a id="sthref313" name="sthref313"></a>
<p class="titleinfigure">Customize Defaults</p>
<img src="img/customize_default_entity_generation_dynamic.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>On the <a href="reference005.htm#CACHHEEH">Customize Default Entity Generation</a> page, specify the default information to use when generating the entities, and click <span class="bold">Next</span>.</p>
<p>The <a href="reference006.htm#CACDGDIC">Customize Individual Entities</a> page appears.</p>
<div class="figure"><a id="sthref314" name="sthref314"></a>
<p class="titleinfigure">Customize Individual Entities</p>
<img src="img/customize_individual_entities_dynamic.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>Use the <a href="reference006.htm#CACDGDIC">Customize Individual Entities</a> page to customize specific generated entities.</p>
</li>
<li>
<p>Click <span class="bold">Finish</span> to complete the wizard and generate the entities.</p>
</li>
</ol>
<p>Dali generates the dynamic entities, using the <code>VIRTUAL</code> access type, as shown in <a href="#CIHIDHAB">Example: Sample eclipselink-orm.xml File with Dynamic Entities</a>.</p>
<div class="example"><a id="CIHIDHAB" name="CIHIDHAB"></a>
<p class="titleinexample"><a id="sthref315" name="sthref315"></a>Sample eclipselink-orm.xml File with Dynamic Entities</p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;entity-mappings version="2.4" xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.eclipse.org/eclipselink/xsds/persistence/orm http://www.eclipse.org/eclipselink/xsds/eclipselink_orm_2_4.xsd"&gt;
    &lt;entity class="quickstart.demo.model.Inventory" <span class="bold">access="VIRTUAL"</span>&gt;
        &lt;attributes&gt;
            &lt;id name="itemSku" attribute-type="long"&gt;

            &lt;/id&gt;
        &lt;/attributes&gt;
    &lt;/entity&gt;
    &lt;entity ..."&gt;
    &lt;/entity&gt;
&lt;/entity-mappings&gt;
</pre></div>
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