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-<meta name="doctitle" content="Entity" />
-<meta name="relnum" content="Release 2.3" />
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-<p><a id="BABGBIEE" name="BABGBIEE"></a></p>
-<div class="sect2"><!-- infolevel="all" infotype="General" -->
-<p><a id="sthref70" name="sthref70"></a><a id="sthref71" name="sthref71"></a><a id="sthref72" name="sthref72"></a><a id="sthref73" name="sthref73"></a>An <span class="bold">Entity</span> is a persistent domain object.</p>
-<p>An entity <span class="italic">can be</span>:</p>
-<p>Abstract or concrete classes. Entities may also extend non-entity classes as well as entity classes, and non-entity classes may extend entity classes.</p>
-<p>An entity <span class="italic">must have</span>:</p>
-<p>A no-arg constructor (public or protected); the entity class may have other constructors as well.</p>
-<p><a id="sthref74" name="sthref74"></a><a id="sthref75" name="sthref75"></a><a id="sthref76" name="sthref76"></a>Each persistent entity must be mapped to a database table and contain a primary key. Persistent entities are identified by the <code>@Entity</code> annotation.</p>
-<p>Use this procedure to add persistence to an existing entity:</p>
-<p>Open the Java class in the <span class="gui-object-title">Project Explorer.</span></p>
-<p>Select the class in the JPA Structure view.</p>
-<p>In the JPA Details view, click the mapping type hyperlink to access the Mapping Type Selection dialog. In the following figure, clicking <span class="italic">entity</span> invokes the dialog from the JPA Details View.</p>
-<div class="figure"><a id="sthref77" name="sthref77"></a>
-<p class="titleinfigure">The Mapping Type Hyperlink</p>
-<img src="img/mapped_entity_type_link.png" alt="The JPA Details view for an entity showing the mapping type hyperlink." title="The JPA Details view for an entity showing the mapping type hyperlink." /><br /></div>
-<!-- class="figure" -->
-<div align="center">
-<div class="inftblnotealso"><br />
-<table class="NoteAlso oac_no_warn" summary="" cellpadding="3" cellspacing="0">
-<td align="left">
-<p class="notep1">Tip:</p>
-You can also change (or add) persistence for an entity by right-clicking the class in the JPA Structure View and then clicking <span class="bold">Map As &gt; Entity</span>.</td>
-<br /></div>
-<!-- class="inftblnotealso" --></div>
-<p>Select <span class="bold">Entity</span> from the Mapping Type Selection dialog and then click <span class="bold">OK</span>.</p>
-<div class="figure"><a id="sthref78" name="sthref78"></a>
-<p class="titleinfigure">The Mapping Type Selection Dialog</p>
-<img src="img/mapping_type_selection_entity.png" alt="The Mapping Type selection dialog with Enity selected." title="The Mapping Type selection dialog with Enity selected." /><br /></div>
-<!-- class="figure" --></li>
-<p>Complete the remaining <a href="ref_persistence_prop_view.htm#BABFAEBB">JPA Details view (for entities)</a>.</p>
-<img src="img/ngrelt.png" alt="Related tasks" title="Related tasks" /><br />
-<br />
-<a href="task_add_persistence.htm#BABHICAI">Adding persistence to a class</a><br />
-<a href="task_additonal_tables.htm#CIHGBIEI">Specifying additional tables</a><br />
-<a href="task_inheritance.htm#CIHCCCJD">Specifying entity inheritance</a><br /></div>
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