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-<title>Specifying entity inheritance</title>
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-<div class="sect1"><!-- infolevel="all" infotype="General" -->
-<table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%">
-<tr valign="bottom">
-<td align="left" width="86%">
-<h1>Specifying entity inheritance</h1>
-</td>
-</tr>
-</table>
-<p><a id="sthref100" name="sthref100"></a><a id="sthref101" name="sthref101"></a>An entity may inherit properties from other entities. You can specify a specific strategy to use for inheritance.</p>
-<p>Use this procedure to specify inheritance (<code>@Inheritance)</code> for an existing entity (<code>@Entity</code>):</p>
-<ol type="1" start="1">
-<li>
-<p>Select the entity in the <span class="gui-object-title">Package Explorer</span>.</p>
-</li>
-<li>
-<p>In the <span class="gui-object-title">JPA Details</span> view, select the <span class="gui-object-action">Inheritance</span> information.</p>
-<div class="figure"><a id="sthref102" name="sthref102"></a>
-<p class="titleinfigure">Specifying Inheritance</p>
-<img src="img/inheritance_tab.png" alt="Selecting the Inheritance area on the JPA Details view." title="Selecting the Inheritance area on the JPA Details view." /><br /></div>
-<!-- class="figure" --></li>
-<li>
-<p>In the <span class="bold">Strategy</span> list, select one of the following the inheritance strategies:</p>
-<ul>
-<li type="disc">
-<p>A single table (default)</p>
-</li>
-<li type="disc">
-<p>Joined table</p>
-</li>
-<li type="disc">
-<p>One table per class</p>
-</li>
-</ul>
-</li>
-<li>
-<p>Use the following table to complete the remaining fields on the tab. See <a href="reference005.htm#CACFHGHE">"Inheritance information"</a> for additional details.</p>
-<div class="inftblruleinformal">
-<table class="RuleInformal" title="This table describes the options on the Persistence Properties view, Inheritance tab." summary="This table describes the options on the Persistence Properties view, Inheritance tab." 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-t3">Property</th>
-<th align="left" valign="bottom" id="r1c2-t3">Description</th>
-<th align="left" valign="bottom" id="r1c3-t3">Default</th>
-</tr>
-</thead>
-<tbody>
-<tr align="left" valign="top">
-<td align="left" id="r2c1-t3" headers="r1c1-t3"><a id="sthref103" name="sthref103"></a><a id="sthref104" name="sthref104"></a>Discriminator Column</td>
-<td align="left" headers="r2c1-t3 r1c2-t3">Name of the discriminator column when using a <span class="bold">Single</span> or <span class="bold">Joined</span> inheritance strategy.
-<p>This field corresponds to the <code>@DiscriminatorColumn</code> annotation.</p>
-</td>
-<td align="left" headers="r2c1-t3 r1c3-t3"><br /></td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r3c1-t3" headers="r1c1-t3">Discriminator Type</td>
-<td align="left" headers="r3c1-t3 r1c2-t3">Set the discriminator type to <code>Char</code> or <code>Integer</code> (instead of its default: <code>String</code>). The <span class="bold">Discriminator Value</span> must conform to this type.</td>
-<td align="left" headers="r3c1-t3 r1c3-t3">String</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r4c1-t3" headers="r1c1-t3"><a id="sthref105" name="sthref105"></a><a id="sthref106" name="sthref106"></a>Discriminator Value</td>
-<td align="left" headers="r4c1-t3 r1c2-t3">Specify the discriminator value used to differentiate an entity in this inheritance hierarchy. The value must conform to the specified <span class="bold">Discriminator Type</span>.
-<p>This field corresponds to the <code>@DiscriminatorValue</code> annotation.</p>
-</td>
-<td align="left" headers="r4c1-t3 r1c3-t3"><br /></td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r5c1-t3" headers="r1c1-t3">Override Default</td>
-<td align="left" headers="r5c1-t3 r1c2-t3">Use this field to specify custom primary key join columns.
-<p>This field corresponds to the <code>@PrimaryKeyJoinClumn</code> annotation.</p>
-</td>
-<td align="left" headers="r5c1-t3 r1c3-t3"><br /></td>
-</tr>
-</tbody>
-</table>
-<br /></div>
-<!-- class="inftblruleinformal" --></li>
-</ol>
-<p>Eclipse adds the following annotations the entity field:</p>
-<pre xml:space="preserve" class="oac_no_warn">
-@Inheritance(strategy=InheritanceType.<span class="italic">&lt;INHERITANCE_STRATEGY&gt;</span>)
-@DiscriminatorColumn(name="<span class="italic">&lt;DISCRIMINATOR_COLUMN&gt;</span>",
- discriminatorType=<span class="italic">&lt;DISCRIMINATOR_TYPE&gt;</span>)
-@DiscriminatorValue(value-"<span class="italic">&lt;DISCRIMINATOR_VALUE&gt;</span>")
-@PrimaryKeyJoinColumn(name="<span class="italic">&lt;JOIN_COLUMN_NAME&gt;</span>",
- referencedColumnName = "<span class="italic">&lt;REFERENCED_COLUMN_NAME&gt;</span>")
-
-
-</pre>
-<p><a id="sthref107" name="sthref107"></a><a id="sthref108" name="sthref108"></a><a id="sthref109" name="sthref109"></a>The following figures illustrates the different inheritance strategies.</p>
-<div class="figure"><a id="sthref110" name="sthref110"></a>
-<p class="titleinfigure">Single Table Inheritance</p>
-<img src="img/inheritance_single.png" alt="This figure illustrates entity inheritance in a single table." title="This figure illustrates entity inheritance in a single table." /><br /></div>
-<!-- class="figure" -->
-<div class="figure"><a id="sthref111" name="sthref111"></a>
-<p class="titleinfigure"><a id="sthref112" name="sthref112"></a><a id="sthref113" name="sthref113"></a>Joined Table Inheritance</p>
-<img src="img/inheritance_join.png" alt="This figure shows a sample joined inheritance table strategy." title="This figure shows a sample joined inheritance table strategy." /><br /></div>
-<!-- class="figure" -->
-<p>&nbsp;</p>
-<img src="img/ngrelr.png" alt="Related reference" title="Related reference" /><br />
-<br />
-<p>&nbsp;</p>
-<img src="img/ngrelt.png" alt="Related task" title="Related task" /><br />
-<br />
-<a href="task_add_persistence.htm#BABHICAI">Adding persistence to a class</a>
-<p>&nbsp;</p>
-<img src="img/ngrelc.png" alt="Related concept" title="Related concept" /><br />
-<br />
-<a href="concept_persistence.htm#BABCAHIC">Understanding Java persistence</a><br /></div>
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