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| <title>Inheritance</title> |
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| <meta name="doctitle" content="Inheritance" /> |
| <meta name="relnum" content="Release 3.3" /> |
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| <div class="sect3"><!-- infolevel="all" infotype="General" --> |
| <h1>Inheritance</h1> |
| <p><a id="sthref487" name="sthref487"></a><a id="sthref488" name="sthref488"></a>This table lists the fields available on the <span class="gui-object-title">Inheritance</span> area in the <span class="gui-object-title">JPA Details</span> view for each entity type.</p> |
| <div class="inftblhruleinformal"> |
| <table class="HRuleInformal" 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="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
| <col width="16%" /> |
| <col width="*" /> |
| <col width="15%" /> |
| <col width="20%" /> |
| <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> |
| <th align="left" valign="bottom" id="r1c4-t28">Available for Entity Type</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t28" headers="r1c1-t28"> |
| <p>Strategy</p> |
| </td> |
| <td align="left" headers="r2c1-t28 r1c2-t28"> |
| <p>Specify the strategy to use when mapping a class or class hierarchy:</p> |
| <ul> |
| <li> |
| <p><span class="bold">Single table</span> – All classes in the hierarchy are mapped to a single table.</p> |
| </li> |
| <li> |
| <p><span class="bold">Joined</span> – The root of the hierarchy is mapped to a single table; each child maps to its own table.</p> |
| </li> |
| <li> |
| <p><span class="bold">Table per class</span> – Each class is mapped to a separate table.</p> |
| </li> |
| </ul> |
| <p>This field corresponds to the <code>@Inheritance</code> annotation.</p> |
| </td> |
| <td align="left" headers="r2c1-t28 r1c3-t28"> |
| <p>Single table</p> |
| </td> |
| <td align="left" headers="r2c1-t28 r1c4-t28"> |
| <p><a href="tasks004.htm#BABGBIEE">Entity</a></p> |
| <br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t28" headers="r1c1-t28"> |
| <p><a id="sthref489" name="sthref489"></a><a id="sthref490" name="sthref490"></a>Discriminator Value</p> |
| </td> |
| <td align="left" headers="r3c1-t28 r1c2-t28"> |
| <p>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> |
| </td> |
| <td align="left" headers="r3c1-t28 r1c3-t28"><br /></td> |
| <td align="left" headers="r3c1-t28 r1c4-t28"> |
| <p><a href="tasks004.htm#BABGBIEE">Entity</a></p> |
| <br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t28" headers="r1c1-t28"> |
| <p><a id="sthref491" name="sthref491"></a><a id="sthref492" name="sthref492"></a><span class="bold">Discriminator Column</span></p> |
| </td> |
| <td align="left" headers="r4c1-t28 r1c2-t28"> |
| <p>These fields are available when using a <span class="bold">Single</span> or <span class="bold">Joined</span> inheritance strategy.</p> |
| <p>This field corresponds to the <code>@DiscriminatorColumn</code> annotation.</p> |
| <p>Use the <span class="bold">Details</span> area to define the <span class="bold">Length</span> and <span class="bold">Column definition</span> of this Discriminator Column.</p> |
| </td> |
| <td align="left" headers="r4c1-t28 r1c3-t28"><br /></td> |
| <td align="left" headers="r4c1-t28 r1c4-t28"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t28" headers="r1c1-t28"> |
| <p>Name</p> |
| </td> |
| <td align="left" headers="r5c1-t28 r1c2-t28"> |
| <p>Name of the discriminator column</p> |
| </td> |
| <td align="left" headers="r5c1-t28 r1c3-t28"><br /></td> |
| <td align="left" headers="r5c1-t28 r1c4-t28"> |
| <p><a href="tasks004.htm#BABGBIEE">Entity</a></p> |
| <br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r6c1-t28" headers="r1c1-t28"> |
| <p>Type</p> |
| </td> |
| <td align="left" headers="r6c1-t28 r1c2-t28"> |
| <p>Set this field to 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.</p> |
| </td> |
| <td align="left" headers="r6c1-t28 r1c3-t28"> |
| <p>String</p> |
| </td> |
| <td align="left" headers="r6c1-t28 r1c4-t28"> |
| <p><a href="tasks004.htm#BABGBIEE">Entity</a></p> |
| <br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r7c1-t28" headers="r1c1-t28"> |
| <p>Length</p> |
| </td> |
| <td align="left" headers="r7c1-t28 r1c2-t28"> |
| <p>The column length for String-based discriminator types.</p> |
| </td> |
| <td align="left" headers="r7c1-t28 r1c3-t28"> |
| <p>0</p> |
| </td> |
| <td align="left" headers="r7c1-t28 r1c4-t28"> |
| <p><a href="tasks004.htm#BABGBIEE">Entity</a></p> |
| <br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r8c1-t28" headers="r1c1-t28"> |
| <p>Column definition</p> |
| </td> |
| <td align="left" headers="r8c1-t28 r1c2-t28"> |
| <p>The SQL fragment that is used when generating the DDL for the discriminator column.</p> |
| </td> |
| <td align="left" headers="r8c1-t28 r1c3-t28"><br /></td> |
| <td align="left" headers="r8c1-t28 r1c4-t28"> |
| <p><a href="tasks004.htm#BABGBIEE">Entity</a></p> |
| <br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r9c1-t28" headers="r1c1-t28"> |
| <p><span class="bold">Primary Key Join Columns</span></p> |
| </td> |
| <td align="left" headers="r9c1-t28 r1c2-t28"> |
| <p>Use to override the default primary key join columns. Select <span class="bold">Override Default</span>, then click <span class="bold">Add</span> to select new Join Column with the <a href="reference077.htm#CACDGGDB">Add Primary Key Join Column dialog</a>.</p> |
| <p>This field corresponds with @<code>PrimaryKeyJoinColum</code>n annotation.</p> |
| </td> |
| <td align="left" headers="r9c1-t28 r1c3-t28"><br /></td> |
| <td align="left" headers="r9c1-t28 r1c4-t28"> |
| <p><a href="tasks004.htm#BABGBIEE">Entity</a></p> |
| <br /></td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="inftblhruleinformal" --> |
| <p>Refer to <a href="task_inheritance.htm#CIHCCCJD">"Specifying entity inheritance"</a> for additional information.</p> |
| <a id="sthref493" name="sthref493"></a> |
| <p class="subhead2">Related tasks</p> |
| <ul> |
| <li> |
| <p><a href="task_inheritance.htm#CIHCCCJD">Specifying entity inheritance</a></p> |
| </li> |
| <li> |
| <p><a href="task_add_persistence.htm#BABHICAI">Adding persistence to a class</a></p> |
| </li> |
| </ul> |
| <a id="sthref494" name="sthref494"></a> |
| <p class="subhead2">Related reference</p> |
| <ul> |
| <li> |
| <p><a href="ref_persistence_prop_view.htm#BABFAEBB">JPA Details view (for entities)</a></p> |
| </li> |
| <li> |
| <p><a href="reference077.htm#CACDGGDB">Add Primary Key Join Column dialog</a></p> |
| </li> |
| </ul> |
| </div> |
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