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| <p><a id="CIHDIAEE" name="CIHDIAEE"></a></p> |
| <div class="sect2"><!-- infolevel="all" infotype="General" --> |
| <h1>Embedded ID mapping</h1> |
| <p><a id="sthref122" name="sthref122"></a><a id="sthref123" name="sthref123"></a><a id="sthref124" name="sthref124"></a><a id="sthref125" name="sthref125"></a>Use an <span class="bold">Embedded ID Mapping</span> to specify the primary key of an embedded ID. These mappings may be used with a <a href="tasks005.htm#BABFEICE">Embeddable</a> entities.</p> |
| <ol start="1"> |
| <li> |
| <p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected field.</p> |
| </li> |
| <li> |
| <p>In the <span class="gui-object-title">Map As</span> field, select <span class="gui-object-action">Embedded Id</span>.</p> |
| </li> |
| <li> |
| <p>Use this table to complete the remaining fields on the <span class="gui-object-title">JPA Details</span> 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"> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t6">Property</th> |
| <th align="left" valign="bottom" id="r1c2-t6">Description</th> |
| <th align="left" valign="bottom" id="r1c3-t6">Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t6" headers="r1c1-t6">Map As</td> |
| <td align="left" headers="r2c1-t6 r1c2-t6">Defines this mapping as a <span class="bold">Embedded Id</span>. |
| <p>This field corresponds to the <code>@EmbeddedId</code> annotation.</p> |
| </td> |
| <td align="left" headers="r2c1-t6 r1c3-t6">Embedded Id</td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="inftblruleinformal" --></li> |
| </ol> |
| <p>Eclipse adds the following annotations to the field:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @EmbeddedId |
| </pre> |
| <p> </p> |
| <img src="img/ngrelt.png" alt="Related task" title="Related task" /><br /> |
| <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_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> |
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