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| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@JoinField</font></h2> |
| <p>Use <code>@JoinField</code> to define a structured data type's foreign key field for an object mapped to NoSql data.</p> |
| <a id="sthref171" name="sthref171"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#CIHEHJJH">Table 2-29</a> describes this annotation's elements.</p> |
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| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-29 @JoinField Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@JoinField Annotation Elements" summary="This table describes this annotation’s elements." dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
| <col width="23%" /> |
| <col width="*" /> |
| <col width="20%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t38"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t38"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t38"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
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| <td align="left" id="r2c1-t38" headers="r1c1-t38"> |
| <p><code>name</code></p> |
| </td> |
| <td align="left" headers="r2c1-t38 r1c2-t38"> |
| <p>(Optional) The name of the foreign key/ID reference field in the source record.</p> |
| </td> |
| <td align="left" headers="r2c1-t38 r1c3-t38"><br /></td> |
| </tr> |
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| <td align="left" id="r3c1-t38" headers="r1c1-t38"> |
| <p><code>referencedFieldName</code></p> |
| </td> |
| <td align="left" headers="r3c1-t38 r1c2-t38"> |
| <p>(Optional) The name of the ID field in the target record.</p> |
| </td> |
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| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>The <code>@JoinField</code> annotation is a generic form of the <code>@JoinColumn</code> annotation, which is not specific to relational databases. You can use <code>@JoinField</code> to map EIS and NoSQL data.</p> |
| <a id="sthref174" name="sthref174"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p>These examples show how to use this extension as an annotation and in XML.</p> |
| <div class="example"><a id="CIHCFEJH" name="CIHCFEJH"></a><a id="TLJPA54006" name="TLJPA54006"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-54 Using @JoinField Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Entity |
| @NoSql |
| public class Order { |
| ... |
| @ManyToOne |
| @JoinField(name="customerId") |
| private Customer customer; |
| } |
| </pre></div> |
| <!-- class="example" --> |
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| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-55 Using <join-field> in XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <entity name="Order" class="org.acme.Order"> |
| <no-sql/> |
| ... |
| <many-to-one name="customer"> |
| <join-field name="customerId"/> |
| </many-to-one> |
| </entity> |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref176" name="sthref176"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p>"Mappings"<br /> |
| <code><a href="http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/NoSQL/Mappings">http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/NoSQL/Mappings</a></code></p> |
| </li> |
| <li> |
| <p><a href="a_joinfields.htm#BEIFHJJE">"@JoinFields"</a></p> |
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