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| <meta name="doctitle" content="Element Collection Mapping" /> |
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| <div class="sect3"><!-- infolevel="all" infotype="General" --> |
| <h1><a id="sthref548" name="sthref548"></a><a id="sthref549" name="sthref549"></a>Element Collection Mapping</h1> |
| <div class="inftblhruleinformal"> |
| <table class="HRuleInformal" summary="JPA Details view, Version page" dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
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| <col width="*" /> |
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| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t35">Property</th> |
| <th align="left" valign="bottom" id="r1c2-t35">Description</th> |
| <th align="left" valign="bottom" id="r1c3-t35">Default</th> |
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| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t35" headers="r1c1-t35"> |
| <p>Target class</p> |
| </td> |
| <td align="left" headers="r2c1-t35 r1c2-t35"> |
| <p>The class (basic or embeddable) that is the element type of the collection.</p> |
| </td> |
| <td align="left" headers="r2c1-t35 r1c3-t35"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t35" headers="r1c1-t35"> |
| <p>Fetch</p> |
| </td> |
| <td align="left" headers="r3c1-t35 r1c2-t35"> |
| <p>Defines how data is loaded from the database:</p> |
| <ul> |
| <li> |
| <p>Eager – Data is loaded in before it is actually needed.</p> |
| </li> |
| <li> |
| <p>Lazy – Data is loaded only when required by the transaction.</p> |
| </li> |
| </ul> |
| </td> |
| <td align="left" headers="r3c1-t35 r1c3-t35"> |
| <p>Lazy</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t35" headers="r1c1-t35"> |
| <p>Join fetch</p> |
| </td> |
| <td align="left" headers="r4c1-t35 r1c2-t35"> |
| <p>The type of fetch to use:</p> |
| <ul> |
| <li> |
| <p>Inner – Provides the inner join fetching of the related object.</p> |
| <p><span class="bold">Note</span>: Inner joining does not allow for null or empty values</p> |
| </li> |
| <li> |
| <p>Outer – Provides the outer join fetching of the related object</p> |
| <p><span class="bold">Note</span>: Outer joining allows for null or empty values.</p> |
| </li> |
| </ul> |
| </td> |
| <td align="left" headers="r4c1-t35 r1c3-t35"> |
| <p>None</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t35" headers="r1c1-t35"> |
| <p><span class="bold">Collection Table</span></p> |
| </td> |
| <td align="left" headers="r5c1-t35 r1c2-t35"><br /></td> |
| <td align="left" headers="r5c1-t35 r1c3-t35"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r6c1-t35" headers="r1c1-t35"> |
| <p>Name</p> |
| </td> |
| <td align="left" headers="r6c1-t35 r1c2-t35"> |
| <p>Name of the database table used for the mapping.</p> |
| </td> |
| <td align="left" headers="r6c1-t35 r1c3-t35"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r7c1-t35" headers="r1c1-t35"> |
| <p>Schema</p> |
| </td> |
| <td align="left" headers="r7c1-t35 r1c2-t35"> |
| <p>Database schema of the <span class="bold">Collection Table</span>.</p> |
| </td> |
| <td align="left" headers="r7c1-t35 r1c3-t35"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r8c1-t35" headers="r1c1-t35"> |
| <p>Catalog</p> |
| </td> |
| <td align="left" headers="r8c1-t35 r1c2-t35"> |
| <p>Database Catalog of the <span class="bold">Collection Table</span>.</p> |
| </td> |
| <td align="left" headers="r8c1-t35 r1c3-t35"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r9c1-t35" headers="r1c1-t35"> |
| <p><span class="bold">Join Columns</span></p> |
| </td> |
| <td align="left" headers="r9c1-t35 r1c2-t35"><br /></td> |
| <td align="left" headers="r9c1-t35 r1c3-t35"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r10c1-t35" headers="r1c1-t35"> |
| <p>Override default</p> |
| </td> |
| <td align="left" headers="r10c1-t35 r1c2-t35"> |
| <p>Click <span class="bold">Add</span> to create a new join column, by using the <a href="reference072.htm#CACJJBAD">Add Join Column dialog</a>.</p> |
| </td> |
| <td align="left" headers="r10c1-t35 r1c3-t35"> |
| <p>0</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="inftblhruleinformal" --> |
| <p>Element collection mappings also include the following areas:</p> |
| <ul> |
| <li> |
| <p><a href="reference044.htm#CACJBFEA">Value</a></p> |
| </li> |
| <li> |
| <p><a href="reference045.htm#CACJCHJB">Converters</a></p> |
| </li> |
| <li> |
| <p><a href="reference046.htm#CACBIJFD">Ordering</a></p> |
| </li> |
| </ul> |
| </div> |
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