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| <title>Many-to-Many Mapping</title> |
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| <meta name="doctitle" content="Many-to-Many Mapping" /> |
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| <div class="sect3"><!-- infolevel="all" infotype="General" --> |
| <h1><a id="sthref555" name="sthref555"></a><a id="sthref556" name="sthref556"></a><a id="sthref557" name="sthref557"></a>Many-to-Many Mapping</h1> |
| <div class="inftblhruleinformal"> |
| <table class="HRuleInformal" summary="JPA Details view, One-to-one page" dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
| <col width="29%" /> |
| <col width="*" /> |
| <col width="24%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t37">Property</th> |
| <th align="left" valign="bottom" id="r1c2-t37">Description</th> |
| <th align="left" valign="bottom" id="r1c3-t37">Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t37" headers="r1c1-t37"> |
| <p>Target entity</p> |
| </td> |
| <td align="left" headers="r2c1-t37 r1c2-t37"> |
| <p>The persistent entity to which the attribute is mapped.</p> |
| </td> |
| <td align="left" headers="r2c1-t37 r1c3-t37"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t37" headers="r1c1-t37"> |
| <p>Fetch</p> |
| </td> |
| <td align="left" headers="r3c1-t37 r1c2-t37"> |
| <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-t37 r1c3-t37"> |
| <p>Lazy</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t37" headers="r1c1-t37"> |
| <p>Join fetch</p> |
| </td> |
| <td align="left" headers="r4c1-t37 r1c2-t37"> |
| <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-t37 r1c3-t37"> |
| <p>None</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t37" headers="r1c1-t37"> |
| <p>Cascade</p> |
| </td> |
| <td align="left" headers="r5c1-t37 r1c2-t37"> |
| <p>Specify which operations are propagated throughout the entity.</p> |
| <ul> |
| <li> |
| <p>All – All operations</p> |
| </li> |
| <li> |
| <p>Persist</p> |
| </li> |
| <li> |
| <p>Merge</p> |
| </li> |
| <li> |
| <p>Move</p> |
| </li> |
| <li> |
| <p>Remove</p> |
| </li> |
| <li> |
| <p>Refresh</p> |
| </li> |
| </ul> |
| </td> |
| <td align="left" headers="r5c1-t37 r1c3-t37"> |
| <p>True</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="inftblhruleinformal" --> |
| <p>One-to-many mappings also include the following areas:</p> |
| <ul> |
| <li> |
| <p><a href="reference047.htm#CACIJEGI">Joining Strategy</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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