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<title>Join Table Information</title>
 
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<div class="sect3"><!-- infolevel="all" infotype="General" -->
<h1>Join Table Information</h1>
<p>Use area to specify a mapped column for joining an entity association. By default, the mapping is assumed to have a single join.</p>
<p>This table lists the fields available on the <span class="gui-object-title">Join Table</span> area in <span class="gui-object-title">the JPA Details</span> view for <a href="tasks016.htm#BABHGEBD">One-to-many mapping</a> and <a href="tasks014.htm#BABEIEGD">Many-to-many mapping</a> mapping types.</p>
<div class="inftblruleinformal">
<table class="RuleInformal" title="This table describes the options on the Join Table tab." summary="This table describes the options on the Join Table tab." 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-t11">Property</th>
<th align="left" valign="bottom" id="r1c2-t11">Description</th>
<th align="left" valign="bottom" id="r1c3-t11">Default</th>
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<td align="left" id="r2c1-t11" headers="r1c1-t11">Name</td>
<td align="left" headers="r2c1-t11 r1c2-t11">Name of the join table that contains the foreign key column.</td>
<td align="left" headers="r2c1-t11 r1c3-t11">By default, the name is assumed to be the primary tables associated with the entities concatenated with an underscore.</td>
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<tr align="left" valign="top">
<td align="left" id="r3c1-t11" headers="r1c1-t11"><a id="CACBBDFG" name="CACBBDFG"></a>Join Columns</td>
<td align="left" headers="r3c1-t11 r1c2-t11"><a id="sthref207" name="sthref207"></a><a id="sthref208" name="sthref208"></a>Specify a mapped column for joining an entity association. This field corresponds to the <code>@JoinColum</code> attribute.
<p>Select <span class="bold">Override Default</span>, then Add, Edit, or Remove the join columns.</p>
</td>
<td align="left" headers="r3c1-t11 r1c3-t11">By default, the mapping is assumed to have a single join.</td>
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<tr align="left" valign="top">
<td align="left" id="r4c1-t11" headers="r1c1-t11">Inverse Join Columns</td>
<td align="left" headers="r4c1-t11 r1c2-t11">Select <span class="bold">Override Default</span>, then Add, Edit, or Remove the join columns.</td>
<td align="left" headers="r4c1-t11 r1c3-t11"><br /></td>
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<img src="img/ngrelt.png" alt="Related task" title="Related task" /><br />
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<a href="task_mapping.htm#BABDGBIJ">Mapping an entity</a>
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<a href="reference030.htm#CACCGEHC">Edit Join Columns Dialog</a></div>
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