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-<title>Many-to-many mapping</title>
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-<meta name="date" content="2009-05-01T8:12:46Z" />
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-<meta name="doctitle" content="Many-to-many mapping" />
-<meta name="relnum" content="Release 2.2" />
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-<p><a id="BABEIEGD" name="BABEIEGD"></a></p>
-<div class="sect2"><!-- infolevel="all" infotype="General" -->
-<h1>Many-to-many mapping</h1>
-<p><a id="sthref129" name="sthref129"></a><a id="sthref130" name="sthref130"></a><a id="sthref131" name="sthref131"></a><a id="sthref132" name="sthref132"></a>Use a <span class="bold">Many-to-Many Mapping</span> to define a many-valued association with many-to-many multiplicity. A many-to-many mapping has two sides: the <span class="italic">owning side</span> and <span class="italic">non-owning side</span>. You must specify the join table on the owning side. For bidirectional mappings, either side may be the owning side.</p>
-<ol>
-<li>
-<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map.</p>
-</li>
-<li>
-<p>Right-click the field and then select <span class="bold">Map As &gt; Many-to-Many</span>. 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>Use this table to complete the <a href="ref_mapping_general.htm#CACBHFIJ">General information</a> fields of 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">
-<col width="19%" />
-<col width="*" />
-<col width="41%" />
-<thead>
-<tr align="left" valign="top">
-<th align="left" valign="bottom" id="r1c1-t19">Property</th>
-<th align="left" valign="bottom" id="r1c2-t19">Description</th>
-<th align="left" valign="bottom" id="r1c3-t19">Default</th>
-</tr>
-</thead>
-<tbody>
-<tr align="left" valign="top">
-<td align="left" id="r2c1-t19" headers="r1c1-t19">Mapping Entity Hyperlink</td>
-<td align="left" headers="r2c1-t19 r1c2-t19">Defines this mapping as a <span class="bold">Many to Many Mapping</span>.
-<p>This field corresponds to the <code>@ManyToMany</code> annotation.</p>
-</td>
-<td align="left" headers="r2c1-t19 r1c3-t19">Many to Many</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r3c1-t19" headers="r1c1-t19">Target Entity</td>
-<td align="left" headers="r3c1-t19 r1c2-t19">The entity to which this attribute is mapped.</td>
-<td align="left" headers="r3c1-t19 r1c3-t19">null
-<p>You do not need to explicitly specify the target entity, since it can be inferred from the type of object being referenced.</p>
-</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r4c1-t19" headers="r1c1-t19">Fetch</td>
-<td align="left" headers="r4c1-t19 r1c2-t19">Defines how data is loaded from the database. See <a href="ref_mapping_general.htm#CACGGGHB">"Fetch Type"</a> for details.
-<ul>
-<li>
-<p>Eager</p>
-</li>
-<li>
-<p>Lazy</p>
-</li>
-</ul>
-</td>
-<td align="left" headers="r4c1-t19 r1c3-t19">Lazy</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r5c1-t19" headers="r1c1-t19">Mapped By</td>
-<td align="left" headers="r5c1-t19 r1c2-t19">The database field that owns the relationship.</td>
-<td align="left" headers="r5c1-t19 r1c3-t19"><br /></td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r6c1-t19" headers="r1c1-t19">Order By</td>
-<td align="left" headers="r6c1-t19 r1c2-t19">Specify the default order for objects returned from a query. See <a href="ref_mapping_general.htm#CACDADIH">"Order By"</a> for details.
-<ul>
-<li>
-<p>No ordering</p>
-</li>
-<li>
-<p>Primary key</p>
-</li>
-<li>
-<p>Custom</p>
-</li>
-</ul>
-</td>
-<td align="left" headers="r6c1-t19 r1c3-t19">No ordering</td>
-</tr>
-</tbody>
-</table>
-<br /></div>
-<!-- class="inftblruleinformal" --></li>
-<li>
-<p>Use this table to complete the fields in the <a href="reference011.htm#CACBAEBC">Join Table Information</a> area in 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 Join Table tab of the Persistence Properties view for this mapping." summary="This table lists the fields in the Join Table tab of the Persistence Properties view for this mapping." dir="ltr" border="1" width="100%" frame="border" rules="all" cellpadding="3" cellspacing="0">
-<col width="19%" />
-<col width="*" />
-<col width="38%" />
-<thead>
-<tr align="left" valign="top">
-<th align="left" valign="bottom" id="r1c1-t20">Property</th>
-<th align="left" valign="bottom" id="r1c2-t20">Description</th>
-<th align="left" valign="bottom" id="r1c3-t20">Default</th>
-</tr>
-</thead>
-<tbody>
-<tr align="left" valign="top">
-<td align="left" id="r2c1-t20" headers="r1c1-t20">Name</td>
-<td align="left" headers="r2c1-t20 r1c2-t20">Name of the join table that contains the foreign key column.</td>
-<td align="left" headers="r2c1-t20 r1c3-t20">You must specify the join table on the owning side.
-<p>By default, the name is assumed to be the primary tables associated with the entities concatenated with an underscore.</p>
-</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r3c1-t20" headers="r1c1-t20">Join Columns</td>
-<td align="left" headers="r3c1-t20 r1c2-t20">Select <span class="bold">Override Default</span>, then Add, Edit, or Remove the join columns.</td>
-<td align="left" headers="r3c1-t20 r1c3-t20">By default, the name is assumed to be the primary tables associated with the entities concatenated with an underscore.</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r4c1-t20" headers="r1c1-t20">Inverse Join Columns</td>
-<td align="left" headers="r4c1-t20 r1c2-t20">Select <span class="bold">Override Default</span>, then Add, Edit, or Remove the join columns.</td>
-<td align="left" headers="r4c1-t20 r1c3-t20">By default, the mapping is assumed to have a single join.</td>
-</tr>
-</tbody>
-</table>
-<br /></div>
-<!-- class="inftblruleinformal" --></li>
-<li>
-<p>To add a new Join or Inverse Join Column, click <span class="gui-object-action">Add</span>.</p>
-<p>To edit an existing Join or Inverse Join Column, select the field to and click <span class="gui-object-action">Edit</span>.</p>
-</li>
-</ol>
-<p>Eclipse adds the following annotations to the field:</p>
-<pre xml:space="preserve" class="oac_no_warn">
-@JoinTable(joinColumns=@JoinColumn(name="<span class="italic">&lt;JOIN_COLUMN&gt;</span>"),
- name = "<span class="italic">&lt;JOIN_TABLE_NAME&gt;</span>")
-@ManyToMany(cascade=CascadeType.<span class="italic">&lt;CASCADE_TYPE&gt;</span>, fetch=FetchType.<span class="italic">&lt;FETCH_TYPE&gt;</span>,
- targetEntity=<span class="italic">&lt;TARGET_ENTITY&gt;</span>, mappedBy = "<span class="italic">&lt;MAPPED_BY&gt;</span>")
-@OrderBy("<span class="italic">&lt;ORDER_BY&gt;</span>")
-
-</pre>
-<p>&nbsp;</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>&nbsp;</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>&nbsp;</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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