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authornhauge2011-11-09 10:50:09 -0500
committernhauge2011-11-09 10:50:09 -0500
commit66417f40546ba380604d1f90fcd42c898090e9fb (patch)
tree7e78089e7e1ac301b31bd40bd3b633f8cfa83909 /jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm
parent5df180c313a919fa82fc345ea4cb31af648c6079 (diff)
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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
- "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=us-ascii" />
-
-<meta http-equiv="Content-Style-Type" content="text/css" />
-<meta http-equiv="Content-Script-Type" content="text/javascript" />
-<title>Many-to-one mapping</title>
-<meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1" />
-<meta name="date" content="2010-05-19T8:12:44Z" />
-<meta name="robots" content="noarchive" />
-<meta name="doctitle" content="Many-to-one mapping" />
-<meta name="relnum" content="Release 2.3" />
-<meta name="copyright" content="Copyright (c) 2000, 2008 oracle . All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html. Contributors: Oracle - initial API and implementation" />
-<link rel="copyright" href="dcommon/html/cpyr.htm" title="Copyright" type="text/html" />
-<link rel="stylesheet" href="dcommon/css/blafdoc.css" title="Oracle BLAFDoc" type="text/css" />
-<!-- contents -->
-</head>
-<body>
-<p><a id="BABHFAFJ" name="BABHFAFJ"></a></p>
-<div class="sect2"><!-- infolevel="all" infotype="General" -->
-<h1>Many-to-one mapping</h1>
-<p><a id="sthref134" name="sthref134"></a><a id="sthref135" name="sthref135"></a><a id="sthref136" name="sthref136"></a><a id="sthref137" name="sthref137"></a>Use a <span class="bold">Many-to-One</span> mapping to defines a single-valued association to another entity class that has many-to-one multiplicity.</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-One</span>. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected.</p>
-</li>
-<li>
-<p>Use this table to complete the <a href="ref_mapping_general.htm#CACBHFIJ">General information</a> fields JPA Details view.</p>
-<div class="inftblruleinformal">
-<table class="RuleInformal" title="This table lists the fields ion the General tab for this mapping." summary="This table lists the fields ion the General tab 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-t21">Property</th>
-<th align="left" valign="bottom" id="r1c2-t21">Description</th>
-<th align="left" valign="bottom" id="r1c3-t21">Default</th>
-</tr>
-</thead>
-<tbody>
-<tr align="left" valign="top">
-<td align="left" id="r2c1-t21" headers="r1c1-t21">Mapping Entity Hyperlink</td>
-<td align="left" headers="r2c1-t21 r1c2-t21">Defines mapping as <span class="bold">Many-to-One</span>. This corresponds to the <code>@ManyToOne</code> annotation.</td>
-<td align="left" headers="r2c1-t21 r1c3-t21">Many-to-One</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r3c1-t21" headers="r1c1-t21">Target Entity</td>
-<td align="left" headers="r3c1-t21 r1c2-t21">The entity to which this attribute is mapped.</td>
-<td align="left" headers="r3c1-t21 r1c3-t21">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-t21" headers="r1c1-t21">Fetch</td>
-<td align="left" headers="r4c1-t21 r1c2-t21">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-t21 r1c3-t21">Eager</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r5c1-t21" headers="r1c1-t21">Cascade</td>
-<td align="left" headers="r5c1-t21 r1c2-t21">See <a href="ref_mapping_general.htm#CACJAIHB">"Cascade Type"</a> for details.
-<ul>
-<li>
-<p>Default</p>
-</li>
-<li>
-<p>All</p>
-</li>
-<li>
-<p>Persist</p>
-</li>
-<li>
-<p>Merge</p>
-</li>
-<li>
-<p>Remove</p>
-</li>
-</ul>
-</td>
-<td align="left" headers="r5c1-t21 r1c3-t21">Default</td>
-</tr>
-<tr align="left" valign="top">
-<td align="left" id="r6c1-t21" headers="r1c1-t21">Optional</td>
-<td align="left" headers="r6c1-t21 r1c2-t21">Specifies if this field is can be null.</td>
-<td align="left" headers="r6c1-t21 r1c3-t21">Yes</td>
-</tr>
-</tbody>
-</table>
-<br /></div>
-<!-- class="inftblruleinformal" --></li>
-<li>
-<p>Use this table to complete the fields on the <a href="reference012.htm#CACFCEJC">Join Columns Information</a> tab 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 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-t22">Property</th>
-<th align="left" valign="bottom" id="r1c2-t22">Description</th>
-<th align="left" valign="bottom" id="r1c3-t22">Default</th>
-</tr>
-</thead>
-<tbody>
-<tr align="left" valign="top">
-<td align="left" id="r2c1-t22" headers="r1c1-t22">Join Column</td>
-<td align="left" headers="r2c1-t22 r1c2-t22"><a id="sthref138" name="sthref138"></a><a id="sthref139" name="sthref139"></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="r2c1-t22 r1c3-t22">By default, the mapping is assumed to have a single join.</td>
-</tr>
-</tbody>
-</table>
-<br /></div>
-<!-- class="inftblruleinformal" --></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>")
-@ManyToOne(targetEntity=<span class="italic">&lt;TARGET_ENTITY&gt;</span>, fetch=<span class="italic">&lt;FETCH_TYPE&gt;</span>,
- cascade=<span class="italic">&lt;CASCADE_TYPE&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>
-<!-- class="sect2" -->
-<!-- Start Footer -->
-<div class="footer">
-<table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%">
-<col width="86%" />
-<col width="*" />
-<tr>
-<td align="left"><span class="copyrightlogo">Copyright&nbsp;&copy;&nbsp;2006, 2010,&nbsp;Oracle&nbsp;and/or&nbsp;its&nbsp;affiliates.&nbsp;All&nbsp;rights&nbsp;reserved.</span><br />
-<a href="dcommon/html/cpyr.htm"><span class="copyrightlogo">Legal Notices</span></a></td>
-</tr>
-</table>
-</div>
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