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| author | nhauge | 2008-05-22 15:43:42 +0000 |
|---|---|---|
| committer | nhauge | 2008-05-22 15:43:42 +0000 |
| commit | f8afeae1e7e8d0c3f63887e84a366b91e5e674ae (patch) | |
| tree | 5443f0f4a4b2f74cf05e3e2efe839dc94f282505 /jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm | |
| parent | 9e6d53b0be6215d37fe1d4cee8a00fb3a21f6646 (diff) | |
| download | webtools.dali-f8afeae1e7e8d0c3f63887e84a366b91e5e674ae.tar.gz webtools.dali-f8afeae1e7e8d0c3f63887e84a366b91e5e674ae.tar.xz webtools.dali-f8afeae1e7e8d0c3f63887e84a366b91e5e674ae.zip | |
232870 - Documentation updates for 2.0.
Diffstat (limited to 'jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm')
| -rw-r--r-- | jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm | 123 |
1 files changed, 109 insertions, 14 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm b/jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm index edec5f8640..b1d59dce06 100644 --- a/jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm +++ b/jpa/plugins/org.eclipse.jpt.doc.user/tasks015.htm @@ -2,40 +2,135 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> -<!-- Run date = January 22, 2008 9:11:20 --> -<meta name="OAC_IGNORE_SKIP_NAV" content="true" /> +<!-- Run date = May 21, 2008 14:42:05 --> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> -<title>Transient mapping</title> +<title>Many-to-one mapping</title> + <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="Content-Script-Type" content="text/javascript" /> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.0" /> <meta name="date" content="2005-07-10T12:57:20+08:00" /> <meta name="robots" content="noarchive" /> -<meta name="doctitle" content="Transient mapping" /> -<meta name="relnum" content="M5 - Release 2.0.0" /> -<meta name="partnum" content="" /> +<meta name="doctitle" content="Many-to-one mapping" /> +<meta name="relnum" content="Release 2.0" /> +<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" /> <link rel="start" href="../../index.htm" title="Home" type="text/html" /> <link rel="contents" href="toc.htm" title="Contents" type="text/html" /> </head> <body> -<p><a id="BABHFHEI" name="BABHFHEI"></a></p> +<p><a id="BABHFAFJ" name="BABHFAFJ"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> -<h1>Transient mapping</h1> -<p><a id="sthref150" name="sthref150"></a><a id="sthref151" name="sthref151"></a><a id="sthref152" name="sthref152"></a><a id="sthref153" name="sthref153"></a>Use the Transient Mapping to specify a field of the entity class that <span class="italic">is not</span> persistent.</p> -<p>To create a transient mapping:</p> +<h1>Many-to-one mapping</h1> +<p><a id="sthref115" name="sthref115"></a><a id="sthref116" name="sthref116"></a><a id="sthref117" name="sthref117"></a><a id="sthref118" name="sthref118"></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 start="1"> <li> -<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected.</p> +<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map.</p> </li> <li> -<p>In the <span class="gui-object-title">Map As</span> field, select <span class="gui-object-action">Transient</span>.</p> +<p>Right click the field and then select <span class="bold">Map As > 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"> +<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">Mapping Entity Hyperlink</td> +<td align="left" headers="r2c1-t22 r1c2-t22">Defines mapping as <span class="bold">Many-to-One</span>. This corresponds to the <code>@ManyToOne</code> annotation.</td> +<td align="left" headers="r2c1-t22 r1c3-t22">Many-to-One</td> +</tr> +<tr align="left" valign="top"> +<td align="left" id="r3c1-t22" headers="r1c1-t22">Target Entity</td> +<td align="left" headers="r3c1-t22 r1c2-t22">The entity to which this attribute is mapped.</td> +<td align="left" headers="r3c1-t22 r1c3-t22">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-t22" headers="r1c1-t22">Fetch</td> +<td align="left" headers="r4c1-t22 r1c2-t22">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-t22 r1c3-t22">Eager</td> +</tr> +<tr align="left" valign="top"> +<td align="left" id="r5c1-t22" headers="r1c1-t22">Cascade</td> +<td align="left" headers="r5c1-t22 r1c2-t22">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-t22 r1c3-t22">Default</td> +</tr> +<tr align="left" valign="top"> +<td align="left" id="r6c1-t22" headers="r1c1-t22">Optional</td> +<td align="left" headers="r6c1-t22 r1c2-t22">Specifies if this field is can be null.</td> +<td align="left" headers="r6c1-t22 r1c3-t22">Yes</td> +</tr> +</tbody> +</table> +<br /></div> +<!-- class="inftblruleinformal" --></li> +<li> +<p>Use this table to complete the fields on the <a href="reference015.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"> +<thead> +<tr align="left" valign="top"> +<th align="left" valign="bottom" id="r1c1-t23">Property</th> +<th align="left" valign="bottom" id="r1c2-t23">Description</th> +<th align="left" valign="bottom" id="r1c3-t23">Default</th> +</tr> +</thead> +<tbody> +<tr align="left" valign="top"> +<td align="left" id="r2c1-t23" headers="r1c1-t23">Join Column</td> +<td align="left" headers="r2c1-t23 r1c2-t23"><a id="sthref119" name="sthref119"></a><a id="sthref120" name="sthref120"></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-t23 r1c3-t23">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 annotation to the field:</p> +<p>Eclipse adds the following annotations to the field:</p> <pre xml:space="preserve" class="oac_no_warn"> -@Transient +@JoinTable(joinColumns=@JoinColumn(name="<span class="italic"><JOIN_COLUMN></span>"), + name = "<span class="italic"><JOIN_TABLE_NAME></span>") +@ManyToOne(targetEntity=<span class="italic"><TARGET_ENTITY></span>, fetch=<span class="italic"><FETCH_TYPE></span>, + cascade=<span class="italic"><CASCADE_TYPE></span>) </pre> <p> </p> <img src="img/ngrelt.png" alt="Related task" title="Related task" /><br /> |