57 lines
3.7 KiB
HTML
57 lines
3.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Details: Specify referential constraint update rules" />
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<meta name="abstract" content="This topic lists the possible values for the UPDRULE parameter. The UPDRULE parameter identifies the update rule for the constraint relationship between parent and dependent files. The update rule specifies the action the system takes when it attempts to update the parent file." />
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<meta name="description" content="This topic lists the possible values for the UPDRULE parameter. The UPDRULE parameter identifies the update rule for the constraint relationship between parent and dependent files. The update rule specifies the action the system takes when it attempts to update the parent file." />
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<meta name="DC.Relation" scheme="URI" content="rbaforzahfrck.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbaforzahfrcm" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Details: Specify referential constraint update rules</title>
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</head>
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<body id="rbaforzahfrcm"><a name="rbaforzahfrcm"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Details: Specify referential constraint update rules</h1>
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<div><p>This topic lists the possible values for the UPDRULE parameter.
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The UPDRULE parameter identifies the update rule for the constraint relationship
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between parent and dependent files. The update rule specifies the action the
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system takes when it attempts to update the parent file.</p>
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<div class="p"><ul><li>*NOACTION (the default value) <ul><li>Record update in a parent file does not occur if there is a matching foreign
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key value in the dependent file.</li>
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</ul>
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</li>
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<li>*RESTRICT <ul><li>Record update in a parent file does not occur if a value of the non-null
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parent key matches a foreign key value.</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> The system enforces an update *RESTRICT rule immediately when
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you attempt the update operation. The system enforces other constraints at
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the logical end of the operation. For example, a trigger program can add a
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parent record if one does not exist. The *RESTRICT rule does not prevent the
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violation.</div>
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</li>
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</ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbaforzahfrck.htm" title="Referential constraints allow you to specify rules that you want the system to enforce when you delete or update records.">Specify referential constraint rules</a></div>
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</div>
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</div>
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</body>
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</html>
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