65 lines
3.7 KiB
HTML
65 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="reference" />
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<meta name="DC.Title" content="ALWNULL (Allow Null Value) keyword—physical files only" />
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<meta name="abstract" content="Use this field-level keyword to define this field to allow the null value." />
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<meta name="description" content="Use this field-level keyword to define this field to allow the null value." />
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<meta name="DC.subject" content="ALWNULL (Allow Null) keyword, Allow Null (ALWNULL) keyword" />
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<meta name="keywords" content="ALWNULL (Allow Null) keyword, Allow Null (ALWNULL) keyword" />
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<meta name="DC.Relation" scheme="URI" content="rzakbmstlfkeyw.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="tdalwnu" />
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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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<!-- US Government Users Restricted Rights -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Physical and Logical Files, ALWNULL</title>
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</head>
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<body id="tdalwnu"><a name="tdalwnu"><!-- --></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">ALWNULL (Allow Null Value) keyword—physical files only </h1>
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<div><p>Use this field-level keyword to define this field to allow the
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null value.</p>
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<div class="section"><p>This keyword has no parameters.</p>
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<p>When you specify the ALWNULL
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keyword, the maximum length you can specify in positions 30 to 34 is 32 765
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bytes (32 739 if the field is also variable length).</p>
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<p>For physical files,
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when you specify the DATFMT keyword with values of *JOB, *MDY, *DMY, *YMD,
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or *JUL and the field allows null value, you must specify a valid date on
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the DFT keyword for this field.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example</h4><p>The following example shows how to specify
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the ALWNULL keyword.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R RECORD1
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00020A FIELD1 75A ALWNULL
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00030A FIELD2 100A
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00040A FIELD3 L ALWNULL
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00050A DATFMT(*MDY)
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00060A DFT('12/25/93')
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A</pre>
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<p>FIELD1 is defined to allow the null value. The default
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value of FIELD1 is the null value. FIELD2 is defined to not allow the null
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value. The default value of FIELD2 is blanks.</p>
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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="rzakbmstlfkeyw.htm" title="This topic lists valid keyword entries for describing physical and logical files. They are typed in positions 45 through 80 (functions).">Keyword entries for physical and logical files (positions 45 through 80)</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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