94 lines
5.9 KiB
HTML
94 lines
5.9 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 name="security" content="public" />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Reference for physical and logical files (position 29)" />
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<meta name="abstract" content="You use this position to specify reference for physical files only." />
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<meta name="description" content="You use this position to specify reference for physical files only." />
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<meta name="DC.subject" content="reference, logical files, physical files" />
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<meta name="keywords" content="reference, logical files, physical files" />
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<meta name="DC.Relation" scheme="URI" content="rzakbmstlfpos.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakbmstpref.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakbmstpreffld.htm" />
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<meta name="DC.Relation" scheme="URI" content="../dds/specref.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzakbmstpreffld.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="pfrefer" />
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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="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Reference for physical and logical files (position 29)</title>
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</head>
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<body id="pfrefer"><a name="pfrefer"><!-- --></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">Reference for physical and logical files (position 29)</h1>
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<div><p>You use this position to specify reference for physical files only.</p>
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<div class="section"><p>For a logical file, leave this position blank. All logical files
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automatically provide the reference capability for all specified fields. Any
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attributes that are not specified explicitly in the logical file are furnished
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from the corresponding field in the physical file record format.</p>
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<p>For
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a physical file, specify R in this position to refer to the attributes of
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a previously defined named field (called the <dfn class="term">referenced field</dfn>).
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You must specify the REF or the REFFLD keyword. The referenced field can be
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previously defined in either the physical file you are defining or a previously
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created database file. The field attributes referred to are the length, data
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type, and decimal positions of the field, as well as the ALIAS, COLHDG, DATFMT,
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DATSEP, FLTPCN, REFSHIFT, TEXT, TIMFMT, TIMSEP, VARLEN, editing, and validity
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checking keywords.</p>
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<p>If R is not specified, you must specify the field
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attributes for this field.</p>
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<div class="note"><span class="notetitle">Note:</span> If the DATFMT keyword is overridden on
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a reference field to *ISO, *EUR, *USA, or *JIS, the DATSEP keyword is not
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referenced.</div>
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<p>Position 29 must be blank at the file and record levels.</p>
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<p>The
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referenced field name cannot be the same as the field you are defining if
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that field is in the file you are defining. If the names are the same, specify
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the name of the file defining the referenced field as a parameter value with
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the REF or REFFLD keyword. If the names are different, specify the name of
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the referenced field with the REFFLD keyword.</p>
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<div class="p">To override
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specific attributes of the referenced field, specify those attributes for
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the field you are defining. In addition: <ul><li>If you specify Edit Code (EDTCDE) or Edit Word (EDTWRD) on the field,
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no editing specifications are copied from the referenced field.</li>
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<li>If you specify CHECK (AB, ME, MF, M10, M10F, M11, M11F, VN, or VNE), CHKMSGID,
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COMP, RANGE, or VALUES on the field, no validity checking specifications are
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copied from the referenced field.</li>
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<li>If you specify data type, field length, or decimal positions for the field
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you are defining, then neither editing nor validity checking keywords are
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copied from the referenced field.</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> After the physical file is created, the referenced file can be
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deleted or changed without affecting the field descriptions in the physical
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file. To incorporate changes made in the referenced file, delete and re-create
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the physical file.</div>
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</div>
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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="rzakbmstlfpos.htm" title="The first 44 positions of the DDS form are called positional entries.">Positional entries for physical and logical files (positions 1 through 44)</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzakbmstpref.htm" title="Use this file-level keyword to specify the name of the file from which field descriptions are retrieved.">REF (Reference) keyword—physical files only</a></div>
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<div><a href="rzakbmstpreffld.htm" title="Use this field-level keyword to refer to a field under one of these three conditions.">REFFLD (Referenced Field) keyword—physical files only</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../dds/specref.htm">When to specify REF and REFFLD keywords for DDS files</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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