70 lines
5.0 KiB
HTML
70 lines
5.0 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 name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Describe field use for logical files" />
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<meta name="abstract" content="You can specify that the fields in logical files are to be input-only, both (input/output), or neither fields." />
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<meta name="description" content="You can specify that the fields in logical files are to be input-only, both (input/output), or neither fields." />
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<meta name="DC.subject" content="describing, logical file, field use, field, using logical files, using, logical files to describe, field use, describing use, determining, if multiple record types are needed in files" />
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<meta name="keywords" content="describing, logical file, field use, field, using logical files, using, logical files to describe, field use, describing use, determining, if multiple record types are needed in files" />
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<meta name="DC.Relation" scheme="URI" content="rbafodrflf.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafobboth.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafoinput.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafoneith.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="rbafodeffd" />
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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>Describe field use for logical files</title>
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</head>
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<body id="rbafodeffd"><a name="rbafodeffd"><!-- --></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">Describe field use for logical files</h1>
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<div><p>You can specify that the fields in logical files are to be input-only,
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both (input/output), or neither fields.</p>
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<div class="p">Do this by specifying one of the following items in position 38: <dl><dt><strong>Entry</strong></dt>
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<dd><strong>Meaning</strong></dd>
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<dt class="dlterm">Blank</dt>
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<dd>For simple or multiple format logical files, defaults to B (both) For
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join logical files, defaults to I (input only).</dd>
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<dt class="dlterm">B</dt>
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<dd>Both input and output allowed; not valid for join logical files.</dd>
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<dt class="dlterm">I</dt>
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<dd>Input only (read only). </dd>
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<dt class="dlterm">N</dt>
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<dd>Neither input nor output; valid only for join logical files. </dd>
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</dl>
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<div class="note"><span class="notetitle">Note:</span> The usage value (in position 38) is not used on a reference
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function. When another file refers to a field (using a REF or REFFLD keyword)
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in a logical file, the usage value is not copied into that file.</div>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbafobboth.htm">Describe field use for logical files: Both</a></strong><br />
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A both field can be used for both input and output operations. Your program can read data from the field and write data to the field. Both fields are not valid for join logical files because join logical files are read-only files.</li>
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<li class="ulchildlink"><strong><a href="rbafoinput.htm">Describe field use for logical files: Input only</a></strong><br />
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An input-only field can be used for read operations only. Your program can read data from the field, but cannot update the field in the file.</li>
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<li class="ulchildlink"><strong><a href="rbafoneith.htm">Describe field use for logical files: Neither</a></strong><br />
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A neither field is used neither for input nor for output. A neither field is valid only for join logical files. It can be used as a join field in a join logical file, but your program cannot read or update a neither field.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafodrflf.htm" title="For every logical file record format described with data description specifications (DDS), you must specify a record format name and either the PFILE keyword (for simple and multiple format logical files), or the JFILE keyword (for join logical files).">Describe logical file record formats</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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