71 lines
4.1 KiB
HTML
71 lines
4.1 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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<meta name="DC.Title" content="DDS syntax for a simple logical file" />
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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>DDS syntax for a simple logical file</title>
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</head>
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<body id="lfexam"><a name="lfexam"><!-- --></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">DDS syntax for a simple logical file</h1>
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<div><div class="fignone"><br /><img src="rv2f115.gif" alt="Syntax for a Simple Logical
File. An illustration of a DDS coding form that describes a simple logical
file." /><br /></div>
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<dl><dt class="dlterm"><span>1</span></dt>
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<dd>Comments (optional): Comments can appear on any line in DDS. They are
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identified by an asterisk in position 7.</dd>
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<dt class="dlterm"><span>2</span></dt>
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<dd>File level (optional): File-level keywords appear before the record format
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name (RECORD1 on line 00040).</dd>
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<dt class="dlterm"><span>3</span></dt>
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<dd>Record level (at least one is required): R in position 17 identifies
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RECORD1 as a record format name. In simple or multiple format logical files,
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the PFILE keyword is required for every record format. The record level continues
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until the first field is named.</dd>
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<dt class="dlterm"><span>4</span></dt>
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<dd>Field level: Field names and field attributes are
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not required for logical files.</dd>
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<dt class="dlterm"><span>5</span></dt>
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<dd>Key field level (optional): K in position 17 identifies the field as a
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key field. A K must be specified for each key field. Specify the key field
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level by repeating one or more field names (such as FIELDA) after the field-level
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specifications.</dd>
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<dt class="dlterm"><span>6</span></dt>
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<dd>Select and omit levels (optional): S in position 17 identifies FIELDB
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as a select field. (O in position 17 identifies a field as an omit field.)
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The select and omit levels follow the key field level.</dd>
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</dl>
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<div class="note"><span class="notetitle">Notes:</span> <ol><li>To form a multiple-format logical file, specify more record
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formats within the file by repeating items <span>3</span> through <span>6</span>,
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or specify more than one file on the PFILE keyword.</li>
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<li>See the <a href="../rzakb/rzakbmstlfpos.htm">Positional
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entries for physical and logical files</a> topic for a description of each
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of the columns shown in the figure.</li>
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</ol>
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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="syntaxexam.htm" title="These topics provide syntax coding examples. Except for HLPARA, JFILE, JFLD, and PFILE, the keywords shown in these examples are not actual keywords. They indicate where you should specify the keywords.">Examples: DDS syntax coding</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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