91 lines
5.2 KiB
HTML
91 lines
5.2 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8"?>
|
|||
|
|
<!DOCTYPE html
|
|||
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|||
|
|
<html lang="en-us" xml:lang="en-us">
|
|||
|
|
<head>
|
|||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|||
|
|
<meta name="security" content="public" />
|
|||
|
|
<meta name="Robots" content="index,follow" />
|
|||
|
|
<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))' />
|
|||
|
|
<meta name="DC.Type" content="reference" />
|
|||
|
|
<meta name="DC.Title" content="VARLEN (Variable-Length Field) keyword for physical and logical files" />
|
|||
|
|
<meta name="abstract" content="Use this field-level keyword to define this field as a variable-length field." />
|
|||
|
|
<meta name="description" content="Use this field-level keyword to define this field as a variable-length field." />
|
|||
|
|
<meta name="DC.subject" content="VARLEN (Variable-Length Field) keyword, Variable-Length Field (VARLEN) keyword" />
|
|||
|
|
<meta name="keywords" content="VARLEN (Variable-Length Field) keyword, Variable-Length Field (VARLEN) keyword" />
|
|||
|
|
<meta name="DC.Relation" scheme="URI" content="rzakbmstlfkeyw.htm" />
|
|||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
|
|||
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
|
|||
|
|
<meta name="DC.Format" content="XHTML" />
|
|||
|
|
<meta name="DC.Identifier" content="tdvarle" />
|
|||
|
|
<meta name="DC.Language" content="en-us" />
|
|||
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|||
|
|
<!-- US Government Users Restricted Rights -->
|
|||
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|||
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|||
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|||
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|||
|
|
<title>Physical and Logical Files, VARLEN</title>
|
|||
|
|
</head>
|
|||
|
|
<body id="tdvarle"><a name="tdvarle"><!-- --></a>
|
|||
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|||
|
|
<h1 class="topictitle1">VARLEN (Variable-Length Field) keyword for physical and logical files</h1>
|
|||
|
|
<div><p>Use this field-level keyword to define this field as a variable-length
|
|||
|
|
field.</p>
|
|||
|
|
<div class="section"><p>Variable-length fields are useful for improving storage when the
|
|||
|
|
data for the field typically fits within a certain length, but can occasionally
|
|||
|
|
be longer. Specify the maximum length of the field in positions 30 to 34.
|
|||
|
|
You can specify the allocated length (or typical length) in the parameter.</p>
|
|||
|
|
<div class="p">The
|
|||
|
|
format of the keyword is: <pre>VARLEN[(allocated-length)]</pre>
|
|||
|
|
</div>
|
|||
|
|
<p>The
|
|||
|
|
allocated-length parameter is optional. Use it to specify the number of bytes
|
|||
|
|
(two byte characters in the case of graphic fields) allocated for the field
|
|||
|
|
in the fixed portion of the file. If you do not specify the allocated-length
|
|||
|
|
parameter, the data for this field is stored in the variable length portion
|
|||
|
|
of the file.</p>
|
|||
|
|
<p>Valid values for the allocated-length parameter are 1 to
|
|||
|
|
the maximum length of the field specified in positions 30 to 34.</p>
|
|||
|
|
<p>The
|
|||
|
|
VARLEN keyword has no parameters for a logical file.</p>
|
|||
|
|
<p>The VARLEN keyword
|
|||
|
|
is valid only on character fields and graphic fields.</p>
|
|||
|
|
<p>When you specify
|
|||
|
|
the VARLEN keyword, the maximum length you can specify in positions 30 to
|
|||
|
|
34 is 32 740 (32 739 if the field allows the null value). If the
|
|||
|
|
field is a graphic field, the maximum length you can specify is 16 370.</p>
|
|||
|
|
<p>If
|
|||
|
|
you specify the DFT keyword for a variable-length field, the length of the
|
|||
|
|
default value must be less than or equal to the allocated length for the field.
|
|||
|
|
If the default value is longer than the allocated length, an error message
|
|||
|
|
is issued when the file is created.</p>
|
|||
|
|
<p>If you specify a hexadecimal value
|
|||
|
|
as the default value for a variable-length field, the number of hexadecimal
|
|||
|
|
characters must be equal to two times the allocated length for the field.</p>
|
|||
|
|
<p>The
|
|||
|
|
DFT keyword is not allowed on the same field as a VARLEN keyword unless you
|
|||
|
|
specify a value for the allocated-length parameter.</p>
|
|||
|
|
<p>Do not specify the
|
|||
|
|
VARLEN keyword on a date, time, or timestamp field (L, T, or Z in position
|
|||
|
|
35).</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="example"><h4 class="sectiontitle">Example</h4><p>The following example shows how to specify
|
|||
|
|
the VARLEN keyword for a physical file.</p>
|
|||
|
|
<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
|
|||
|
|
00010A R RECORD1
|
|||
|
|
00020A FIELD1 100A VARLEN(30)
|
|||
|
|
00030A FIELD2 200A VARLEN
|
|||
|
|
A</pre>
|
|||
|
|
<p>FIELD1 is defined as a variable-length field with a maximum
|
|||
|
|
length of 100 and an allocated length of 30. FIELD2 is defined
|
|||
|
|
as a variable-length field with a maximum length of 200 and no allocated length.</p>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
<div class="familylinks">
|
|||
|
|
<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>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|