57 lines
3.5 KiB
HTML
57 lines
3.5 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="concept" />
|
||
|
|
<meta name="DC.Title" content="Read by key operation" />
|
||
|
|
<meta name="abstract" content="This operation gets the record identified by the key value." />
|
||
|
|
<meta name="description" content="This operation gets the record identified by the key value." />
|
||
|
|
<meta name="DC.Relation" scheme="URI" content="rbafordbrk.htm" />
|
||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
||
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
||
|
|
<meta name="DC.Format" content="XHTML" />
|
||
|
|
<meta name="DC.Identifier" content="rbafordkoksap" />
|
||
|
|
<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>Read by key operation</title>
|
||
|
|
</head>
|
||
|
|
<body id="rbafordkoksap"><a name="rbafordkoksap"><!-- --></a>
|
||
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
||
|
|
<h1 class="topictitle1">Read by key operation</h1>
|
||
|
|
<div><p><span>This operation gets the record identified by the key value.</span></p>
|
||
|
|
<p> Key operations of equal, equal or after, equal or before, read previous
|
||
|
|
key equal, read next key equal, after, or before can be specified. If a format
|
||
|
|
name is specified, the system searches for a record of the specified key value
|
||
|
|
and record format name. If a format name is not specified, the entire keyed
|
||
|
|
sequence access path is searched for the specified key value. If the key definition
|
||
|
|
for the file includes multiple key fields, a partial key can be specified
|
||
|
|
(you can specify either the number of key fields or the key length to be used).
|
||
|
|
This allows you to do generic key searches. If the program does not specify
|
||
|
|
a number of key fields, the system assumes a default number of key fields.
|
||
|
|
This default varies depending on if a record format name is passed by the
|
||
|
|
program. If a record format name is passed, the default number of key fields
|
||
|
|
is the total number of key fields defined for that format. If a record format
|
||
|
|
name is not passed, the default number of key fields is the maximum number
|
||
|
|
of key fields that are common across all record formats in the access path.
|
||
|
|
The program must supply enough key data to match the number of key fields
|
||
|
|
assumed by the system. (The CHAIN statement in the RPG/400<sup>®</sup> language and the READ statement
|
||
|
|
in the COBOL/400<sup>®</sup> language
|
||
|
|
are examples of this operation.)</p>
|
||
|
|
</div>
|
||
|
|
<div>
|
||
|
|
<div class="familylinks">
|
||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafordbrk.htm" title="These read operations can be used with a keyed sequence access path to get database records.">Read database records using a keyed sequence access path</a></div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|