72 lines
5.1 KiB
HTML
72 lines
5.1 KiB
HTML
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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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<meta name="DC.Title" content="Variable-length records" />
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<meta name="abstract" content="If your iSeries source server is running OS/400 Version 2 Release 1 Modification 1, DDM supports variable-length record files as defined in the DDM architecture." />
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<meta name="DC.subject" content="variable-length records, record processing, system, iSeries, variable-length records" />
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<title>Variable-length records</title>
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</head>
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<body id="rbae5varlength"><a name="rbae5varlength"><!-- --></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">Variable-length records</h1>
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<div><p>If your <span class="keyword">iSeries™</span> source
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server is running OS/400<sup>®</sup> Version 2 Release 1 Modification 1, DDM supports
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variable-length record files as defined in the DDM architecture.</p>
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<div class="section"><p>You can use DDM on your <span class="keyword">iSeries server</span> to
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open variable-length record files on target systems that are not <span class="keyword">iSeries</span> or S/38 servers. (Initially
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you can open variable-length record files if you are not opening the file
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for updating.) For subsequent read operations, variable-length records are
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padded with blanks to the maximum record length of the file. Trailing blanks
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are removed on write operations.</p>
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</div>
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<div class="section"><p>If your <span class="keyword">iSeries</span> source
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server is running OS/400 Version 2 Release 2 in addition to the Version
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2 Release 1 Modification 1 support mentioned earlier, <span class="keyword">iSeries</span> variable-length
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record access is supported using DDM. Variable-length records can be used
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when opening a variable-length record file on target servers that are not <span class="keyword">iSeries</span> or <span class="keyword">System/38™</span> servers.
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For subsequent read operations against files opened with variable-length records,
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variable-length records are padded with blanks to the maximum record length
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of the file. Also, the actual record length (maximum record length of file
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minus the number of padded blanks) is appended to the end of each record.
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For write operations, the actual record length is used to determine the length
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of the variable-length record to send to the target server. No counting of
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trailing blanks is necessary to determine the actual length of record data.</p>
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</div>
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<div class="section"><p>The target DDM <span class="keyword">iSeries server</span>s
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running at Version 2 Release 2 also support variable-length record files.
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A variable-length record file can be created on the <span class="keyword">iSeries</span> target
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server as a result of a create file request.</p>
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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="rbae5amc.htm" title="Access methods control what subsets of functions can be performed after a particular remote file is opened. This might mean that an iSeries program, or a group of programs sharing a non-iSeries file, cannot do all the same operations that are possible using a file that is on the local iSeries server.">Work with access methods for DDM</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="rbae5ddmcom.htm" title="This topic classifies DDM commands and parameters.">DDM commands and parameters</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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