80 lines
4.9 KiB
HTML
80 lines
4.9 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="PL/I input/output requests" />
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<meta name="abstract" content="This topic discusses the types of PL/I input/output requests and their restrictions." />
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<meta name="description" content="This topic discusses the types of PL/I input/output requests and their restrictions." />
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<meta name="DC.Relation" scheme="URI" content="rbae5xplcon.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbae5plop.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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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>PL/I input/output requests</title>
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</head>
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<body id="rbae5pliio"><a name="rbae5pliio"><!-- --></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">PL/I input/output requests</h1>
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<div><p>This topic discusses the types of PL/I input/output
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requests and their restrictions.</p>
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<div class="section"><h4 class="sectiontitle">Read requests</h4><ul><li>A KEYSEARCH parameter value of BEFORE or EQLBFR is not supported by CICS/DDM
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when accessing a VSAM path. However, these parameter values are supported
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when accessing a VSAM KSDS.</li>
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<li>A POSITION parameter value of PREVIOUS and LAST is not supported when
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accessing a VSAM path. However, these parameter values are supported when
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accessing a VSAM KSDS.</li>
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<li>Because the DIRECT or SEQUENTIAL KEYED attributes cannot be used to open
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a VSAM ESDS, it is not possible to access records by relative record number
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or to have the relative record number returned by using the KEY and KEYTO parameters. </li>
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<li>Because VSAM KSDS and VSAM alternate indexes are always defined as a single
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key field, the NBRKEYFLDS parameter should not be used.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Write requests</h4><ul><li>The KEYFROM parameter does not work when writing a record to a VSAM RRDS.</li>
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<li>The WRITE request does not work when writing a record to VSAM KSDS that
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already contains a record with the same key value.</li>
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<li>Because the OUTPUT or UPDATE file attribute cannot be used to open a VSAM
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path, it is not possible to write records to a VSAM path. Instead, the application
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program must write the record by using the base data set of the VSAM path.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Rewrite requests</h4><ul><li>The REWRITE does not work if rewriting a record of a VSAM KSDS when the
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key value of the record is changed.</li>
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<li>Because the UPDATE file attribute cannot be used to open a VSAM path,
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it is not possible to rewrite records in a VSAM path. Instead, the application
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program must rewrite the record by using the base data set of the VSAM path.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Delete requests</h4><ul><li>The DELETE does not work when deleting the record of a VSAM ESDS.</li>
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<li>Because the UPDATE file attribute cannot be used to open a VSAM path,
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it is not possible to delete records in a VSAM path. Instead, the application
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program must delete the records by using the base data set of the VSAM path.
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However, if the base data set of the VSAM path is a VSAM ESDS, the DELETE
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does not work.</li>
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</ul>
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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="rbae5xplcon.htm" title="These topics summarize the limitations that exist when using PL/I to access remote VSAM data sets from an iSeries server. These limitations should be considered in addition to those already stated in this topic collection.">PL/I considerations</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="rbae5plop.htm" title="The i5/OS DDM user can access remote CICS files with PL/I programs.">PL/I open file requests</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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