76 lines
5.9 KiB
HTML
76 lines
5.9 KiB
HTML
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<meta name="abstract" content="Compiled programs can refer to DDM files. In addition, DDM file names can be specified on the Create PL/I Program (CRTPLIPGM) command." />
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<title>PL/I considerations for DDM</title>
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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 considerations for DDM</h1>
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<div><p>Compiled programs can refer to DDM files. In addition, DDM file
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names can be specified on the <span class="cmdname">Create PL/I Program (CRTPLIPGM)</span> command. </p>
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<div class="section"><ul><li>A DDM file name can be specified on the SRCFILE parameter, and a member
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name can be specified on the SRCMBR parameter, but only if the remote source
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file is on an <span class="keyword">iSeries™ server</span> or a <span class="keyword">System/38™</span>. The same is true for specifying
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DDM file and member names on the %INCLUDE source directive statement. If the
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remote file referred to by the DDM file is not on an <span class="keyword">iSeries server</span> or
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a <span class="keyword">System/38</span>, an error occurs
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if a DDM file name is specified on the CRTPLIPGM command or %INCLUDE statement.</li>
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<li>When a DDM file is accessed as the source file for a program, the margins
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used in the compilation of the source are the default values of 2 and 72.
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No other margin values can be specified.</li>
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<li>If a %INCLUDE DDS directive statement specifies the name of a DDM file,
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the record descriptions of the remote file are included in the compiled program.
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However, if the remote file is not on an <span class="keyword">iSeries server</span> or
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a <span class="keyword">System/38</span>, the field declares
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for the record descriptions do not have meaningful names. Instead, all of
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the field names are declared as F<em>nnnnn</em> and the key fields are declared
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as K<em>nnnnn</em>.</li>
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</ul>
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</div>
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<div class="section"><p>A DDM file can be used to refer to remote record files or remote
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stream files. When a program opens a DDM file on the source server, the
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following types of statements can be used to perform I/O operations on the
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remote file at the target server, for both <span class="keyword">iSeries</span> and
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non-<span class="keyword">iSeries</span> targets: OPEN,
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CLOSE, READ, WRITE, REWRITE, and DELETE statements for processing record files,
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and GET and PUT statements for processing stream files.</p>
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</div>
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<div class="section"><p>Another consideration is if the target server is not an <span class="keyword">iSeries server</span> or a <span class="keyword">System/38</span>,
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the POSITION parameter on a keyed READ statement to read from a remote file
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does not work if a value of NXTEQL, PRVEQL, NXTUNQ, or PRVUNQ is specified
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for the parameter. (The values of NEXT, PREVIOUS, FIRST, and LAST do work.)
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All the values are valid if the target system is an <span class="keyword">iSeries server</span> or
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a <span class="keyword">System/38</span>.</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="rbae5plc.htm" title="DDM is supported by these iSeries languages.">Programming language considerations for DDM</a></div>
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