84 lines
6.0 KiB
HTML
84 lines
6.0 KiB
HTML
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<meta name="DC.Title" content="System/38-compatible data file utility (DFU/38)" />
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<meta name="abstract" content="DFU/38 data entry applications can be created and used with DDM to work with remote files in the same manner as with local files." />
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<title>System/38-compatible
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data file utility (DFU/38)</title>
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<body id="rbae5dfu38"><a name="rbae5dfu38"><!-- --></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"><span class="keyword">System/38</span>-compatible
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data file utility (DFU/38)</h1>
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<div><p>DFU/38 data entry applications can be created and used with DDM
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to work with remote files in the same manner as with local files.</p>
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<div class="section"><p>If a remote file is on an <span class="keyword">iSeries™ server</span> or <span class="keyword">System/38™</span>, most DFU/38 functions are
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performed with the remote file as though it is a local file. When creating
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or changing a DFU/38 application and the remote file is a logical file, the
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following consideration applies: either DDM files referring to
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each remote based-on file must exist on the source server, and the DDM file
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and library names must match those of the remote based-on files; or, alternatively,
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physical files with the same file and library names and the same record formats
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as the remote based-on files must exist on the source server. Because only
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the record formats are needed from the physical files, they need not contain
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data. Using this alternative, if the record formats of the remote based-on
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files are changed, the record formats on the source server must also be changed
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so that the record formats match.</p>
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</div>
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<div class="section"><p>However, DFU/38 does <em>not</em> support non-<span class="keyword">iSeries</span> or
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non-<span class="keyword">System/38</span> target systems.
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If you attempt to use DFU/38 with non-<span class="keyword">iSeries</span> or
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non-<span class="keyword">System/38</span> remote files,
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you might experience processing problems when trying to change or delete records
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in such a file. Although an <span class="keyword">iSeries server</span> does
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not prevent any user from creating and using such an application, the default
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field descriptions created on the source <span class="keyword">iSeries server</span> for
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the non-<span class="keyword">iSeries</span> or non-<span class="keyword">System/38</span> remote file would probably
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be too general to be useful. (These files appear to be physical files with
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one member, whose member name is the same as the file name. The file has one
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record format and within that format: one field for the entire record, if
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it is a nonkeyed file; two fields for keyed files, one for the key and one
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for the remainder of the record; or more than two fields for keyed files with
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separate key fields.)</p>
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</div>
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<div class="section"><p>All the DFU/38 commands can be used in applications that access
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local files or DDM files. And, wherever a local database file name can be
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specified on any of the DFU command parameters, a DDM file can also be specified,
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as long as any other limitations are met.</p>
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</div>
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<div class="section"><p>A DDM file name can be specified in the SRCFILE parameter of the <span class="cmdname">Create
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DFU Application (CRTDFUAPP)</span> or <span class="cmdname">Retrieve DFU Source (RTVDFUSRC)</span> command,
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but only if the target server is an <span class="keyword">iSeries server</span> or
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a <span class="keyword">System/38</span> and if the target
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file is a source physical file.</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="rbae5sys38tools.htm" title="The topic collection describes the System/38-compatible data file utility (DFU/38) and the System/38-compatible query utility (Query/38).">System/38-compatible database tools</a></div>
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</div>
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</div>
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</body>
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