119 lines
6.9 KiB
HTML
119 lines
6.9 KiB
HTML
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<meta name="abstract" content="Use this record-level keyword to identify the physical file(s) containing the data to be accessed through the record format that you are defining." />
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<title>Physical and Logical Files, PFILE</title>
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<body id="lpfile"><a name="lpfile"><!-- --></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">PFILE (Physical File) keyword—logical files only</h1>
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<div><p>Use this record-level keyword to identify the physical file(s)
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containing the data to be accessed through the record format that you are
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defining.</p>
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<div class="section"><div class="p">The format of the keyword is: <pre>PFILE([library-name/]physical-file-name [.32])</pre>
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</div>
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<p>The
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PFILE keyword is required on every record format in a simple or multiple format
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logical file. This keyword is similar to the JFILE keyword except that it
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identifies this file as a simple or multiple format logical file; the PFILE
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keyword is not allowed with the JFILE keyword. Up to 32 physical file names
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can be specified on PFILE keywords in a logical file. If the maximum is being
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used, 32 physical file names can be specified on one record format (using
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one PFILE keyword) or 32 physical file names can be distributed among 32 record
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formats; or, file names can be unevenly distributed among record formats.
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In any case, the maximum number of physical file names allowed is 32. For
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restrictions on specifying multiple physical files when creating a logical
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file, see the appropriate high-level language manual.</p>
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<p>For each physical-file-name,
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a library-name is optional. If the library-name is omitted, the library list
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(*LIBL) that is in effect at file creation time is used.</p>
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<div class="p">If you specify
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more than one physical file name for one record format in a multiple format
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logical file, all fields in the record format for the logical file must exist
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in all physical files specified. This type of file cannot be externally described
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in RPG because it results in duplicate format names. If your program requires
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access to fields that occur in one or more of the physical files specified
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on the PFILE keyword, but not in all of them, you can do one of the following
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tasks:<ul><li>Specify a join logical file. If you do this, use the JFILE keyword instead
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of the PFILE keyword.</li>
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<li>Specify a separate logical file record format that includes fields not
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in the first physical file. <p>For instance, if FLD1 and FLD2 occur in physical
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files PF1, PF2, and PF3, but FLD3 occurs only in PF3, you cannot specify FLD3
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in a logical file record format based on PF1 and PF2. To provide access to
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FLD3, either specify a second logical file record format that includes FLD3
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or use a join logical file.</p>
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<p>You cannot use a simple or multiple format
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logical file to bring together into one record format fields from separate
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physical files. Use a join logical file to accomplish this. A record read
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through the use of a record format in a simple or multiple format logical
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file can contain data from only one physical file, and a record written through
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the use of a record format in a logical file can be stored only in one physical
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file.</p>
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</li>
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</ul>
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</div>
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<p>Distributed data management (DDM) files are allowed on the PFILE
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keyword only when the logical file is being created on a remote system.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Examples</h4><p>The following examples show how to specify
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the PFILE keyword.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 1</h4> <pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R LOGRCD1 PFILE(PF1)
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A</pre>
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<p>In this example, LOGRCD1 can use fields only in PF1.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 2</h4><pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R LOGRCD2 PFILE(PF1 PF2)
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A :
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A :
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00020A R LOGRCD3 PFILE(PF1 PF2 PF3)
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A :
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A :
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A</pre>
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<p>In this example, LOGRCD2 must use fields common to PF1,
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and PF2, and LOGRCD3 must use fields common to PF1, PF2, and PF3.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example 3</h4><pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A R LOGRCD4 PFILE(PF1)
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A :
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A :
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00020A R LOGRCD5 PFILE(PF2)
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A :
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A :
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00030A R LOGRCD6 PFILE(LIB1/PF6)
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A</pre>
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<p>In this example, LOGRCD4, LOGRCD5, and LOGRCD6 can have
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unique fields. LOGRCD6 specifies a qualified physical-file name.</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="rzakbmstlfkeyw.htm" title="This topic lists valid keyword entries for describing physical and logical files. They are typed in positions 45 through 80 (functions).">Keyword entries for physical and logical files (positions 45 through 80)</a></div>
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