86 lines
5.8 KiB
HTML
86 lines
5.8 KiB
HTML
<?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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<meta name="DC.Title" content="Handle missing records in secondary join files" />
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<meta name="abstract" content="The system allows you to control whether to allow defaults for missing records in secondary files (similar to the JDFTVAL DDS keyword for a join logical file). You can also specify that only records with defaults be processed. This allows you to select only those records in which there is a missing record in the secondary file." />
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<meta name="description" content="The system allows you to control whether to allow defaults for missing records in secondary files (similar to the JDFTVAL DDS keyword for a join logical file). You can also specify that only records with defaults be processed. This allows you to select only those records in which there is a missing record in the secondary file." />
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<title>Handle missing records in secondary join files</title>
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</head>
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<body id="rbafomrsjf"><a name="rbafomrsjf"><!-- --></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">Handle missing records in secondary join files</h1>
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<div><p>The system allows you to control whether to allow defaults for
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missing records in secondary files (similar to the JDFTVAL DDS keyword for
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a join logical file). You can also specify that only records with defaults
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be processed. This allows you to select only those records in which there
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is a missing record in the secondary file.</p>
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<div class="section" id="rbafomrsjf__rbafomrsjfex1"><a name="rbafomrsjf__rbafomrsjfex1"><!-- --></a><h4 class="sectiontitle">Example: Handle missing records in secondary
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join file</h4><p>This example shows how to read records from the primary
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file that do not have a record in the secondary file.</p>
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<div class="p">In <a href="rbafodynjfex1.htm#rbafodynjfex1">Example 1: Dynamically join database files without DDS</a>,
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the JDFTVAL parameter is not specified, so the only records read are the result
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of a successful join from FILEA to FILEB. If you want a list of the records
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in FILEA that do not have a match in FILEB, you can specify *ONLYDFT on the
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JDFTVAL parameter as shown in the this example: <pre>OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA FILEB) FORMAT(FILEA) +
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JFLD((CUST FILEB/CUST)) +
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MAPFLD((CUST 'FILEA/CUST')) +
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JDFTVAL(*ONLYDFT)
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CALL PGM(PGME) /* Created using file FILEA as input */
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CLOF OPNID(FILEA)
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DLTOVR FILE(FILEA)</pre>
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</div>
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<p>JDFTVAL(*ONLYDFT) causes a record
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to be returned to the program only when there is no equivalent record in the
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secondary file (FILEB).</p>
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<p>Because any values returned by the join operation
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for the fields in FILEB are defaults, it is normal to use only the format
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for FILEA. The records that appear are those that do not have a match in FILEB.
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The FORMAT parameter is required whenever the FILE parameter describes more
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than a single file, but the file name specified can be one of the files specified
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on the FILE parameter. The program is created using FILEA.</p>
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<div class="p">Conversely,
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you can also get a list of all the records where there is a record in FILEB
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that does not have a match in FILEA. You can do this by making the secondary
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file the primary file in all the specifications. You can specify: <pre>OVRDBF FILE(FILEB) SHARE(*YES)
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OPNQRYF FILE(FILEB FILEA) FORMAT(FILEB) JFLD((CUST FILEA/CUST)) +
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MAPFLD((CUST 'FILEB/CUST')) JDFTVAL(*ONLYDFT)
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CALL PGM(PGMF) /* Created using file FILEB as input */
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CLOF OPNID(FILEB)
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DLTOVR FILE(FILEB)</pre>
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<div class="note"><span class="notetitle">Note:</span> The Override with Database File (OVRDBF)
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command in this example uses FILE(FILEB) because it must specify the first
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file on the FILE parameter of the Open Query File (OPNQRYF) command. The Close
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File (CLOF) command also names FILEB. The JFLD and MAPFLD parameters are also
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changed. The program is created using FILEB.</div>
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</div>
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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="rbafodynrs.htm" title="Dynamic record selection allows you to request a subset of the records in a file without using data description specifications (DDS).">Select records without using DDS</a></div>
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</div>
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</div>
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</body>
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</html> |