165 lines
9.3 KiB
HTML
165 lines
9.3 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.Type" content="reference" />
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<meta name="DC.Title" content="JDFTVAL (Join Default Values) keyword—join logical files only" />
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<meta name="abstract" content="Use this file-level keyword in a join logical file so the system provides default values for fields when a join to a secondary file does not produce any records. JDFTVAL is valid only for join logical files." />
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<meta name="description" content="Use this file-level keyword in a join logical file so the system provides default values for fields when a join to a secondary file does not produce any records. JDFTVAL is valid only for join logical files." />
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<meta name="DC.subject" content="JDFTVAL (Join Default Values) keyword, Join Default Values (JDFTVAL) keyword" />
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<meta name="keywords" content="JDFTVAL (Join Default Values) keyword, Join Default Values (JDFTVAL) keyword" />
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<meta name="DC.Relation" scheme="URI" content="rzakbmstpdft.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Identifier" content="tdjdftv" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>Physical and Logical Files, JDFTVAL</title>
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</head>
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<body id="tdjdftv"><a name="tdjdftv"><!-- --></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">JDFTVAL (Join Default Values) keyword—join logical files only</h1>
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<div><p>Use this file-level keyword in a join logical file so the system
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provides default values for fields when a join to a secondary file does not
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produce any records. JDFTVAL is valid only for join logical files.</p>
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<div class="section"><p>This keyword has no parameters.</p>
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<p>The default values for the
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system are blanks for character and hexadecimal fields and zeros for numeric
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fields. You can change the default for specific fields by specifying the
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DFT keyword for the fields in the physical file.</p>
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<p>If you specify JDFTVAL,
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your program retrieves records for which a secondary file does not have a
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corresponding record. If you do not specify JDFTVAL, a record in the primary
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file for which there is no corresponding record in a secondary file is skipped.</p>
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<p>If
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you are joining three or more files, and you specify the JDFTVAL keyword for
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fields used as join fields, default values of fields missing in secondary
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files are used in the same way that a field value is used. For example, records
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are selected and omitted based on the default value. Also, if this field is
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used as a join field to join to other secondary files, records from the other
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secondary files are returned to your program based on the default value.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example</h4><p>The following example shows how to specify
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the JDFTVAL keyword.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00010A JDFTVAL
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00020A R RECORD1 JFILE(PF1 PF2)
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00030A J JOIN(PF1 PF2)
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00040A JFLD(NAME NAME)
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00050A NAME JREF(1)
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00060A ADDR
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00070A BAL
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A</pre>
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<p>PF1 is the primary file and PF2 is a secondary file.
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Assume that PF1 and PF2 have the following records:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="void" border="0" rules="none"><thead align="left"><tr><th valign="top" width="20%" id="d0e49">PF1 NAME</th>
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<th valign="top" width="40%" id="d0e51">ADDR</th>
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<th valign="top" width="20%" id="d0e53">PF2 NAME</th>
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<th valign="top" width="20%" id="d0e55">BAL</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="20%" headers="d0e49 ">Anne</td>
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<td valign="top" width="40%" headers="d0e51 ">120 1st St.</td>
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<td valign="top" width="20%" headers="d0e53 ">Anne</td>
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<td valign="top" width="20%" headers="d0e55 ">5.00</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e49 ">Doug</td>
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<td valign="top" width="40%" headers="d0e51 ">40 Pillsbury</td>
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<td valign="top" width="20%" headers="d0e53 ">Doug</td>
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<td valign="top" width="20%" headers="d0e55 ">6.50</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e49 ">Mark</td>
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<td valign="top" width="40%" headers="d0e51 ">2 Lakeside Dr.</td>
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<td valign="top" width="20%" headers="d0e53 ">Sue</td>
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<td valign="top" width="20%" headers="d0e55 ">2.00</td>
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</tr>
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<tr><td valign="top" width="20%" headers="d0e49 ">Sue</td>
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<td valign="top" width="40%" headers="d0e51 ">120 Broadway</td>
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<td valign="top" width="20%" headers="d0e53 "> </td>
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<td valign="top" width="20%" headers="d0e55 "> </td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>With JDFTVAL specified in the join logical file, the program reads
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the following records (shown in arrival sequence):</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="void" border="0" rules="none"><thead align="left"><tr><th valign="top" width="33.33333333333333%" id="d0e101">NAME</th>
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<th valign="top" width="33.33333333333333%" id="d0e103">ADDR</th>
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<th valign="top" width="33.33333333333333%" id="d0e105">BAL</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="33.33333333333333%" headers="d0e101 ">Anne</td>
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<td valign="top" width="33.33333333333333%" headers="d0e103 ">120 1st St.</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">5.00</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e101 ">Doug</td>
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<td valign="top" width="33.33333333333333%" headers="d0e103 ">40 Pillsbury</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">6.50</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e101 ">Mark</td>
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<td valign="top" width="33.33333333333333%" headers="d0e103 ">2 Lakeside Dr.</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">0.00</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e101 ">Sue</td>
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<td valign="top" width="33.33333333333333%" headers="d0e103 ">120 Broadway</td>
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<td valign="top" width="33.33333333333333%" headers="d0e105 ">2.00</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>Without JDFTVAL specified in the join logical file, the program
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can read only three records (no record is found for Mark).</p>
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<p>In this example,
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if you specified JREF(2) instead of JREF(1), the records returned to the program
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might be different, as follows:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="void" border="0" rules="none"><thead align="left"><tr><th valign="top" width="33.33333333333333%" id="d0e147">NAME</th>
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<th valign="top" width="33.33333333333333%" id="d0e149">ADDR</th>
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<th valign="top" width="33.33333333333333%" id="d0e151">BAL</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" width="33.33333333333333%" headers="d0e147 ">Anne</td>
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<td valign="top" width="33.33333333333333%" headers="d0e149 ">120 1st St.</td>
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<td valign="top" width="33.33333333333333%" headers="d0e151 ">5.00</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e147 ">Doug</td>
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<td valign="top" width="33.33333333333333%" headers="d0e149 ">40 Pillsbury</td>
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<td valign="top" width="33.33333333333333%" headers="d0e151 ">6.50</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e147 "> </td>
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<td valign="top" width="33.33333333333333%" headers="d0e149 ">2 Lakeside Dr.</td>
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<td valign="top" width="33.33333333333333%" headers="d0e151 ">0.00</td>
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</tr>
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<tr><td valign="top" width="33.33333333333333%" headers="d0e147 ">Sue</td>
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<td valign="top" width="33.33333333333333%" headers="d0e149 ">120 Broadway</td>
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<td valign="top" width="33.33333333333333%" headers="d0e151 ">2.00</td>
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</tr>
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</tbody>
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</table>
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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="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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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzakbmstpdft.htm" title="Use this field-level keyword to specify a default value for a field.">DFT (Default) keyword—physical files only</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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