100 lines
5.6 KiB
HTML
100 lines
5.6 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="Example 7: Select records using the Open Query File (OPNQRYF) command" />
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<meta name="abstract" content="This example shows how to map fields for packed numeric data fields using the Open Query File (OPNQRYF) command." />
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<meta name="description" content="This example shows how to map fields for packed numeric data fields using the Open Query File (OPNQRYF) command." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example 7: Select records using the Open Query File (OPNQRYF) command</title>
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</head>
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<body id="rbafoqrymapf"><a name="rbafoqrymapf"><!-- --></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">Example 7: Select records using the Open Query File (OPNQRYF) command</h1>
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<div><p>This example shows how to map fields for packed numeric data fields
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using the Open Query File (OPNQRYF) command. </p>
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<div class="section"><p>Assume that you have a packed decimal <em>Date</em> field in the
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format MMDDYY and you want to select all the records for the year 1988. You
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cannot select records directly from a portion of a packed decimal field, but
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you can use the MAPFLD parameter on the OPNQRYF command to create a new field
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that you can then use for selecting part of the field.</p>
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</div>
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<div class="section"><p>The format of each mapped field definition is:</p>
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</div>
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<div class="section"><p>(result field 'expression' attributes)</p>
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</div>
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<div class="section"><div class="p">where: <dl><dt class="dlterm">result field</dt>
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<dd>The name of the result field.</dd>
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<dt class="dlterm">expression</dt>
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<dd>How the result field should be derived. The expression can include substring,
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other built-in functions, or mathematical statements.</dd>
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<dt class="dlterm">attributes</dt>
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<dd>The optional attributes of the result field. If no attributes are given
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(or the field is not defined in a file), the OPNQRYF command calculates a
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field attribute determined by the fields in the expression.</dd>
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</dl>
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</div>
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</div>
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<div class="example"> <pre>OVRDBF FILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA) QRYSLT('YEAR *EQ "88" ') +
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MAPFLD((CHAR6 '%DIGITS(DATE)') +
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(YEAR '%SST(CHAR6 5 2)' *CHAR 2))
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CALL PGM(PGMC)
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CLOF OPNID(FILEA)
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DLTOVR FILE(FILEA)</pre>
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</div>
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<div class="section"><div class="p">In this example, if DATE was a date data type, it can be specified
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as follows: <pre>OPNQRYF FILE(FILEA) +
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QRYSLT ('YEAR *EQ 88') +
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MAPFLD((YEAR '%YEAR(DATE)'))</pre>
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</div>
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</div>
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<div class="section"><p>The first mapped field definition specifies that the <em>Char6</em> field
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be created from the packed decimal <em>Date</em> field. The %DIGITS function
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converts from packed decimal to character and ignores any decimal definitions
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(that is, 1234.56 is converted to '123456'). Because no definition of the <em>Char6</em> field
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is specified, the system assigns a length of 6. The second mapped field defines
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the <em>Year</em> field as type *CHAR (character) and length 2. The expression
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uses the substring function to map the last 2 characters of the <em>Char6</em> field
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into the <em>Year</em> field.</p>
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</div>
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<div class="section"><div class="p">Note that the mapped field definitions are processed in the order
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in which they are specified. In this example, the <em>Date</em> field was converted
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to character and assigned to the <em>Char6</em> field. Then, the last two digits
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of the <em>Char6</em> field (the year) were assigned to the <em>Year</em> field.
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Any changes to this order would have produced an incorrect result.<div class="note"><span class="notetitle">Note:</span> Mapped
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field definitions are always processed before the QRYSLT parameter is evaluated.</div>
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</div>
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</div>
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<div class="section"><div class="p">You can accomplish the same result by specifying the substring
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on the QRYSLT parameter and dropping one of the mapped field definitions as
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follows:<pre>OPNQRYF FILE(FILEA) +
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QRYSLT('%SST(CHAR6 5 2) *EQ "88" ') +
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MAPFLD((CHAR6 '%DIGITS(DATE)'))</pre>
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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="rbafodynsrsex.htm" title="These topics provide examples of selecting records using the Open Query File (OPNQRYF) command.">Select records using the Open Query File (OPNQRYF) command</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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