89 lines
4.8 KiB
HTML
89 lines
4.8 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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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example 2: Define fields derived from existing field definitions" />
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<meta name="abstract" content="This example shows the use of built-in functions." />
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<meta name="description" content="This example shows the use of built-in functions." />
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<meta name="DC.Relation" scheme="URI" content="rbafofdefd.htm" />
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<meta name="DC.Relation" scheme="URI" content="../rbam6/rbam6clmain.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbafofdefdex2" />
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<meta name="DC.Language" content="en-us" />
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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>Example 2: Define fields derived from existing field definitions</title>
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</head>
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<body id="rbafofdefdex2"><a name="rbafofdefdex2"><!-- --></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 2: Define fields derived from existing field definitions</h1>
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<div><p>This example shows the use of built-in functions.</p>
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<div class="section"><p>Assume that you want to calculate a mathematical
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function that is the sine of the <em>Fldm</em> field in FILEA. First create
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a file (assume it is called FILEAA) with a record format containing the following
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fields:</p>
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</div>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<table cellpadding="4" cellspacing="0" summary="" width="100%" border="0"><thead align="left"><tr><th align="left" valign="bottom" width="50%" id="d0e27">FILEA</th>
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<th align="left" valign="bottom" width="50%" id="d0e29">FILEAA</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="50%" headers="d0e27 ">Code</td>
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<td align="left" valign="top" width="50%" headers="d0e29 ">Code</td>
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</tr>
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<tr><td align="left" valign="top" width="50%" headers="d0e27 ">Fldm</td>
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<td align="left" valign="top" width="50%" headers="d0e29 ">Fldm</td>
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</tr>
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<tr><td align="left" valign="top" width="50%" headers="d0e27 "> </td>
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<td align="left" valign="top" width="50%" headers="d0e29 ">Sinm</td>
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</tr>
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</tbody>
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</table>
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</td></tr></table>
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<div class="section"><div class="p">You can then create a program (assume PGMF) using FILEAA as input
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and specify: <pre>OVRDBF FILE(FILEAA) TOFILE(FILEA) SHARE(*YES)
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OPNQRYF FILE(FILEA) FORMAT(FILEAA) +
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MAPFLD((SINM '%SIN(FLDM)'))
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CALL PGM(PGMF) /* Created using file FILEAA as input */
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CLOF OPNID(FILEA)
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DLTOVR FILE(FILEAA)</pre>
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</div>
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</div>
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<div class="section"><p>The built-in function %SIN calculates the sine of the field specified
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as its argument. Because the <em>Sinm</em> field is defined in the format specified
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on the FORMAT parameter, the Open Query File (OPNQRYF) command converts its
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internal definition of the sine value (in floating point) to the definition
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of the <em>Sinm</em> field. This technique can be used to avoid certain high-level
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language restrictions regarding the use of floating-point fields. For example,
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if you defined the <em>Sinm</em> field as a packed decimal field, PGMF can be
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written using any high-level language, even though the value was built using
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a floating-point field.</p>
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</div>
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<div class="section"><p>There are many other functions besides sine that can be used.
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See the OPNQRYF command in the Control language (CL) topic for a complete
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list of built-in functions.</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="rbafofdefd.htm" title="Listed here are the operations allowed by defining fields derived from existing field definitions.">Define fields derived from existing field definitions</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="../rbam6/rbam6clmain.htm">Control language (CL)</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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