68 lines
4.8 KiB
HTML
68 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 name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Additional field definition functions you can describe with DDS" />
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<meta name="abstract" content="You can describe additional information about the fields in the physical and logical file record formats with function keywords (positions 45 through 80 on the DDS form)." />
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<meta name="description" content="You can describe additional information about the fields in the physical and logical file record formats with function keywords (positions 45 through 80 on the DDS form)." />
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<meta name="DC.subject" content="field definition, functions, field, definition, EDTCDE (Edit Code) keyword, Edit Code (EDTCDE) keyword, EDTWRD (Edit Word) keyword, Edit Word (EDTWRD) keyword, keyword, DDS, EDTCDE (Edit Code), EDTWRD (Edit Word)" />
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<meta name="keywords" content="field definition, functions, field, definition, EDTCDE (Edit Code) keyword, Edit Code (EDTCDE) keyword, EDTWRD (Edit Word) keyword, Edit Word (EDTWRD) keyword, keyword, DDS, EDTCDE (Edit Code), EDTWRD (Edit Word)" />
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<meta name="DC.Relation" scheme="URI" content="rbafodescdds.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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<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>Additional field definition functions you can describe with DDS</title>
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</head>
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<body id="rbafodesckw"><a name="rbafodesckw"><!-- --></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">Additional field definition functions you can describe with DDS</h1>
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<div><p>You can describe additional information about the fields in the
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physical and logical file record formats with function keywords (positions
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45 through 80 on the DDS form). </p>
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<div class="p">Some of the things you can specify include: <ul><li>Validity checking keywords to verify that the field data meets your standards.
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For example, you can describe a field to have a valid range of 500 to 900.
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(This checking is done only when data is typed on a keyboard to the display.)</li>
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<li>Editing keywords to control how a field should be displayed or printed.
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For example, you can use the EDTCDE(Y) keyword to specify that a date field
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is to appear as MM/DD/YY. The EDTCDE and EDTWRD keywords can be used to control
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editing. (This editing is done only when used in a display or printer file.)</li>
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<li>Documentation,
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heading, and name control keywords to control the description and name of
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a field. For example, you can use the TEXT keyword to document a description
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of each field. This text description is included in your compiler list to
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better document the files used in your program. The TEXT and COLHDG keywords
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control text and column-heading definitions. The ALIAS keyword can be used
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to provide a more descriptive name for a field. The alias, or alternative
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name, is used in a program (if the high-level language supports alias names).</li>
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<li>Content
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and default value keywords to control the null content and default data for
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a field. The ALWNULL keyword specifies whether a null value is allowed in
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the field. If ALWNULL is used, the default value of the field is null. If
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ALWNULL is not present at the field level, the null value is not allowed,
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character and hexadecimal fields default to blanks, and numeric fields default
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to zeros, unless the DFT (default) keyword is used to specify a different
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value. </li>
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</ul>
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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="rbafodescdds.htm" title="When you describe a database file using data description specifications (DDS), you can describe information at the file, record-format, join, field, key, and select/omit levels.">Describe database files using DDS</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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