122 lines
7.2 KiB
HTML
122 lines
7.2 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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<meta name="DC.Title" content="Rules for DDS keywords and parameter values" />
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<meta name="abstract" content="When you code DDS entries, follow these conventions for entering keywords and their parameters." />
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<title>Rules for DDS keywords and parameter values</title>
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</head>
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<body id="syntax"><a name="syntax"><!-- --></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">Rules for DDS keywords and parameter values</h1>
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<div><p>When you code DDS entries, follow these conventions for entering
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keywords and their parameters.</p>
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<p>The DDS coding syntax for keywords and their parameter values is similar
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to the CL syntax. The DDS syntax rules are:</p>
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<ul><li>Code all DDS entries in uppercase except for character values enclosed
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in single quotation marks and extended names enclosed in quotation marks.</li>
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<li>Code keywords on the same (or subsequent) line as the entry with which
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they are associated.</li>
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<li>Separate multiple keywords with at least one blank. Parameter values for
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keywords must be enclosed in parentheses. The initial parenthesis must immediately
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follow the keyword. For example: <pre>KEYWORD(VALUE)</pre>
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<p>This
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rule is slightly different from that in control language. When coding control
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language, the parameter values can be positional. Syntax for DDS requires
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that the keyword be specified, except when specifying either a constant or
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the parameter value for the DFT (Default) keyword.</p>
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</li>
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<li>Separate multiple parameter values for the same keyword with at least
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one blank. For example: <pre>KEYWORD(VALUEA VALUEB)</pre>
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</li>
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<li>A parameter expression consists of a set of values surrounded by left
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and right parentheses. Generally, the first value within the expression is
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a special value. The special value begins with an asterisk and must immediately
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follow the left parenthesis. One or more parameter values follow the special
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value. Separate the special value and the parameter value(s) by at least one
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blank. The last parameter value must immediately precede the right parenthesis.
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A parameter expression represents one parameter value and must be separated
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from other parameter values by at least one blank. For example: <pre>KEYWORD(VALUEA (*special-value VALUEB) VALUEC)</pre>
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</li>
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<li>Use single quotation marks to enclose character values. Numeric values
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appear without single quotation marks. See the coding examples for COMP, RANGE,
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and VALUES keywords. Character values can appear in two places in the syntax:
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<ul><li>As a parameter value for some keywords. For example, TEXT (all types
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of files) and COLHDG (database files) require character strings as text description.
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Other keywords, such as CAnn and CFnn, use character strings as text descriptions
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for response indicators.</li>
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<li>As the default value of a constant field (either with or without the DFT
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keyword) for display and printer files only. In display files, a character
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constant can also be specified for named fields. Even if you do not specify
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the DFT keyword, specifying a character constant implies the DFT keyword.</li>
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</ul>
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</li>
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<li>To specify a single quotation mark within a character string, specify
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two single quotation marks so that one single quotation mark appears in the
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output. For example: <pre>KEYWORD('Customer''s name')</pre>
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<div class="p">appears
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as <pre>Customer's name</pre>
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</div>
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</li>
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<li>Use a plus (+) or a minus (–) sign as a continuation character when a
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keyword and its parameter values do not fit on a single line. The sign must
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be the last nonblank character in the functions field. A single statement
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can be continued for a maximum of 5000 character positions. <ul><li>A <strong>minus (–) sign</strong> means that the continuation begins
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in position 45 of the next line (the first position in the functions field).</li>
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<li>A <strong>plus (+) sign</strong> means that the continuation begins with the first
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nonblank (first significant) character in the functions field on the next
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line.</li>
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</ul>
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<p>If you specify a continuation character within a parameter value,
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any blanks preceding the continuation character are included in the parameter
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value.</p>
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</li>
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<li>Specify a plus (+) sign as the last nonblank character on a line to continue
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conditioning for keywords specified on the next line. This is helpful when
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a condition includes several option indicators and applies to several keywords.</li>
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<li>The operating system continues a DDS statement until you specify one of
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the following fields: <ul><li>A record format name (R in position 17).</li>
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<li>A field specification (field name or location).</li>
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<li>For physical or logical files, a key field specification (K in position
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17).</li>
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<li>For logical files, a select or omit specification (S or O in position
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17).</li>
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<li>For join logical files, a join specification (J in position 17).</li>
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<li>For display files, a help specification (H in position 17).</li>
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<li>For device files, an option indicator or condition name that conditions
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a keyword, field, or field location.</li>
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<li>The maximum length of a DDS statement (5000 characters). The fixed length
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entries (positions 1 through 44) of the first line are included in the statement,
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so the maximum space available for keywords is 4956.</li>
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</ul>
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</li>
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</ul>
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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="coderules.htm" title="When you describe data attributes with DDS, you need to be aware of specific coding rules, naming conventions, and terminology.">DDS coding rules, conventions, and terms</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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