66 lines
3.8 KiB
HTML
66 lines
3.8 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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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="DBCS field definition" />
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<meta name="abstract" content="Consider the characteristics of DBCS data when you define a DBCS field." />
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<meta name="description" content="Consider the characteristics of DBCS data when you define a DBCS field." />
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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="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>DBCS field definition</title>
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</head>
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<body id="rbagsdbcsfielddefin"><a name="rbagsdbcsfielddefin"><!-- --></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">DBCS field definition</h1>
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<div><p>Consider the characteristics of DBCS data when you define a DBCS
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field.</p>
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<ul><li>Each DBCS character is 2 bytes long.</li>
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<li>The length of a DBCS character string is always even.</li>
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<li>Shift-out (SO) and shift-in (SI) control characters are required at the
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beginning and end of the DBCS character string, except for graphic-data type
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fields. Together, these characters are 2 bytes long.</li>
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<li>The system treats DBCS data the same as character data, and therefore
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cannot perform arithmetic operations on it.</li>
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<li>The following DBCS data types can be used to identify DBCS fields: <ul><li>J (DBCS-only) for fields that can contain only bracketed DBCS data.</li>
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<li>E (DBCS-either) for fields that can contain bracketed DBCS or SBCS data,
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but not both.</li>
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<li>O (DBCS-open) for fields that can contain both SBCS and bracketed DBCS
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data.</li>
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<li>G (DBCS-graphic) for fields that can contain graphic data without the
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SO and SI control characters.</li>
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</ul>
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<p>Data type O is allowed in all types of files. Data types J and E are
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allowed only in database and display files. Data type G is allowed in database,
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display, and printer files. In most cases, the operating system automatically
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inserts shift-out and shift-in characters. An exception is when data is written
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into a data type G field in a database file.</p>
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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="rbagsenadbcs.htm" title="A DBCS file is a file that contains double-byte data or is used to process double-byte data. Other files are called alphanumeric files. You can view DBCS files on display, printer, tape, diskette, and ICF devices.">Work with DBCS data</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="../dds/kickoff.htm">DDS concepts</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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