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<h1 class="topictitle1">DBCS field definition</h1>
<div><p>Consider the characteristics of DBCS data when you define a DBCS
field.</p>
<ul><li>Each DBCS character is 2 bytes long.</li>
<li>The length of a DBCS character string is always even.</li>
<li>Shift-out (SO) and shift-in (SI) control characters are required at the
beginning and end of the DBCS character string, except for graphic-data type
fields. Together, these characters are 2 bytes long.</li>
<li>The system treats DBCS data the same as character data, and therefore
cannot perform arithmetic operations on it.</li>
<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>
<li>E (DBCS-either) for fields that can contain bracketed DBCS or SBCS data,
but not both.</li>
<li>O (DBCS-open) for fields that can contain both SBCS and bracketed DBCS
data.</li>
<li>G (DBCS-graphic) for fields that can contain graphic data without the
SO and SI control characters.</li>
</ul>
<p>Data type O is allowed in all types of files. Data types J and E are
allowed only in database and display files. Data type G is allowed in database,
display, and printer files. In most cases, the operating system automatically
inserts shift-out and shift-in characters. An exception is when data is written
into a data type G field in a database file.</p>
</li>
</ul>
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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 class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="../dds/kickoff.htm">DDS concepts</a></div>
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