106 lines
7.3 KiB
HTML
106 lines
7.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<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))' />
|
|
<meta name="DC.Type" content="concept" />
|
|
<meta name="DC.Title" content="DBCS field concatenation" />
|
|
<meta name="abstract" content="When fields are concatenated, the data types can change (the resulting data type is automatically determined by the system). You can follow these guidelines when double-byte character set (DBCS) fields are concatenated." />
|
|
<meta name="description" content="When fields are concatenated, the data types can change (the resulting data type is automatically determined by the system). You can follow these guidelines when double-byte character set (DBCS) fields are concatenated." />
|
|
<meta name="DC.subject" content="double-byte character set (DBCS), field, concatenating, DBCS (double-byte character set), concatenating, DBCS" />
|
|
<meta name="keywords" content="double-byte character set (DBCS), field, concatenating, DBCS (double-byte character set), concatenating, DBCS" />
|
|
<meta name="DC.Relation" scheme="URI" content="rbafoappdbcs.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rbafoqryoc.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rbafodbcscon" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>DBCS field concatenation</title>
|
|
</head>
|
|
<body id="rbafodbcscon"><a name="rbafodbcscon"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">DBCS field concatenation</h1>
|
|
<div><p>When fields are concatenated, the data types can change (the resulting
|
|
data type is automatically determined by the system). You can follow these
|
|
guidelines when double-byte character set (DBCS) fields are concatenated.</p>
|
|
<div class="p"><ul><li>The operating system assigns the data type based on the data
|
|
types of the fields that are being concatenated. When DBCS fields are included
|
|
in a concatenation, the general rules are: <ul><li>If the concatenation contains one or more hexadecimal (H) fields, the
|
|
resulting data type is hexadecimal (H).</li>
|
|
<li>If all fields in the concatenation are DBCS-only (J), the resulting data
|
|
type is DBCS-only (J).</li>
|
|
<li>If the concatenation contains one or more DBCS (O, E, J) fields, but no
|
|
hexadecimal (H) fields, the resulting data type is DBCS open (O).</li>
|
|
<li>If the concatenation contains two or more DBCS open (O) fields, the resulting
|
|
data type is a variable-length DBCS open (O) field.</li>
|
|
<li>If the concatenation contains one or more variable-length fields of any
|
|
data type, the resulting data type is variable length.</li>
|
|
<li>A DBCS-graphic (G) field can be concatenated only to another DBCS-graphic
|
|
field. The resulting data type is DBCS-graphic (G).</li>
|
|
<li>A UCS2-graphic (G) field can be concatenated to another UCS2-graphic field,
|
|
a UTF-8 character field, or a UTF-16 graphic field. The resulting data type
|
|
is UTF-16 if one of the operands is UTF-16, UTF-8 if one of the operands is
|
|
UTF-8 and no operands are UTF-16, and otherwise UCS-2.</li>
|
|
<li>A UTF-8 character (A) field can be concatenated with another UTF-8 field,
|
|
a UTF-16 field, or a UCS-2 field. The resulting data type is UTF-16 if one
|
|
of the operands is UTF-16, UTF-8 if one of the operands is UTF-8 and no operands
|
|
are UTF-16, and otherwise UCS-2.</li>
|
|
<li>A UTF-16 graphic (G) field can be concatenated with another UTF-16 field,
|
|
a UTF-8 field, or a UCS-2 field. The resulting data type is UTF-16 if one
|
|
of the operands is UTF-16, UTF-8 if one of the operands is UTF-8 and no operands
|
|
are UTF-16, and otherwise UCS-2.</li>
|
|
</ul>
|
|
</li>
|
|
<li>The maximum length of a concatenated field varies depending on the data
|
|
type of the concatenated field and length of the fields being concatenated.
|
|
If the concatenated field is zoned decimal (S), its total length cannot exceed
|
|
31 bytes. If the concatenated field is character (A), DBCS-open (O), or DBCS-only
|
|
(J), its total length cannot exceed 32,766 bytes (32,740 bytes if the field
|
|
is variable length). <p>The length of DBCS-graphic (G) fields is expressed
|
|
as the number of double-byte <em>characters</em> (the actual length is twice
|
|
the number of characters); therefore, the total length of the concatenated
|
|
field cannot exceed 16,383 characters (16,370 characters if the field is variable
|
|
length).</p>
|
|
</li>
|
|
<li>In join logical files, the fields to be concatenated must be from the
|
|
same physical file. The first field specified on the CONCAT keyword identifies
|
|
which physical file is used. The first field must, therefore, be unique among
|
|
the physical files on which the logical file is based, or you must also specify
|
|
the JREF keyword to specify which physical file to use.</li>
|
|
<li>The use of a concatenated field must be I (input only).</li>
|
|
<li>REFSHIFT cannot be specified on a concatenated field that has been assigned
|
|
a data type of O or J.</li>
|
|
</ul>
|
|
<div class="note"><span class="notetitle">Notes:</span> <ol><li>When bracketed-DBCS fields are concatenated, a shift-in at the end of
|
|
one field and a shift-out at the beginning of the next field are removed.
|
|
If the concatenation contains one or more hexadecimal fields, the shift-in
|
|
and shift-out pairs are only eliminated for DBCS fields that precede the first
|
|
hexadecimal field.</li>
|
|
<li>A concatenated field that contains DBCS fields must be an input-only field.</li>
|
|
<li>Resulting data types for concatenated DBCS fields might differ when using
|
|
The Open Query File (OPNQRYF) command.</li>
|
|
</ol>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafoappdbcs.htm" title="These topics describe double-byte character set (DBCS) considerations as they apply to the database on the iSeries system.">Double-byte character set considerations</a></div>
|
|
</div>
|
|
<div class="relconcepts"><strong>Related concepts</strong><br />
|
|
<div><a href="rbafoqryoc.htm" title="When using the Open Query File (OPNQRYF) concatenation function, the i5/OS licensed program assigns the resulting data type based on the data types of the fields being concatenated. When double-byte character set (DBCS) fields are included in a concatenation, the resulting data type is generally the same as concatenated fields in a logical file, with some slight variations.">Use concatenation with DBCS fields through the Open Query File (OPNQRYF) command</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |