99 lines
5.7 KiB
HTML
99 lines
5.7 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 http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<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))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="ODBC language considerations" />
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<meta name="abstract" content="The ODBC Driver in iSeries Access for Linux handles many types of data conversions." />
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<meta name="description" content="The ODBC Driver in iSeries Access for Linux handles many types of data conversions." />
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<meta name="DC.Relation" scheme="URI" content="rzatvodbc.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="languageodbc" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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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>ODBC language considerations</title>
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</head>
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<body id="languageodbc"><a name="languageodbc"><!-- --></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">ODBC language considerations</h1>
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<div><p>The ODBC Driver in iSeries™ Access for Linux<sup>®</sup> handles
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many types of data conversions.</p>
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<div class="section"><p>The character code page conversions involve using conversion tables
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and the <samp class="codeph">iconv</samp> interfaces. Some of the conversion tables are
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shipped with the driver, others are downloaded from the server when needed. <samp class="codeph">iconv</samp> is
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a library shipped with Linux that also handles character data conversions.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Coded Character Set Identifiers (CCSID)</h4><p>The ODBC
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Driver in iSeries Access
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for Linux uses
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a pair (to and from) of Coded Character Set Identifiers (CCSID) to convert
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character data. The conversion uses a conversion table or the <samp class="codeph">iconv</samp> interfaces.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Conversion Tables</h4><div class="p">Conversion tables are stored in <samp class="codeph">/opt/ibm/iSeriesAccess/conv_tables</samp> and
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use the following naming convention: <pre><4 byte hex number of FROM CCSID><4 byte hex number of TO CCSID>.tbl </pre>
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</div>
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</div>
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<div class="section"><p>For example, the conversation table for 819 to 500 is <samp class="codeph">033301f4.tbl</samp>.</p>
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</div>
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<div class="section"><p>Many conversion tables are shipped with the iSeries Access
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ODBC Driver. Additional conversion tables are downloaded from the server when
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they are needed. You can also download conversion tables using the <samp class="codeph">CWBNLTBL</samp> utility. </p>
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</div>
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<div class="section"><h4 class="sectiontitle">ODBC Application Character Set</h4><p>The ODBC application
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character set is defined by the current locale's character set. To find out
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the current locale, use the following command:</p>
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<pre>locale</pre>
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</div>
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<div class="section"><p>To find out the current mapping between the current locale's character
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set and the CCSID that is used, use the following command:</p>
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<pre>/opt/ibm/iSeriesAccess/bin/cwbnltbl</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Overriding the Character Set CCSID Mappings</h4><p>To change
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or the add character set CCSID mapping, add the following lines to the $HOME/.iSeriesAccess/cwb_userprefs.ini
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configuration file.</p>
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</div>
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<div class="section"><p>[CWB_CURRUSER\Software\IBM\Client Access Express\CurrentVersion\NLS]
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CCSID-CODESET=attr_str:939,IBM939,819,IBM819</p>
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</div>
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<div class="section"><p>The above example creates mappings for CCSID 939 to character
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set "IBM939" and for CCSID 819 to character set "IBM819". </p>
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</div>
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<div class="section"><h4 class="sectiontitle">List of Available Locales</h4><p>To list the available
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locales, use the following command:</p>
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<pre>locale -a</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">List of Available Iconv Character Sets</h4><p>To list the
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available <samp class="codeph">iconv</samp> character sets, use the following command:
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</p>
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<pre> iconv -l</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">How to Investigate Conversion Problems</h4><div class="p">Most conversion
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problems are logged in the History Log. To turn on history logging, use the
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following command: <pre>/opt/ibm/iSeriesAccess/bin/cwbtrc /hl:1</pre>
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(Refer to CWBTRC for more about the trace utility.) </div>
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</div>
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<div class="section"><p>The history log output is in <samp class="codeph">$HOME/.iSeriesAccess/cwbhistory-<application
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name-"$HOME/.iSeriesAccess/cwbhistory".csv</samp>. Use either a text editor
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or a spread sheet to view the contents of the history log. </p>
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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="rzatvodbc.htm" title="For information on using Open Database Connectivity (ODBC) with iSeries Access for Linux, see the following topics.">Open Database Connectivity</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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