106 lines
7.6 KiB
HTML
106 lines
7.6 KiB
HTML
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<meta name="DC.Title" content="Recommendations and guidelines for using CCSIDs" />
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<meta name="abstract" content="These recommendations are useful when writing globalized applications." />
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<title>Recommendations and guidelines for using CCSIDs</title>
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<body id="rbagsccsidgenrecom"><a name="rbagsccsidgenrecom"><!-- --></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">Recommendations and guidelines for using CCSIDs</h1>
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<div><p>These recommendations are useful when writing globalized applications.</p>
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<ul><li>Because the system is included with a default CCSID of 65535, character
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data conversions do not normally occur in applications. You should look over
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the CCSID information in this topic, however, because the system might need
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to participate in a multilingual environment, a network, or exchanging data
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at a later time.</li>
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<li>Applications implementing their own mapping scheme should use CCSID 65535,
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where a CCSID assignment is necessary. For example, depending on what an application
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does, it might need to use CCSID 65535 for the files, or it might need to
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use CCSID 65535 for the jobs. Because other applications may require CCSIDs
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other than 65535, consider changing such applications by replacing the mapping
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scheme with CCSID support.</li>
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<li>Correctly define fields based on their usage. If fields contain application-dependent
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values (for example, control characters or fields that are not used as real
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character fields), define the fields as hexadecimal data or character fields
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with CCSID 65535.</li>
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<li>Avoid using characters that are not in the invariant character set for
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names and literals in programs.</li>
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</ul>
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<p>Follow these guidelines when using CCSIDs:</p>
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<ul><li>Use CCSIDs in multilingual applications to maintain character integrity
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in database files, displays, and printed data.</li>
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<li>You can find a suggested CCSID for a language in Language identifiers
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and associated default CCSIDs.</li>
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<li>If the QIGC system value is set on, set QCCSID as a mixed CCSID or 65535.
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For more information about QIGC, see DBCS system indicator (QIGC) system value.</li>
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<li>If you use DBCS support, set the job CCSID to a mixed CCSID. If you do
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not, set the job CCSID to a single-byte CCSID.</li>
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<li>Ensure that the QCHRID code page is compatible with the character set
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and code page of the QCCSID value, unless the QCCSID value is 65535. If the
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QCCSID value is changed to a value that is incompatible with the current QCHRID
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value, the QCHRID value is changed to a compatible value by the system.</li>
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<li>If you use a user-defined data stream (UDDS), remove any X'3F' values
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inserted by CCSID conversions. Otherwise, your data can cause the system to
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blank out a screen. Some CCSID conversions use a X'3F' value for a substitution
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character.</li>
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<li>If you are using any interactive jobs, such as Application Development
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ToolSet/400, ensure that the code page of the job CCSID matches the code page
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of the keyboard type. If these CCSID values do not match, or the job CCSID
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is 65535, unpredictable results might occur. For more information, see National
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language keyboard types and SBCS code pages.</li>
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<li>Be aware that the *JOBCCSID support is not used by any system-supplied
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displays or panel groups, although CHRIDCTL support is used.</li>
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<li>Be aware of character data that has been defined or specified as control
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information. For new database files, fields that contain control information
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should be defined as hexadecimal data type or use CCSID 65535 instead of another
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CCSID.</li>
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<li>Because of workstation hardware restrictions, you might not see all of
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the characters on displays other than 3486, 3487, 3488, or Personal System/2
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(PS/2<sup>®</sup>)
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displays when CCSID conversion occurs. However, the character data is retained
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in the system.</li>
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<li>Be aware that when a CCSID conversion is performed, substitution characters
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might cause a loss of data. The situation occurs if enforced
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subset match conversion is performed (see Conversion of character data).</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="rbagscdra.htm" title="Using the server implementation of CDRA, you can achieve consistent representation, processing, and interchange of coded characters (data) on i5/OS and across IBM systems. The primary implementation of CDRA on i5/OS is through coded character set identifier (CCSID) support.">Work with CCSIDs</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="rbagsobjlev65534and65535.htm" title="CCSID 65535 is the default object-level CCSID for message files and message queues.">Object-level coded character set identifier 65535</a></div>
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<div><a href="rbagslngidsdefaultccsids.htm" title="This table shows the language identifiers and the job default CCSID (DFTCCSID) values associated with those identifiers.">Language identifiers and associated default CCSIDs</a></div>
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<div><a href="rbagsqicsuse.htm" title="The DBCS system indicator (QIGC) is used to specify whether a double-byte character set (DBCS) national language version is installed. This value is set when the primary national language version is installed.">DBCS system indicator (QIGC) system value</a></div>
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<div><a href="rbagsnatlangkeybrdtype.htm" title="This table lists the keyboard types and code pages for each national language supported by the system. The Create Device Display (CRTDEVDSP) command uses the KBDTYPE parameter.">National language keyboard types and SBCS code pages</a></div>
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<div><a href="rbagschardataconvers.htm" title="The Character Data Representation Architecture (CDRA) system of tags ensures that you can convert character data in a predictable, repeatable way.">Conversion of character data</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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