127 lines
8.3 KiB
HTML
127 lines
8.3 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 name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Database management" />
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<meta name="abstract" content="Database management support provides default coded character set identifier (CCSID) values for database files on the server. All database files are assigned a CCSID. At file creation time, the CCSID is either explicitly assigned through DDS, SQL, or IDDU, or it is implicitly assigned the job default CCSID (DFTCCSID)." />
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<meta name="description" content="Database management support provides default coded character set identifier (CCSID) values for database files on the server. All database files are assigned a CCSID. At file creation time, the CCSID is either explicitly assigned through DDS, SQL, or IDDU, or it is implicitly assigned the job default CCSID (DFTCCSID)." />
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<meta name="DC.Relation" scheme="URI" content="rbagsccsidsyssupport.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/dspfd.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbagslingandcultjobattrib.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbagslngidsdefaultccsids.htm" />
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<meta name="DC.Relation" scheme="URI" content="../cl/dspffd.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbagslingandcultjobattrib.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbagslngidsdefaultccsids.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbagsjobdefaultccsid.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbagsdataman" />
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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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<!-- 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>Database management</title>
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</head>
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<body id="rbagsdataman"><a name="rbagsdataman"><!-- --></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">Database management</h1>
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<div><p>Database management support provides default coded character set
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identifier (CCSID) values for database files on the server. All database files
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are assigned a CCSID. At file creation time, the CCSID is either explicitly
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assigned through DDS, SQL, or IDDU, or it is implicitly assigned the job default
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CCSID (DFTCCSID).</p>
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<div class="section" id="rbagsdataman__HDRDBFILESSUPPORTFORCCSID"><a name="rbagsdataman__HDRDBFILESSUPPORTFORCCSID"><!-- --></a><h4 class="sectiontitle">Database files support for
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CCSIDs</h4><p>IBM<sup>®</sup> system files and licensed program database files
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are created with the CCSID of choice for each of the national language versions.
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Only the customer files are automatically assigned the CCSID of the job creating
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the file. You can use the Display File Description (DSPFD) command to view
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the CCSID of a file.</p>
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<p>Program-described files are assigned
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CCSID 65535. If a CCSID is not explicitly specified on the CRTPF or CRTSRCPF
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command, database source files default to the job default CCSID at file creation.</p>
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<p>If
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a database logical file is defined over several physical files, it is assigned
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a CCSID at the field level and assumes the CCSID value of the physical file.
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Logical files cannot be explicitly assigned a CCSID value.</p>
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</div>
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<div class="section" id="rbagsdataman__HDRDBFIELDSCCSIDSUPPORT"><a name="rbagsdataman__HDRDBFIELDSCCSIDSUPPORT"><!-- --></a><h4 class="sectiontitle">Database fields and support for
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CCSIDs</h4><p>Except for numeric database fields, database fields are supported
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by CCSIDs. You can use the Display File Field Description (DSPFFD) command
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to view the CCSID of the fields in a file.</p>
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<p>Hexadecimal fields are assigned
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CCSID 65535.</p>
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<p>An implicit CCSID value is assigned to the following fields
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if a CCSID was not explicitly assigned through DDS, SQL, or IDDU at file creation:</p>
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<ul><li>Physical-file character</li>
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<li>DBCS-open</li>
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<li>DBCS-only</li>
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<li>DBCS-either</li>
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<li>Graphic</li>
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</ul>
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<p>The implicitly assigned CCSID is the job default CCSID, or a CCSID
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associated with the job default CCSID.</p>
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<ul><li>A character field is assigned the single-byte character set (SBCS) CCSID
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that is associated with the job default CCSID.</li>
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<li>A DBCS-open, DBCS-only, and DBCS-either field is assigned the mixed byte
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CCSID.</li>
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<li>A Graphic field is assigned the double-byte character set (DBCS) CCSID
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that is associated with the job default CCSID.</li>
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</ul>
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<p>For example, if the job default CCSID is 5026 (which
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is a CCSID that identifies mixed data), an SBCS character field is assigned
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the SBCS CCSID associated with 5026. Thus, the CCSID for that field is 290.
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If there is no CCSID of the required character set type then a CCSID of 65535
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is used. See Job Default Coded Character Set Identifier (DFTCCSID) for more
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information about job default CCSIDs. See Language identifiers and associated
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default CCSIDS for a list of language identifiers and the DFTCCSID valued
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associated with those identifiers.</p>
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<p>Database logical-file fields are
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assigned a CCSID value based on their data type and the data type of the underlying
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physical file field.</p>
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</div>
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<div class="section" id="rbagsdataman__HDRDBMANANDCONVSUPPORT"><a name="rbagsdataman__HDRDBMANANDCONVSUPPORT"><!-- --></a><h4 class="sectiontitle">Database management and conversion
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support for CCSIDs</h4><p>Database management support converts non-graphic
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character data read from, or written to, database files using the file CCSID
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and the job CCSID.</p>
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<ul><li>If data is being read from a database file and the CCSID of the file is
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the same as the job CCSID, no conversion is done.</li>
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<li>If data is being read from a database file and the CCSID of the file and
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the job CCSID are different, the data is converted to the CCSID of the job.</li>
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<li>If data is being written to a database file and the CCSID of the file
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is the same as the job CCSID, no conversion is done.</li>
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<li>If data is being written to a database file and the CCSID of the file
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and the job CCSID are different, the data is converted to match the CCSID
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of the file.</li>
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</ul>
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<p>No conversion is performed if either the CCSID of the job or the CCSID
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of the database file is equal to 65535.</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="rbagsccsidsyssupport.htm" title="The server provides support for CCSIDs in the functions as shown in the table.">i5/OS function support for 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="rbagslingandcultjobattrib.htm" title="Job attributes are set at the time a job starts.">Job attributes</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>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rbagsjobdefaultccsid.htm" title="A job attribute, job default CCSID (DFTCCSID), is created for jobs with a CCSID of 65535. The DFTCCSID value is used by a system code when a CCSID other than 65535 is needed.">Job default coded character set identifier</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../cl/dspfd.htm">Display File Description (DSPFD) command</a></div>
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<div><a href="../cl/dspffd.htm">Display File Field Description (DSPFFD) command</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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