87 lines
6.2 KiB
HTML
87 lines
6.2 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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<meta name="DC.Title" content="Use external file descriptions in ILE RPG applications that use SQL" />
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<meta name="abstract" content="Field definitions for externally described files, including renaming of fields, are recognized by the SQL precompiler. The external definition form of the data structure can be used to obtain a copy of the column names to be used as host variables." />
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<meta name="description" content="Field definitions for externally described files, including renaming of fields, are recognized by the SQL precompiler. The external definition form of the data structure can be used to obtain a copy of the column names to be used as host variables." />
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<meta name="DC.subject" content="file description, external, ILE RPG, external file description, host variable, ILE RPG, ILE RPG program, external file description, externally described, /COPY statement, /COPY, ILE RPG, precompiler parameter, OPTION(*CVTDT), *CVTDT, *NOCVTDT" />
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<title>Use external file descriptions in ILE RPG applications
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that use SQL</title>
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</head>
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<body id="rzajpexternalirpg"><a name="rzajpexternalirpg"><!-- --></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">Use external file descriptions in ILE RPG applications
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that use SQL</h1>
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<div><p>Field definitions for externally described files, including renaming
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of fields, are recognized by the SQL precompiler. The external definition
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form of the data structure can be used to obtain a copy of the column names
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to be used as host variables.</p>
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<div class="section"><p>How date and time field definition are retrieved and processed
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by the SQL precompiler depends on whether *NOCVTDT or *CVTDT is specified
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on the OPTION parameter of the CRTSQLRPGI command. If *NOCVTDT is specified,
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then date and time field definitions are retrieved including the format and
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separator. If *CVTDT is specified, then the format and separator is ignored
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when date and time field definitions are retrieved, and the precompiler assumes
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that the variable declarations are date/time host variables in character format.
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*CVTDT is a compatibility option for the ILE RPG precompiler.</p>
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</div>
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<div class="section"><p>If the GRAPHIC or VARGRAPHIC column has a UCS-2 CCSID, the generated
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host variable will have the UCS-2 CCSID assigned to it. If the GRAPHIC or
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VARGRAPHIC column has a UTF-16 CCSID, the generated host variable will have
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the UTF-16 CCSID assigned to it.</p>
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</div>
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<div class="section"><p>In the following example, the sample table DEPARTMENT is used
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as a file in an ILE RPG program. The SQL precompiler retrieves the field (column)
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definitions for DEPARTMENT for use as host variables.</p>
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<pre>FDEPARTMENTIP E DISK RENAME(ORIGREC:DEPTREC)
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</pre>
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</div>
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<div class="section"> <div class="note"><span class="notetitle">Note:</span> Code an F-spec for a file in your ILE RPG program only if
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you use ILE RPG statements to do I/O operations to the file. If you use only
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SQL statements to do I/O operations to the file, you can include the external
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definition of the file (table) by using an external data structure.</div>
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</div>
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<div class="section"><p>In the following example, the sample table is specified as an
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external data structure. The SQL precompiler retrieves the field (column)
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definitions as subfields of the data structure. Subfield names can be used
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as host variable names, and the data structure name TDEPT can be used as a
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host structure name. The example shows that the field names can be renamed
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if required by the program.</p>
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<pre>DTDEPT E DS EXTNAME(DEPARTMENT)
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D DEPTN E EXTFLD(DEPTNAME)
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D ADMRD E EXTFLD(ADMRDEPT)</pre>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzajpirpgexternal.htm">External file description considerations for host structure arrays in ILE RPG applications that use SQL</a></strong><br />
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For device files, if INDARA was not specified and the file contains indicators, the declaration is not used as a host structure array. The indicator area is included in the structure that is generated and would cause the storage to be separated.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajprpgi.htm" title="This topic describes the unique application and coding requirements for embedding SQL statements in an ILE RPG program. The coding requirements for host variables are defined.">Code SQL statements in ILE RPG applications</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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