74 lines
3.9 KiB
HTML
74 lines
3.9 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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="External file description considerations for host structure arrays in RPG/400 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." />
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<meta name="description" content="Field definitions for externally described files, including renaming of fields, are recognized by the SQL precompiler." />
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<meta name="DC.subject" content="external file description, host structure arrays, RPG/400, file description" />
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<meta name="keywords" content="external file description, host structure arrays, RPG/400, file description" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>External file description considerations for host structure arrays
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in RPG/400 applications
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that use SQL</title>
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</head>
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<body id="rzajpexfiledesrpg"><a name="rzajpexfiledesrpg"><!-- --></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">External file description considerations for host structure arrays
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in RPG/400 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.</p>
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<div class="section"><p>The external definition form of the data structure can be used
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to obtain a copy of the column names to be used as host variables.</p>
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</div>
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<div class="section"><p>In the following example, the DEPARTMENT table is included in
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the RPG/400<sup>®</sup> program
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and is used to declare a host structure array. A multiple-row FETCH statement
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is then used to retrieve 10 rows into the host structure array.</p>
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<pre>
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*...1....+....2....+....3....+....4....+....5....+....6....*
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ITDEPT E DSDEPARTMENT 10
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I DEPARTMENT DEPTN
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I ADMRDEPT ADMRD
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…
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C/EXEC SQL
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C+ <strong>DECLARE</strong> C1 <strong>CURSOR FOR</strong>
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C+ <strong>SELECT</strong> *
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C+ <strong>FROM</strong> CORPDATA.DEPARTMENT
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C/END-EXEC
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…
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C/EXEC SQL
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C+ <strong>FETCH</strong> C1 <strong>FOR</strong> 10 <strong>ROWS INTO</strong> :TDEPT
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C/END-EXEC
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</pre>
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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="rzajpexternalfilerpg.htm" title="The SQL precompiler processes the RPG/400 source in much the same manner as the ILE RPG compiler. This means that the precompiler processes the /COPY statement for definitions of host variables.">Use external file descriptions in RPG/400 applications that use SQL</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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