97 lines
6.5 KiB
HTML
97 lines
6.5 KiB
HTML
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<meta name="DC.Title" content="Use external file descriptions in RPG/400 applications that use SQL" />
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<meta name="abstract" content="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." />
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<meta name="description" content="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." />
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<meta name="DC.subject" content="file description, external, RPG/400, external file description, host variable, RPG/400 program, host variable, externally described, /COPY statement, /COPY, command, Override Database File (OVRDBF), used with RPG/400 /COPY, command (CL), Override Database File (OVRDBF), OVRDBF (Override Database File)" />
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<meta name="keywords" content="file description, external, RPG/400, external file description, host variable, RPG/400 program, host variable, externally described, /COPY statement, /COPY, command, Override Database File (OVRDBF), used with RPG/400 /COPY, command (CL), Override Database File (OVRDBF), OVRDBF (Override Database File)" />
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<title>Use external file descriptions in RPG/400 applications that use SQL</title>
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</head>
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<body id="rzajpexternalfilerpg"><a name="rzajpexternalfilerpg"><!-- --></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 RPG/400 applications that use SQL</h1>
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<div><p>The SQL precompiler processes the RPG/400<sup>®</sup> source in much the same manner
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as the ILE RPG compiler. This means that the precompiler processes the /COPY
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statement for definitions of host variables.</p>
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<div class="section"><p>Field definitions for externally described files are obtained
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and renamed, if different names are specified. The external definition form
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of the data structure can be used to obtain a copy of the column names to
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be used as host variables.</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 RPG/400 program.
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The SQL precompiler retrieves the field (column) definitions for DEPARTMENT
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for use as host variables.</p>
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<pre>*...1....+....2....+....3....+....4....+....5....+....6....+....7....*
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FTDEPT IP E DISK
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F TDEPT KRENAMEDEPTREC
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IDEPTREC
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I DEPTNAME DEPTN
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I ADMRDEPT ADMRD</pre>
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<div class="note"><span class="notetitle">Note:</span> Code
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an F-spec for a file in your RPG program only if you use RPG/400 statements
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to do I/O operations to the file. If you use only SQL statements to do I/O
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operations to the file, you can include the external definition by using an
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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 field names must be changed because they are greater
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than six characters.</p>
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<pre>*...1....+....2....+....3....+....4....+....5....+....6....+....7....*
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ITDEPT E DSDEPARTMENT
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I DEPTNAME DEPTN
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I ADMRDEPT ADMRD</pre>
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<div class="note"><span class="notetitle">Note:</span> DATE,
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TIME, and TIMESTAMP columns will generate host variable definitions which
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are treated by SQL with the same comparison and assignment rules as a DATE,
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TIME, and TIMESTAMP column. For example, a date host variable can only be
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compared against a DATE column or a character string which is a valid representation
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of a date.</div>
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</div>
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<div class="section"><p>Although varying-length columns generate fixed-length character-host
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variable definitions, to SQL they are varying-length character variables.</p>
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</div>
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<div class="section"><p>Although GRAPHIC and VARGRAPHIC columns are mapped to character
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variables in RPG/400,
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SQL considers these GRAPHIC and VARGRAPHIC variables. If the GRAPHIC or VARGRAPHIC
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column has a UCS-2 CCSID, the generated host variable will have the UCS-2
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CCSID assigned to it. If the GRAPHIC or VARGRAPHIC column has a UTF-16 CCSID,
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the generated host variable will have the UTF-16 CCSID assigned to it.</p>
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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="rzajpexfiledesrpg.htm">External file description considerations for host structure arrays in RPG/400 applications that use SQL</a></strong><br />
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Field definitions for externally described files, including renaming of fields, are recognized by the SQL precompiler.</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="rzajprpg.htm" title="The RPG/400 licensed program supports both RPG II and RPG III programs.">Code SQL statements in RPG/400 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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