71 lines
4.5 KiB
HTML
71 lines
4.5 KiB
HTML
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<meta name="DC.Title" content="Use host variables in ILE RPG applications that use SQL" />
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<meta name="abstract" content="All host variables used in SQL statements must be explicitly declared." />
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<meta name="DC.subject" content="host variable, ILE RPG, ILE RPG program, coding requirement, requirement for ILE RPG, BEGIN DECLARE SECTION statement, END DECLARE SECTION statement, : (colon), colon, in ILE RPG host variable" />
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<title>Use host variables in ILE RPG applications that use SQL</title>
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</head>
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<body id="rzajphostvariablesirpg"><a name="rzajphostvariablesirpg"><!-- --></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 host variables in ILE RPG applications that use SQL</h1>
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<div><p>All host variables used in SQL statements must be explicitly declared.</p>
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<div class="section"><p>SQL embedded in ILE RPG does not use the SQL BEGIN DECLARE SECTION
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and END DECLARE SECTION statements to identify host variables. Do not put
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these statements in the source program.</p>
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</div>
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<div class="section"><p>All host variables within an SQL statement must be preceded by
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a colon (:).</p>
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</div>
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<div class="section"><p>The names of host variables must be unique within the program,
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even if the host variables are in different procedures. However, if a data
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structure has the QUALIFIED keyword, then the subfields of that data structure
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can have the same name as a subfield in a different data structure or as a
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stand-alone variable. The subfield of a data structure with the QUALIFIED
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keyword must be referenced using the data structure name to qualify the subfield
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name. </p>
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</div>
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<div class="section"><p>An SQL statement that uses a host variable must be within the
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scope of the statement in which the variable was declared.</p>
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</div>
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<div class="section"><p>If an error stating that a host variable is not defined or not
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usable is issued, look at the cross-reference in the precompiler listing to
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see how the precompiler defined the variable. To generate a cross-reference
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in the listing, run the precompile command with *XREF specified on the OPTIONS
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parameter. </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="rzajpdeclaringirpg.htm">Declare host variables in ILE RPG applications that use SQL</a></strong><br />
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The SQL ILE RPG precompiler only recognizes a subset of valid ILE RPG declarations as valid host variable declarations.</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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