79 lines
5.0 KiB
HTML
79 lines
5.0 KiB
HTML
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<meta name="abstract" content="All host variables used in SQL statements must be explicitly declared prior to their first use." />
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<title>Use host variables in C and C++ applications that use
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SQL</title>
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<body id="rzajphostsqlc"><a name="rzajphostsqlc"><!-- --></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 C and C++ applications that use
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SQL</h1>
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<div><p>All host variables used in SQL statements must be explicitly declared
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prior to their first use.</p>
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<div class="section"><p>In C, the C statements that are used to define the host variables
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should be preceded by a BEGIN DECLARE SECTION statement and followed by an
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END DECLARE SECTION statement. If a BEGIN DECLARE SECTION and END DECLARE
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SECTION are specified, all host variable declarations used in SQL statements
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must be between the BEGIN DECLARE SECTION and the END DECLARE SECTION statements.
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Host variables declared using a typedef identifier also require a BEGIN DECLARE
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SECTION and END DECLARE SECTION; however, the typedef declarations do not
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need to be between these two sections.</p>
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</div>
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<div class="section"><p>In C++, the C++ statements that are used to define the host variables
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must be preceded by a BEGIN DECLARE SECTION statement and followed by an END
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DECLARE SECTION statement. You cannot use any variable that is not between
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the BEGIN DECLARE SECTION statement and the END DECLARE SECTION statement
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as a host variable.</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 blocks or procedures.</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>Host variables cannot be union elements.</p>
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</div>
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<div class="section"><p>Host variables cannot contain continuation characters within the
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name.</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="rzajpdeclaringhostc.htm">Declare host variables in C and C++ applications that use SQL</a></strong><br />
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The C and C++ precompilers recognize only a subset of valid C and C++ 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="rzajpc.htm" title="This topic describes the unique application and coding requirements for embedding SQL statements in a C or C++ program.">Code SQL statements in C and C++ applications</a></div>
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