71 lines
4.0 KiB
HTML
71 lines
4.0 KiB
HTML
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<title>Use indicator variables in C and C++ applications that
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use SQL</title>
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</head>
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<body id="rzajpindvard"><a name="rzajpindvard"><!-- --></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 indicator variables in C and C++ applications that
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use SQL</h1>
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<div><p>An indicator variable is a two-byte integer (short int). </p>
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<div class="section"><p>You can also specify an indicator structure (defined as an array
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of halfword integer variables) to support a host structure. On retrieval,
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an indicator variable is used to show if its associated host variable has
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been assigned a null value. On assignment to a column, a negative indicator
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variable is used to indicate that a null value should be assigned.</p>
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</div>
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<div class="section"><p>Indicator variables are declared in the same way as host variables.
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The declarations of the two can be mixed in any way that seems appropriate
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to you.</p>
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</div>
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<div class="section"><h4 class="sectiontitle"><em>Example</em></h4><p>Given the statement:</p>
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<pre> EXEC SQL <strong>FETCH</strong> CLS_CURSOR <strong>INTO</strong> :ClsCd,
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:Day :DayInd,
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:Bgn :BgnInd,
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:End :EndInd;</pre>
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<p>Variables can
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be declared as follows:</p>
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<pre> EXEC SQL <strong>BEGIN DECLARE SECTION</strong>;
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char ClsCd[8];
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char Bgn[9];
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char End[9];
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short Day, DayInd, BgnInd, EndInd;
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EXEC SQL <strong>END DECLARE SECTION</strong>;</pre>
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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="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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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../db2/rbafzmstch2refvar.htm">References to variables</a></div>
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