73 lines
4.5 KiB
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73 lines
4.5 KiB
HTML
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<title>Use indicator variables in COBOL applications that use SQL</title>
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<body id="rzajpindicatorcobol"><a name="rzajpindicatorcobol"><!-- --></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 COBOL applications that use SQL</h1>
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<div><p>An <em>indicator variable</em> is a two-byte integer
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(PIC S9(m) USAGE BINARY, where m is from 1 to 4).</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 whether its associated host variable
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has 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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and the declarations of the two can be mixed in any way that seems appropriate
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to the programmer.</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> :CLS-CD,
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:NUMDAY :NUMDAY-IND,
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:BGN :BGN-IND,
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:ENDCLS :ENDCLS-IND
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END-EXEC.</pre>
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<p>The variables can be declared as follows:</p>
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<pre> EXEC SQL <strong>BEGIN DECLARE SECTION</strong> END-EXEC.
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77 CLS-CD PIC X(7).
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77 NUMDAY PIC S9(4) BINARY.
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77 BGN PIC X(8).
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77 ENDCLS PIC X(8).
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77 NUMDAY-IND PIC S9(4) BINARY.
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77 BGN-IND PIC S9(4) BINARY.
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77 ENDCLS-IND PIC S9(4) BINARY.
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EXEC SQL <strong>END DECLARE SECTION</strong> END-EXEC.</pre>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajpcob.htm" title="This topic describes the unique application and coding requirements for embedding SQL statements in a COBOL program. Requirements for host structures and host variables are defined.">Code SQL statements in COBOL 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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