59 lines
3.4 KiB
HTML
59 lines
3.4 KiB
HTML
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<meta name="abstract" content="An important restriction involves both parameter markers and the NULL value." />
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<meta name="DC.subject" content="UDFs (User-defined functions), calling, parameter markers in functions, examples, parameter markers, in functions example" />
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<title>Use parameter markers or the NULL value as function arguments</title>
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</head>
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<body id="rbafyuseparameter"><a name="rbafyuseparameter"><!-- --></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 parameter markers or the NULL value as function arguments</h1>
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<div><p>An important restriction involves both parameter markers and the
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NULL value.</p>
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<div class="section"><p>You cannot code the following: </p>
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<pre> BLOOP(?)</pre>
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</div>
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<div class="section"><p>or </p>
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</div>
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<div class="example"> <pre> BLOOP(NULL)</pre>
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</div>
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<div class="section"><p>Since function resolution does not know what data type the argument
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may turn out to be, it cannot resolve the reference. You can use the CAST
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specification to provide a data type for the parameter marker or NULL value
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that function resolution can use:</p>
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<pre> BLOOP(CAST(? AS INTEGER))</pre>
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</div>
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<div class="section"><p>or </p>
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</div>
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<div class="example"> <pre> BLOOP(CAST(NULL AS INTEGER))</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="rbafyudfuudf.htm" title="Scalar and column UDFs can be called within an SQL statement almost everywhere that an expression is valid. Table UDFs can be called in the FROM clause of a SELECT. There are a few restrictions of UDF usage, however.">Use UDFs in SQL statements</a></div>
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