75 lines
4.5 KiB
HTML
75 lines
4.5 KiB
HTML
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<meta name="DC.Title" content="Error processing for UDFs" />
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<meta name="abstract" content="When an error is encountered when processing a UDF, the system follows a specified model." />
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<meta name="description" content="When an error is encountered when processing a UDF, the system follows a specified model." />
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<meta name="DC.subject" content="table function, UDFs (User-defined functions), error processing, scalar function, UDFs (User-defined functions), scalar function" />
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<title>Error processing for UDFs</title>
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</head>
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<body id="rbafyudferror"><a name="rbafyudferror"><!-- --></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">Error processing for UDFs</h1>
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<div><p>When an error is encountered when processing a UDF, the system
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follows a specified model.</p>
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<div class="section"><h4 class="sectiontitle">Table function error processing</h4><p>The error processing
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model for table function calls is as follows: </p>
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</div>
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<div class="section"> <ol><li>If FIRST call fails, no further calls are made.</li>
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<li>If FIRST call succeeds, the nested OPEN, FETCH, and CLOSE calls are made,
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and the FINAL call is always made.</li>
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<li>If OPEN call fails, no FETCH or CLOSE call is made.</li>
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<li>If OPEN call succeeds, then FETCH and CLOSE calls are made.</li>
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<li>If a FETCH call fails, no further FETCH calls are made, but the CLOSE
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call is made.</li>
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</ol>
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</div>
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<div class="section"> <div class="note"><span class="notetitle">Note:</span> This model describes the ordinary error processing for table
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UDFs. In the event of a system failure or communication problem, a call indicated
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by the error processing model may not be made. </div>
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</div>
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<div class="section"><h4 class="sectiontitle">Scalar function error processing</h4><p>The error processing
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model for scalar UDFs, which are defined with the FINAL CALL specification,
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is as follows: </p>
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</div>
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<div class="section"> <ol><li>If FIRST call fails, no further calls are made. </li>
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<li>If FIRST call succeeds, then further NORMAL calls are made as warranted
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by the processing of the statement, and a FINAL call is always made.</li>
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<li>If NORMAL call fails, no further NORMAL calls are made, but the FINAL
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call is made (if you have specified FINAL CALL). This means that if an error
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is returned on a FIRST call, the UDF must clean up before returning, because
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no FINAL call will be made. </li>
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</ol>
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</div>
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<div class="section"> <div class="note"><span class="notetitle">Note:</span> This model describes the ordinary error processing for scalar
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UDFs. In the event of a system failure or communication problem, a call indicated
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by the error processing model may not be made.</div>
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</div>
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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="rbafywudfextern.htm" title="You can write the executable code of a UDF in a language other than SQL.">Write UDFs as external functions</a></div>
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</div>
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