67 lines
4.4 KiB
HTML
67 lines
4.4 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: String search over UDT" />
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<meta name="abstract" content="Assume that you are satisfied with the FINDSTRING functions from the BLOB string search, but now you have defined a distinct type BOAT with source type BLOB." />
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<meta name="description" content="Assume that you are satisfied with the FINDSTRING functions from the BLOB string search, but now you have defined a distinct type BOAT with source type BLOB." />
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<meta name="DC.subject" content="examples, string search over UDT, CREATE FUNCTION statement, search string over UDT example" />
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<meta name="keywords" content="examples, string search over UDT, CREATE FUNCTION statement, search string over UDT example" />
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<meta name="DC.Relation" scheme="URI" content="rbafyudfdudf.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbafyudfcfxa.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: String search over UDT</title>
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</head>
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<body id="rbafyudfcfx3"><a name="rbafyudfcfx3"><!-- --></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">Example: String search over UDT</h1>
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<div><p>Assume that you are satisfied with the FINDSTRING functions from
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the BLOB string search, but now you have defined a distinct type BOAT with
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source type BLOB. </p>
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<div class="section"><p>You also want FINDSTRING to operate on values having data type
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BOAT, so you create another FINDSTRING function. This function is sourced
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on the FINDSTRING which operates on BLOB values. Note the further overloading
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of FINDSTRING in this example:</p>
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<pre> <strong>CREATE FUNCTION</strong> FINDSTRING (BOAT, <strong>VARCHAR</strong>(200))
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<strong>RETURNS INT</strong>
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<strong>SPECIFIC</strong> "slick_fboat"
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<strong>SOURCE SPECIFIC</strong> FINDSTRING_BLOB</pre>
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</div>
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<div class="section"><p>Note that this FINDSTRING function has a different signature from
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the FINDSTRING functions in <a href="rbafyudfcfxa.htm#rbafyudfcfxa">Example: BLOB string search</a>,
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so there is no problem overloading the name. Because you are using the SOURCE
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clause, you cannot use the EXTERNAL NAME clause or any of the related keywords
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specifying function attributes. These attributes are taken from the source
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function. Finally, observe that in identifying the source function you are
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using the specific function name explicitly provided in <a href="rbafyudfcfxa.htm#rbafyudfcfxa">Example: BLOB string search</a>.
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Because this is an unqualified reference, the schema in which this source
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function resides must be in the function path, or the reference will not be
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resolved. </p>
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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="rbafyudfdudf.htm" title="A UDF must be registered in the database before the function can be recognized and used by SQL.">Register UDFs</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="rbafyudfcfxa.htm" title="In this example, you want the FINDSTRING function to work on BLOBs as well as on CLOBs. To do this, you define another FINDSTRING taking BLOB as the first parameter:">Example: BLOB string search</a></div>
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</div>
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</div>
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</body>
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</html>
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