112 lines
5.5 KiB
HTML
112 lines
5.5 KiB
HTML
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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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<meta name="DC.Title" content="Example: Define the UDT and UDFs" />
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<meta name="abstract" content="Suppose you want to keep the electronic mail (e-mail) sent to your company in a table." />
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<meta name="description" content="Suppose you want to keep the electronic mail (e-mail) sent to your company in a table." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Example: Define the UDT and UDFs </title>
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</head>
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<body id="rbafydudtudf"><a name="rbafydudtudf"><!-- --></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: Define the UDT and UDFs </h1>
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<div><p>Suppose you want to keep the electronic mail (e-mail) sent to your
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company in a table.</p>
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<div class="section"><p>Ignoring any issues of privacy, you plan to write queries over
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such e-mail to find out their subject, how often your e-mail service is used
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to receive customer orders, and so on. E-mail can be quite large, and it
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has a complex internal structure (a sender, a receiver, the subject, date,
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and the e-mail content). Therefore, you decide to represent the e-mail by
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means of a UDT whose source type is a large object. You define a set of UDFs
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on your e-mail type, such as functions to extract the subject of the e-mail,
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the sender, the date, and so on. You also define functions that can perform
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searches on the content of the e-mail. You do the above using the following
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CREATE statements: </p>
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<pre> <strong>CREATE DISTINCT TYPE</strong> E_MAIL <strong>AS BLOB</strong> (1M)
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<strong>CREATE FUNCTION</strong> SUBJECT (E_MAIL)
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<strong>RETURNS VARCHAR</strong> (200)
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<strong>EXTERNAL NAME</strong> 'LIB/PGM(SUBJECT)'
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<strong>LANGUAGE C
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PARAMETER STYLE DB2SQL
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NO SQL
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DETERMINISTIC
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NO EXTERNAL ACTION</strong>
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<strong>CREATE FUNCTION</strong> SENDER (E_MAIL)
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<strong>RETURNS VARCHAR</strong> (200)
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<strong>EXTERNAL NAME</strong> 'LIB/PGM(SENDER)'
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<strong>LANGUAGE C
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PARAMETER STYLE DB2SQL
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NO SQL
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DETERMINISTIC
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NO EXTERNAL ACTION</strong>
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<strong>CREATE FUNCTION</strong> RECEIVER (E_MAIL)
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<strong>RETURNS VARCHAR</strong> (200)
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<strong>EXTERNAL NAME</strong> 'LIB/PGM(RECEIVER)'
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<strong>LANGUAGE C
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PARAMETER STYLE DB2SQL
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NO SQL
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DETERMINISTIC
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NO EXTERNAL ACTION</strong>
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<strong> CREATE FUNCTION</strong> SENDING_DATE (E_MAIL)
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<strong>RETURNS DATE CAST FROM VARCHAR</strong>(10)
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<strong>EXTERNAL NAME</strong> 'LIB/PGM(SENDING_DATE)'
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<strong>LANGUAGE C
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PARAMETER STYLE DB2SQL
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NO SQL
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DETERMINISTIC
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NO EXTERNAL ACTION</strong>
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<strong>CREATE FUNCTION</strong> CONTENTS (E_MAIL)
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<strong>RETURNS BLOB</strong> (1M)
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<strong>EXTERNAL NAME</strong> 'LIB/PGM(CONTENTS)'
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<strong>LANGUAGE C
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PARAMETER STYLE DB2SQL
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NO SQL
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DETERMINISTIC
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NO EXTERNAL ACTION</strong>
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<strong>CREATE FUNCTION</strong> CONTAINS (E_MAIL, <strong>VARCHAR</strong> (200))
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<strong>RETURNS INTEGER</strong>
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<strong>EXTERNAL NAME</strong> 'LIB/PGM(CONTAINS)'
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<strong>LANGUAGE C
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PARAMETER STYLE DB2SQL
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NO SQL
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DETERMINISTIC
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NO EXTERNAL ACTION</strong>
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<strong>CREATE TABLE</strong> ELECTRONIC_MAIL
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(ARRIVAL_TIMESTAMP <strong>TIMESTAMP</strong>,
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MESSAGE E_MAIL) </pre>
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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="rbafyexampcomplex.htm" title="The following examples show how you can use user-defined types (UDTs), user-defined functions (UDFs), and large objects (LOBs) together in complex applications.">Examples of using UDTs, UDFs, and LOBs</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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