71 lines
4.4 KiB
HTML
71 lines
4.4 KiB
HTML
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<meta name="DC.Title" content="Example: Use LOB locators to manipulate UDT instances" />
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<meta name="abstract" content="Suppose you want to obtain information about a specific e-mail without having to transfer the entire e-mail into a host variable in your application program." />
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<meta name="description" content="Suppose you want to obtain information about a specific e-mail without having to transfer the entire e-mail into a host variable in your application program." />
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<meta name="DC.subject" content="UDTs (User-defined types), LOB locators to manipulate UDT instances example, examples, LOB locators to manipulate UDT instances, LOBs (Large Objects), LOB locators to manipulate UDT instances example" />
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<title>Example: Use LOB locators to manipulate UDT instances</title>
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</head>
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<body id="rbafyexplobl"><a name="rbafyexplobl"><!-- --></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: Use LOB locators to manipulate UDT instances</h1>
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<div><p>Suppose you want to obtain information about a specific e-mail
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without having to transfer the entire e-mail into a host variable in your
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application program.</p>
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<div class="section"><p>Remember that an e-mail can be quite large. Since your UDT is
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defined as a LOB, you can use LOB locators for that purpose:</p>
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<pre> EXEC SQL <strong>BEGIN DECLARE SECTION</strong>
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long hv_len;
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char hv_subject[200];
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char hv_sender[200];
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char hv_buf[4096];
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char hv_current_time[26];
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<strong>SQL TYPE IS</strong> BLOB_LOCATOR hv_email_locator;
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EXEC SQL <strong>END DECLARE SECTION</strong>
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EXEC SQL <strong>SELECT</strong> MESSAGE
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<strong>INTO</strong> :hv_email_locator
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<strong>FROM</strong> ELECTRONIC MAIL
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<strong>WHERE</strong> ARRIVAL_TIMESTAMP = :hv_current_time;
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EXEC SQL <strong>VALUES</strong> (SUBJECT (E_MAIL(:hv_email_locator))
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<strong>INTO</strong> :hv_subject;
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.... code that checks if the subject of the e_mail is relevant ....
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.... if the e_mail is relevant, then...............................
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EXEC SQL <strong>VALUES</strong> (SENDER (CAST (:hv_email_locator AS E_MAIL)))
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<strong>INTO</strong> :hv_sender;</pre>
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</div>
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<div class="section"><p>Because your host variable is of type BLOB locator (the source
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type of the UDT), you have explicitly converted the BLOB locator to your UDT,
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whenever it was used as an argument of a UDF defined on the UDT. </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="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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