80 lines
4.7 KiB
HTML
80 lines
4.7 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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<meta name="DC.Title" content="Cursors and prepared statements" />
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<meta name="abstract" content="Cursors and prepared statements are scoped to the compilation unit and also to the connection." />
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<meta name="description" content="Cursors and prepared statements are scoped to the compilation unit and also to the connection." />
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<meta name="DC.subject" content="distributed unit of work, cursors, prepared statements, cursor, distributed unit of work, prepared statement, examples, cursor in DUW program" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Cursors and prepared statements</title>
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</head>
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<body id="rbafydrdacursor"><a name="rbafydrdacursor"><!-- --></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">Cursors and prepared statements</h1>
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<div><p>Cursors and prepared statements are scoped to the compilation unit
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and also to the connection. </p>
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<div class="section"><p>Scoping to the compilation unit means that a program called from
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another separately compiled program cannot use a cursor or prepared statement
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that was opened or prepared by the calling program. Scoping to the connection
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means that each connection within a program can have its own separate instance
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of a cursor or prepared statement.</p>
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</div>
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<div class="section"><p>The following distributed unit of work example shows how the same
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cursor name is opened in two different connections, resulting in two instances
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of cursor C1.</p>
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</div>
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<div class="example"> <div class="fignone"><span class="figcap">Figure 1. Example of cursors in a DUW program</span><pre> .....
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EXEC SQL <strong>DECLARE</strong> C1 <strong>CURSOR FOR</strong>
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<strong>SELECT * FROM</strong> CORPDATA.EMPLOYEE;
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/* Connect to local and open C1 */
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EXEC SQL <strong>CONNECT TO</strong> LOCALSYS;
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EXEC SQL <strong>OPEN</strong> C1;
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/* Connect to the remote system and open C1 */
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EXEC SQL <strong>CONNECT TO</strong> SYSA;
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EXEC SQL <strong>OPEN</strong> C1;
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/* Keep processing until done */
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while (NOT_DONE) {
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/* Fetch a row of data from the local system */
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EXEC SQL <strong>SET CONNECTION</strong> LOCALSYS;
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EXEC SQL <strong>FETCH</strong> C1 <strong>INTO</strong> :local_emp_struct;
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/* Fetch a row of data from the remote system */
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EXEC SQL <strong>SET CONNECTION</strong> SYSA;
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EXEC SQL <strong>FETCH</strong> C1 <strong>INTO</strong> :rmt_emp_struct;
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/* Process the data */
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.....
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}
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/* Close the cursor on the remote system */
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EXEC SQL <strong>CLOSE</strong> C1;
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/* Close the cursor on the local system */
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EXEC SQL <strong>SET CONNECTION</strong> LOCALSYS;
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EXEC SQL <strong>CLOSE</strong> C1;
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.....</pre>
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</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="rbafyduwex.htm" title="Distributed unit of work (DUW) allows access to multiple application servers within the same unit of work. Each SQL statement can access only one application server. Using distributed unit of work allows changes at multiple applications servers to be committed or rolled back within a single unit of work.">Distributed unit of work</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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