94 lines
5.4 KiB
HTML
94 lines
5.4 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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Fixed-list SELECT statements" />
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<meta name="abstract" content="In dynamic SQL, fixed-list SELECT statements are those statements designed to retrieve data of a predictable number and type. When using these statements, you can anticipate and define host variables to accommodate the retrieved data so that an SQL descriptor area (SQLDA) is not necessary." />
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<meta name="description" content="In dynamic SQL, fixed-list SELECT statements are those statements designed to retrieve data of a predictable number and type. When using these statements, you can anticipate and define host variables to accommodate the retrieved data so that an SQL descriptor area (SQLDA) is not necessary." />
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<meta name="DC.subject" content="dynamic SQL, fixed-list SELECT statement, SELECT statement, using fixed-list, cursor, use in" />
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<meta name="keywords" content="dynamic SQL, fixed-list SELECT statement, SELECT statement, using fixed-list, cursor, use in" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Fixed-list SELECT statements</title>
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</head>
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<body id="rbafyfixed"><a name="rbafyfixed"><!-- --></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">Fixed-list SELECT statements</h1>
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<div><p>In dynamic SQL, fixed-list SELECT statements are those statements
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designed to retrieve data of a predictable number and type. When using these
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statements, you can anticipate and define host variables to accommodate the
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retrieved data so that an SQL descriptor area (SQLDA) is not necessary.</p>
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<div class="section"><p>Each successive FETCH returns the same number of values as the
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last, and these values have the same data formats as those returned for the
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last FETCH. You can specify host variables in the same manner as for any SQL
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application.</p>
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</div>
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<div class="section"><p>You can use fixed-list dynamic SELECT statements with any SQL-supported
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application program.</p>
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</div>
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<div class="section"><p>To run fixed-list SELECT statements dynamically, your application
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must: </p>
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</div>
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<div class="section"> <ol><li>Place the input SQL statement into a host variable.</li>
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<li>Issue a PREPARE statement to validate the dynamic SQL statement and put
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it into a form that can be run. If DLYPRP (*YES) is specified on the CRTSQLxxx
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command, the preparation is delayed until the first time the statement is
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used in an EXECUTE or DESCRIBE statement, unless the USING clause is specified
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on the PREPARE statement.</li>
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<li>Declare a cursor for the statement name.</li>
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<li>Open the cursor.</li>
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<li>FETCH a row into a fixed list of variables (rather than into a descriptor
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area, as if you were using a varying-list SELECT statement.</li>
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<li>When end of data occurs, close the cursor.</li>
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<li>Handle any SQL return codes that result.</li>
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</ol>
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</div>
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<div class="section"><p>For example: </p>
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<pre> MOVE '<strong>SELECT</strong> EMPNO, LASTNAME <strong>FROM</strong> CORPDATA.EMPLOYEE <strong>WHERE</strong> EMPNO>?'
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TO DSTRING.
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EXEC SQL
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<strong>PREPARE</strong> S2 <strong>FROM</strong> :DSTRING END-EXEC.
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EXEC SQL
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<strong>DECLARE</strong> C2 <strong>CURSOR FOR</strong> S2 END-EXEC.
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EXEC SQL
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<strong>OPEN</strong> C2 <strong>USING</strong> :EMP END-EXEC.
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PERFORM FETCH-ROW UNTIL SQLCODE NOT=0.
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EXEC SQL
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<strong>CLOSE</strong> C2 END-EXEC.
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STOP-RUN.
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FETCH-ROW.
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EXEC SQL
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<strong>FETCH</strong> C2 <strong>INTO</strong> :EMP, :EMPNAME END-EXEC.</pre>
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<div class="note"><span class="notetitle">Note:</span> <img src="./delta.gif" alt="Start of change" />Remember
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that because the SELECT statement, in this case, always returns the same number
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and type of data items as previously run fixed-list SELECT statements, you
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do not need to use an SQL descriptor area.<img src="./deltaend.gif" alt="End of change" /></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="rbafyprocesssqlda.htm" title="There are two basic types of SELECT statements: fixed list and varying list.">Process SELECT statements and use a descriptor</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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