99 lines
5.7 KiB
HTML
99 lines
5.7 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" 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 name="dc.language" scheme="rfc1766" 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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<meta name="dc.date" scheme="iso8601" content="2005-09-19" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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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="keywords" content="ITERATE statement, SQL-control-statement,
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SQL statements" />
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<title>ITERATE statement</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="iteratestmt"></a>
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<h2 id="iteratestmt"><a href="rbafzmst02.htm#ToC_1449">ITERATE statement</a></h2><a id="idx3356" name="idx3356"></a><a id="idx3357" name="idx3357"></a>
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<p>The ITERATE statement causes the flow of control to return to the beginning
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of a labelled loop.</p>
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<a name="wq1886"></a>
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<h3 id="wq1886"><a href="rbafzmst02.htm#ToC_1450">Syntax</a></h3>
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<a href="rbafzmstiteratestmt.htm#synciterate"><img src="c.gif" alt="Click to skip syntax diagram" /></a>
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<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn418.htm"
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border="0" /></span><a href="#skipsyn-417"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a>>>-+---------+--ITERATE--<span class="italic">label2</span>--------------------------------><
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'-<span class="italic">label1:</span>-'
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</pre>
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<a name="skipsyn-417" id="skipsyn-417"></a>
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<a name="synciterate"></a>
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<h3 id="synciterate"><a href="rbafzmst02.htm#ToC_1451">Description</a></h3>
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<dl class="parml">
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<dt class="bold"><span class="italic">label1</span></dt>
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<dd>Specifies the label for the ITERATE statement. The label
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name cannot be the same as another label within the same scope. For more information,
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see <a href="rbafzmstsqlprocstmt.htm#psscope">Labels</a>.
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</dd>
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<dt class="bold"><span class="italic">label2</span></dt>
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<dd>Specifies the label of the FOR, LOOP, REPEAT, or WHILE statement to
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which the database manager passes the flow of control.
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</dd>
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</dl>
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<a name="wq1887"></a>
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<h3 id="wq1887"><a href="rbafzmst02.htm#ToC_1452">Example</a></h3>
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<p>This example uses a cursor to return information for a new department.
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If the <span class="italic">not_found</span> condition handler was invoked, the
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flow of control passes out of the loop. If the value of <span class="italic">v_dept</span> is 'D11', an ITERATE statement passes the flow of control back
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to the top of the LOOP statement. Otherwise, a new row is inserted into the
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DEPARTMENT table.</p>
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<pre class="xmp"> <span class="bold">CREATE PROCEDURE</span> ITERATOR ()
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<span class="bold">LANGUAGE SQL</span>
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<span class="bold">MODIFIES SQL DATA</span>
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<span class="bold">BEGIN</span>
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<span class="bold">DECLARE</span> v_dept <span class="bold">CHAR</span>(3);
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<span class="bold">DECLARE</span> v_deptname <span class="bold">VARCHAR</span>(29);
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<span class="bold">DECLARE</span> v_admdept <span class="bold">CHAR</span>(3);
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<span class="bold">DECLARE</span> at_end <span class="bold">INTEGER DEFAULT</span> 0;
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<span class="bold">DECLARE</span> not_found <span class="bold">CONDITION FOR SQLSTATE</span> '02000';
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<span class="bold">DECLARE</span> c1 <span class="bold">CURSOR FOR</span>
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<span class="bold">SELECT</span> deptno,deptname,admrdept
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<span class="bold">FROM</span> department
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<span class="bold">ORDER BY</span> deptno;
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<span class="bold">DECLARE CONTINUE HANDLER FOR</span> not_found
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<span class="bold">SET</span> at_end = 1;
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<span class="bold">OPEN</span> c1;
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ins_loop:
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<span class="bold">LOOP</span>
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<span class="bold">FETCH</span> c1 <span class="bold">INTO</span> v_dept, v_deptname, v_admdept;
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<span class="bold">IF</span> at_end = 1 <span class="bold">THEN</span>
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<span class="bold">LEAVE</span> ins_loop;
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<span class="bold">ELSEIF</span> v_dept ='D11' <span class="bold">THEN</span>
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<span class="bold">ITERATE</span> ins_loop;
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<span class="bold">END IF</span>;
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<span class="bold">INSERT INTO</span> department (deptno,deptname,admrdept)
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<span class="bold">VALUES</span>('NEW', v_deptname, v_admdept);
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<span class="bold">END LOOP</span>;
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<span class="bold">CLOSE</span> c1;
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<span class="bold">END</span>
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</pre>
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<hr /><br />
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