99 lines
5.8 KiB
HTML
99 lines
5.8 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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<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="keywords" content="REPEAT statement, SQL-control-statement,
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SQL statements" />
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<title>REPEAT 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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<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="repeatstmt"></a>
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<h2 id="repeatstmt"><a href="rbafzmst02.htm#ToC_1462">REPEAT statement</a></h2><a id="idx3362" name="idx3362"></a><a id="idx3363" name="idx3363"></a>
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<p>The REPEAT statement executes a statement or group of statements until
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a search condition is true.</p>
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<a name="wq1893"></a>
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<h3 id="wq1893"><a href="rbafzmst02.htm#ToC_1463">Syntax</a></h3>
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<a href="rbafzmstrepeatstmt.htm#syncrepeat"><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="rbafzmstsyn421.htm"
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border="0" /></span><a href="#skipsyn-420"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a> .-----------------------------.
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V |
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>>-+--------+--REPEAT----<span class="italic">SQL-procedure-statement</span>-- ;-+---------->
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'-<span class="italic">label:</span>-'
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>--UNTIL--<span class="italic">search-condition</span>--END REPEAT--+-------+--------------><
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'-<span class="italic">label</span>-'
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</pre>
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<a name="skipsyn-420" id="skipsyn-420"></a>
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<a name="syncrepeat"></a>
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<h3 id="syncrepeat"><a href="rbafzmst02.htm#ToC_1464">Description</a></h3>
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<dl class="parml">
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<dt class="bold"><span class="italic">label</span></dt>
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<dd>Specifies the label for the REPEAT statement. If the ending
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label is specified, it must be the same as the beginning label. 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">SQL-procedure-statement</span></dt>
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<dd>Specifies an SQL statement to be executed in the REPEAT loop.
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</dd>
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<dt class="bold"><span class="italic">search-condition</span></dt>
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<dd>The <span class="italic">search-condition</span> is evaluated after each
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execution of the REPEAT loop. If the condition is true, the REPEAT loop will
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exit. If the condition is unknown or false, the looping continues.
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</dd>
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</dl>
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<a name="wq1894"></a>
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<h3 id="wq1894"><a href="rbafzmst02.htm#ToC_1465">Example</a></h3>
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<p>A REPEAT statement fetches rows from a table until the <span class="italic">not_found</span> condition handler is invoked.</p>
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<pre class="xmp"> <span class="bold">CREATE PROCEDURE</span> REPEAT_STMT <span class="bold">(OUT</span> COUNTER <span class="bold">INTEGER)</span>
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<span class="bold">LANGUAGE SQL</span>
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<span class="bold">BEGIN</span>
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<span class="bold">DECLARE</span> v_counter <span class="bold">INTEGER DEFAULT </span>0;
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<span class="bold">DECLARE</span> v_firstnme <span class="bold">VARCHAR(</span>12<span class="bold">)</span>;
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<span class="bold">DECLARE</span> v_midinit <span class="bold">CHAR(</span>1<span class="bold">)</span>;
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<span class="bold">DECLARE</span> v_lastname <span class="bold">VARCHAR(</span>15<span class="bold">)</span>;
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<span class="bold">DECLARE</span> at_end <span class="bold">SMALLINT 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> firstnme, midinit, lastname
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<span class="bold">FROM</span> employee;
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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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fetch_loop:
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<span class="bold">REPEAT</span>
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<span class="bold">FETCH</span> c1 <span class="bold">INTO</span> v_firstnme, v_midinit, v_lastname;
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<span class="bold">SET</span> v_counter = v_counter + 1;
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<span class="bold">UNTIL</span> at_end > 0
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<span class="bold">END REPEAT</span> fetch_loop;
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<span class="bold">SET</span> counter = v_counter;
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<span class="bold">CLOSE</span> c1;
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<span class="bold">END</span></pre>
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<hr /><br />
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