109 lines
6.7 KiB
HTML
109 lines
6.7 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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<!-- 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="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="GOTO statement, SQL-control-statement,
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SQL statements" />
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<title>GOTO 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="gotostmt"></a>
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<h2 id="gotostmt"><a href="rbafzmst02.htm#ToC_1440">GOTO statement</a></h2><a id="idx3352" name="idx3352"></a><a id="idx3353" name="idx3353"></a>
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<p>The GOTO statement branches to a user-defined label within an SQL function,
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SQL procedure, or SQL trigger.</p>
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<a name="wq1881"></a>
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<h3 id="wq1881"><a href="rbafzmst02.htm#ToC_1441">Syntax</a></h3>
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<a href="rbafzmstgotostmt.htm#syncgoto"><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="rbafzmstsyn416.htm"
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border="0" /></span><a href="#skipsyn-415"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a>>>-+---------+--GOTO--<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-415" id="skipsyn-415"></a>
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<a name="syncgoto"></a>
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<h3 id="syncgoto"><a href="rbafzmst02.htm#ToC_1442">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 GOTO statement. The label name
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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 labelled statement where processing is to continue. The
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labelled statement and the GOTO statement must both be in the same scope:
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<ul>
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<li>If the GOTO statement is defined in a FOR statement, <span class="italic">label</span> must be defined inside the same FOR statement, excluding a nested
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FOR statement or nested compound statement.</li>
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<li>If the GOTO statement is defined outside a FOR statement, <span class="italic">label</span> must not be defined within a FOR statement or nested compound statement.</li>
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<li>If the GOTO statement is defined in a handler, <span class="italic">label</span> must be defined inside the same handler.</li>
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<li>If the GOTO statement is defined outside a handler, <span class="italic">label</span> must not be defined within a handler.</li></ul>
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<p>If <span class="italic">label2</span> is not defined within a scope that
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the GOTO statement can reach, an error is returned.</p>
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</dd>
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</dl>
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<a name="wq1882"></a>
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<h3 id="wq1882"><a href="rbafzmst02.htm#ToC_1443">Notes</a></h3>
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<p><span class="bold">Using a GOTO statement</span>: Use the GOTO statement sparingly.
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This statement interferes with the normal sequence of processing, thus making
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a routine more difficult to read and maintain. Often, another statement, such
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as IF or LEAVE, can eliminate the need for a GOTO statement.</p>
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<a name="wq1883"></a>
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<h3 id="wq1883"><a href="rbafzmst02.htm#ToC_1444">Example</a></h3>
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<p>In the following statement, the parameters <span class="italic">rating</span> and <span class="italic">v_empno</span> are passed in to the procedure. The time in service
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is returned as a date duration in output parameter <span class="italic">return_parm</span>. If the time in service with the company is less then 6 months, the
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GOTO statement transfers control to the end of the procedure and <span class="italic">new_salary</span> is left unchanged.</p>
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<pre class="xmp"><span class="bold">CREATE PROCEDURE</span> adjust_salary
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<span class="bold">(IN</span> v_empno <span class="bold">CHAR</span>(6),
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<span class="bold">IN</span> rating <span class="bold">INTEGER</span>,
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<span class="bold">OUT</span> return_parm <span class="bold">DECIMAL</span>(8,2)<span class="bold">)</span>
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<span class="bold">LANGUAGE SQL
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MODIFIES SQL DATA</span>
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<span class="bold">BEGIN</span>
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<span class="bold">DECLARE</span> new_salary <span class="bold">DECIMAL</span>(9,2);
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<span class="bold">DECLARE</span> service <span class="bold">DECIMAL</span>(8,2);
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<span class="bold">SELECT</span> salary, <span class="bold">CURRENT_DATE</span> - hiredate
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<span class="bold">INTO</span> new_salary, service
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<span class="bold">FROM</span> employee
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<span class="bold">WHERE</span> empno = v_empno;
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<span class="bold">IF</span> service < 600
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<span class="bold">THEN GOTO</span> exit1;
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<span class="bold">END IF</span>;
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<span class="bold">IF</span> rating = 1
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<span class="bold">THEN SET</span> new_salary = new_salary + (new_salary * .10);
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<span class="bold">ELSEIF</span> rating = 2
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<span class="bold">THEN SET</span> new_salary = new_salary + (new_salary * .05);
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<span class="bold">END IF</span>;
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<span class="bold">UPDATE</span> employee
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<span class="bold">SET</span> salary = new_salary
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<span class="bold">WHERE</span> empno = v_empno;
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EXIT1: <span class="bold">SET</span> return_parm = service;
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<span class="bold">END</span>
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</pre>
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<hr /><br />
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