132 lines
8.0 KiB
HTML
132 lines
8.0 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="assignment-statement, SQL-control-statement,
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SQL statements" />
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<title>assignment-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="assignstmt"></a>
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<h2 id="assignstmt"><a href="rbafzmst02.htm#ToC_1410">assignment-statement</a></h2><a id="idx3328" name="idx3328"></a><a id="idx3329" name="idx3329"></a>
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<p>The assignment-statement assigns a value to an SQL parameter or SQL variable.</p>
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<a name="wq1849"></a>
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<h3 id="wq1849"><a href="rbafzmst02.htm#ToC_1411">Syntax</a></h3>
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<a href="rbafzmstassignstmt.htm#synassignment"><img src="c.gif" alt="Click to skip syntax diagram" /></a>
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<p>
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</p>
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<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn406.htm"
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border="0" /></span><a href="#skipsyn-405"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a>>>-+--------+--SET--<span class="italic">assignment-clause</span>--------------------------><
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'-<span class="italic">label:</span>-'
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</pre>
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<a name="skipsyn-405" id="skipsyn-405"></a><p class="indatacontent">
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</p>
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<a name="wq1850"></a>
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<div class="fignone" id="wq1850">
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<p><span class="bold">assignment-clause:</span></p>
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<pre class="cgraphic"><span><img src="c.gif" alt="Read syntax diagram" longdesc="rbafzmstsyn407.htm"
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border="0" /></span><a href="#skipsyn-406"><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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>>---+-+-<span class="italic">SQL-parameter-name</span>-+-- = --+-<span class="italic">expression</span>-+-------------------------+-+-><
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| '-<span class="italic">SQL-variable-name</span>--' +-NULL-------+ |
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| '-DEFAULT----' |
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| .-,----------------------. .-,--------------. |
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| V | V | |
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'-(----+-<span class="italic">SQL-parameter-name</span>-+-+--)-- = --+-(----+-<span class="italic">expression</span>-+-+--)-+-'
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'-<span class="italic">SQL-variable-name</span>--' | +-NULL-------+ |
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| '-DEFAULT----' |
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'-<span><span class="italic">row-fullselect</span></span>-----------'
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</pre>
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<a name="skipsyn-406" id="skipsyn-406"></a></div>
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<a name="synassignment"></a>
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<h3 id="synassignment"><a href="rbafzmst02.htm#ToC_1412">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 <span class="italic">assignment-statement</span> statement. The label name cannot be the same as another label within
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the same scope. For more information, see <a href="rbafzmstsqlprocstmt.htm#psscope">Labels</a>.
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</dd>
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<dt class="bold"><span class="italic">SQL-parameter-name</span></dt>
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<dd>Identifies the SQL parameter that is the assignment target. The SQL
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parameter must be specified in <span class="italic">parameter-declaration</span> in
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the CREATE PROCEDURE or CREATE FUNCTION statement.
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</dd>
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<dt class="bold"><span class="italic">SQL-variable-name</span></dt>
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<dd>Identifies the SQL variable that is the assignment target. SQL variables
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can be defined in a compound statement or be a transition variable.
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</dd>
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<dt class="bold"><span class="italic">expression</span> <span class="base">or</span> NULL</dt>
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<dd>Specifies the expression or value that is the source for the assignment.
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</dd>
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<dt class="bold">DEFAULT</dt>
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<dd>Specifies that the default value for the column associated with the
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transition variable will be used. This can only be specified in SQL triggers
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for transition variables.
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</dd>
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<dt class="bold"><span class="italic">row-fullselect</span></dt>
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<dd>A fullselect that returns a single result row. The result column values
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are assigned to the corresponding SQL variable or parameter. If the result
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of the fullselect is no rows, then null values are assigned. An error is returned
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if there is more than one row in the result.
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</dd>
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</dl>
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<a name="wq1851"></a>
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<h3 id="wq1851"><a href="rbafzmst02.htm#ToC_1413">Notes</a></h3>
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<p><span class="bold">Assignment rules:</span> Assignments in the assignment statement
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must conform to the SQL assignment rules as described in <a href="rbafzmstch2bas.htm#ch2bas">Assignments and comparisons</a>.
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If assigning to a string variable, storage assignment rules apply.</p>
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<p><span class="bold">Assignment rules for SQL parameters:</span> An IN parameter
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can appear on the left or right side of an assignment-statement. When control
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returns to the caller, the original value of the IN parameter is retained.
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An OUT parameter can also appear on the left or right side of an assignment-statement.
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If used without first being assigned a value, the value is undefined. When
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control returns to the caller, the last value that is assigned to an OUT parameter
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is returned to the caller. For an INOUT parameter, the first value of the
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parameter is determined by the caller, and the last value that is assigned
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to the parameter is returned to the caller.</p>
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<p><span class="bold">Special Registers:</span> If a variable has been declared
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with an identifier that matches the name of a special register (such as PATH),
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then the variable must be delimited to distinguish it from assignment to the
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special register (for example, SET "PATH" = 1; for a variable called PATH
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declared as an integer).</p>
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<p><span class="bold">SQLCODE and SQLSTATE:</span> The SQLCODE and SQLSTATE will
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be reset and the diagnostic area or SQLCA initialized for each <span class="italic">assignment-statement</span> other than <span class="italic">assignment-statements</span> that:</p>
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<ul>
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<li>assign the SQLSTATE or SQLCODE variable to another variable or</li>
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<li>set a constant value into the SQLSTATE or SQLCODE variable.</li></ul>
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<a name="wq1852"></a>
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<h3 id="wq1852"><a href="rbafzmst02.htm#ToC_1414">Example</a></h3>
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<p>Increase the SQL variable p_salary by 10 percent.</p>
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<pre class="xmp"> <span class="bold">SET</span> p_salary = p_salary + (p_salary * .10)
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</pre>
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<p>Set SQL variable p_salary to the null value</p>
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<pre class="xmp"> <span class="bold">SET</span> p_salary = <span class="bold">NULL</span></pre>
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<hr /><br />
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[ <a href="#Top_Of_Page">Top of Page</a> | <a href="rbafzmstsqlprocstmt.htm">Previous Page</a> | <a href="rbafzmstcallstmt.htm">Next Page</a> | <a href="rbafzmst02.htm#wq1">Contents</a> |
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<a href="rbafzmstindex.htm#index">Index</a> ]
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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