176 lines
8.9 KiB
HTML
176 lines
8.9 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="keywords" content="EXECUTE IMMEDIATE statement, EXECUTE IMMEDIATE,
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SQL statements, execution, dynamic SQL, IMMEDIATE, variable, indicator,
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in EXECUTE IMMEDIATE statement, string-expression, statement string" />
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<title>EXECUTE IMMEDIATE</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="exim"></a>
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<h2 id="exim"><a href="rbafzmst02.htm#ToC_1064">EXECUTE IMMEDIATE</a></h2><a id="idx2561" name="idx2561"></a><a id="idx2562" name="idx2562"></a><a id="idx2563" name="idx2563"></a><a id="idx2564" name="idx2564"></a>
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<a name="exeqi"></a>
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<p id="exeqi">The EXECUTE IMMEDIATE statement: </p>
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<ul>
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<li>Prepares an executable form of an SQL statement from a character string
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form of the statement</li>
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<li>Executes the SQL statement</li></ul>
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<p>EXECUTE IMMEDIATE combines the basic functions of the PREPARE and EXECUTE
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statements. It can be used to prepare and execute SQL statements that contain
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neither variables nor parameter markers.</p>
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<a name="wq1491"></a>
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<h3 id="wq1491"><a href="rbafzmst02.htm#ToC_1065">Invocation</a></h3>
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<p>This statement can only be embedded in an application program,
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SQL function, SQL procedure, or trigger. It is an executable statement that
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cannot be dynamically prepared. It must not be specified in Java™.</p>
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<a name="wq1492"></a>
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<h3 id="wq1492"><a href="rbafzmst02.htm#ToC_1066">Authorization</a></h3>
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<p>The authorization rules are those defined for the SQL statement specified
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by EXECUTE IMMEDIATE. For example, see <a href="rbafzmstbackup.htm#backup">INSERT</a> for the authorization
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rules that apply when an INSERT statement is executed using EXECUTE IMMEDIATE.</p>
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<p>The authorization ID of the statement is the run-time authorization ID
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unless DYNUSRPRF(*OWNER) was specified on the CRTSQLxxx command when the program
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was created. For more information, see <a href="rbafzmstch2auth.htm#ch2auth">Authorization IDs and authorization names</a>.</p>
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<a name="wq1493"></a>
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<h3 id="wq1493"><a href="rbafzmst02.htm#ToC_1067">Syntax</a></h3>
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<a href="rbafzmstexim.htm#synsexeimm"><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="rbafzmstsyn339.htm"
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border="0" /></span><a href="#skipsyn-338"><img src="c.gif" alt="Skip visual syntax diagram"
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border="0" /></a>>>-EXECUTE IMMEDIATE--+-<span><span class="italic">variable</span></span>----------+--------------------><
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'-<span class="italic">string-expression</span>-'
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</pre>
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<a name="skipsyn-338" id="skipsyn-338"></a>
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<a name="synsexeimm"></a>
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<h3 id="synsexeimm"><a href="rbafzmst02.htm#ToC_1068">Description</a></h3><a id="idx2565" name="idx2565"></a>
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<dl class="parml">
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<dt class="bold"><var class="pv">variable</var> </dt><a id="idx2566" name="idx2566"></a>
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<dd>Identifies a variable that must be declared in accordance
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with the rules for declaring character-string, UTF-16 graphic, or UCS-2 graphic
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variables. An indicator variable must not be specified.
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</dd>
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<dt class="bold"><var class="pv">string-expression</var></dt><a id="idx2567" name="idx2567"></a>
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<dd>A <var class="pv">string-expression</var> is any PL/I <var class="pv">string-expression</var> that
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yields a character string. SQL expressions that yield a character string are
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not allowed. A <var class="pv">string-expression</var> is only allowed in PL/I.
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</dd>
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</dl><a id="idx2568" name="idx2568"></a><a id="idx2569" name="idx2569"></a>
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<p>The value of the identified variable or string expression is called a <var class="pv">statement string</var>.</p>
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<p>The statement string must be one of the following SQL statements:<sup class="fn"><a id="wq1494" name="wq1494" href="rbafzmstexim.htm#wq1495">70</a></sup></p>
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<a name="wq1496"></a>
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<table id="wq1496" width="100%" summary="" border="0" frame="void" rules="none">
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<tbody valign="top">
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<tr>
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<td width="33%" align="left" valign="top">ALTER</td>
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<td width="33%" align="left" valign="top">INSERT</td>
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<td width="33%" align="left" valign="top">SET CURRENT DEBUG MODE</td>
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</tr>
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<tr>
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<td align="left" valign="top">CALL</td>
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<td align="left" valign="top">LABEL</td>
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<td align="left" valign="top">SET CURRENT DEGREE</td>
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</tr>
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<tr>
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<td align="left" valign="top">COMMENT</td>
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<td align="left" valign="top">LOCK TABLE</td>
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<td align="left" valign="top">SET ENCRYPTION PASSWORD</td>
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</tr>
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<tr>
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<td align="left" valign="top">COMMIT</td>
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<td align="left" valign="top">REFRESH TABLE</td>
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<td align="left" valign="top">SET PATH</td>
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</tr>
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<tr>
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<td align="left" valign="top">CREATE</td>
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<td align="left" valign="top">RELEASE SAVEPOINT</td>
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<td align="left" valign="top">SET SCHEMA</td>
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</tr>
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<tr>
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<td align="left" valign="top">DECLARE GLOBAL TEMPORARY TABLE</td>
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<td align="left" valign="top">RENAME</td>
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<td align="left" valign="top">SET SESSION AUTHORIZATION</td>
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</tr>
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<tr>
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<td align="left" valign="top">DELETE</td>
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<td align="left" valign="top">REVOKE</td>
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<td align="left" valign="top">SET TRANSACTION</td>
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</tr>
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<tr>
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<td align="left" valign="top">DROP</td>
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<td align="left" valign="top">ROLLBACK</td>
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<td align="left" valign="top">UPDATE</td>
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</tr>
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<tr>
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<td>GRANT</td>
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<td>SAVEPOINT</td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>The statement string must not: </p>
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<ul>
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<li>Begin with EXEC SQL and end with END-EXEC or a semicolon (;).</li>
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<li>Include references to variables.</li>
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<li>Include parameter markers.</li></ul>
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<p>When an EXECUTE IMMEDIATE statement is executed, the specified statement
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string is parsed and checked for errors. If the SQL statement is not valid,
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it is not executed and the error condition that prevents its execution is
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reported in the stand-alone SQLSTATE and SQLCODE. If the SQL statement is
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valid, but an error occurs during its execution, that error condition is reported
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in the stand-alone SQLSTATE and SQLCODE. Additional information on the error
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can be retrieved from the SQL Diagnostics Area (or the SQLCA).</p>
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<a name="wq1497"></a>
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<h3 id="wq1497"><a href="rbafzmst02.htm#ToC_1069">Note</a></h3>
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<p>If the same SQL statement is to be executed more than once, it is more
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efficient to use the PREPARE and EXECUTE statements rather than the EXECUTE
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IMMEDIATE statement.</p>
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<a name="wq1498"></a>
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<h3 id="wq1498"><a href="rbafzmst02.htm#ToC_1070">Example</a></h3>
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<p>Use C to execute the SQL statement in the variable Qstring. </p>
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<pre class="xmp">void main ()
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{
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EXEC SQL <span class="bold">BEGIN DECLARE SECTION</span> END-EXEC.
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char Qstring[100] = "<span class="bold">INSERT INTO</span> WORK_TABLE <span class="bold">SELECT * FROM</span> EMPPROJACT
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<span class="bold">WHERE</span> ACTNO >= 100";
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EXEC SQL <span class="bold">END DECLARE SECTION</span> END-EXEC.
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EXEC SQL <span class="bold">INCLUDE SQLCA</span>;
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.
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.
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.
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EXEC SQL <span class="bold">EXECUTE IMMEDIATE</span> :Qstring;
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return;
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}</pre><a id="idx2570" name="idx2570"></a><a id="idx2571" name="idx2571"></a><a id="idx2572" name="idx2572"></a>
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<hr /><div class="fnnum"><a id="wq1495" name="wq1495" href="rbafzmstexim.htm#wq1494">70</a>.</div>
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<div class="fntext">A <var class="pv">select-statement</var> is not allowed. To dynamically process a <var class="pv">select-statement</var>, use the PREPARE, DECLARE CURSOR, and OPEN statements.</div>
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<br />
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<hr /><br />
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[ <a href="#Top_Of_Page">Top of Page</a> | <a href="rbafzmsthexeqt.htm">Previous Page</a> | <a href="rbafzmstfets.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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</html>
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