77 lines
5.8 KiB
HTML
77 lines
5.8 KiB
HTML
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<meta name="DC.Title" content="Define SQL descriptor areas in RPG/400 applications that use SQL" />
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<meta name="abstract" content="There are two types of SQL descriptor areas. One is defined with the ALLOCATE DESCRIPTOR statement. The other is defined using the SQLDA structure. In this topic, only the SQLDA form is discussed." />
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<title>Define SQL descriptor areas in RPG/400 applications that use SQL</title>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Define SQL descriptor areas in RPG/400 applications that use SQL</h1>
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<div><p><span><img src="./delta.gif" alt="Start of change" />There are two types of SQL descriptor areas.
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One is defined with the ALLOCATE DESCRIPTOR statement. The other is defined
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using the SQLDA structure. In this topic, only the SQLDA form is discussed.<img src="./deltaend.gif" alt="End of change" /></span></p>
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<div class="section"> <p><img src="./delta.gif" alt="Start of change" />The following statements can use an SQLDA:<img src="./deltaend.gif" alt="End of change" /></p>
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<ul><li>EXECUTE…USING DESCRIPTOR <span class="synph"><span class="var">descriptor-name</span></span></li>
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<li>FETCH…USING DESCRIPTOR <span class="synph"><span class="var">descriptor-name</span></span></li>
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<li>OPEN…USING DESCRIPTOR <span class="synph"><span class="var">descriptor-name</span></span></li>
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<li>CALL…USING DESCRIPTOR <span class="synph"><span class="var">descriptor-name</span></span></li>
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<li>DESCRIBE <span class="synph"><span class="var">statement-name</span></span> INTO <span class="synph"><span class="var">descriptor-name</span></span></li>
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<li><img src="./delta.gif" alt="Start of change" />DESCRIBE INPUT <span class="synph"><span class="var">statement-name</span></span> INTO <span class="synph"><span class="var">descriptor-name</span></span><img src="./deltaend.gif" alt="End of change" /></li>
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<li>DESCRIBE TABLE <span class="synph"><span class="var">host-variable</span></span> INTO <span class="synph"><span class="var">descriptor-name</span></span></li>
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<li>PREPARE <span class="synph"><span class="var">statement-name</span></span> INTO <span class="synph"><span class="var">descriptor-name</span></span></li>
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</ul>
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</div>
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<div class="section"><p><img src="./delta.gif" alt="Start of change" />Unlike the SQLCA, there can be more than one
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SQLDA in a program and an SQLDA can have any valid name.<img src="./deltaend.gif" alt="End of change" /></p>
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<p>Dynamic SQL
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is an advanced programming technique.
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With dynamic SQL, your program can develop and then run SQL statements while
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the program is running. A SELECT statement with a variable SELECT list (that
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is, a list of the data to be returned as part of the query) that runs dynamically
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requires an SQL descriptor area (SQLDA). This is because you cannot know in
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advance how many or what type of variables to allocate in order to receive
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the results of the SELECT.</p>
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</div>
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<div class="section"><p>Because the SQLDA uses pointer variables which are not supported
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by RPG/400<sup>®</sup>,
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an INCLUDE SQLDA statement cannot be specified in an RPG/400 program. An SQLDA must be set
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up by a C, COBOL, PL/I, or ILE RPG program and passed to the RPG program in
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order to use it.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajprpg.htm" title="The RPG/400 licensed program supports both RPG II and RPG III programs.">Code SQL statements in RPG/400 applications</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../sqlp/rbafydynmic.htm">Dynamic SQL applications</a></div>
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<div><a href="../db2/rbafzmstsqldda.htm">SQL descriptor area</a></div>
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</div>
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</div>
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</body>
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