75 lines
5.2 KiB
HTML
75 lines
5.2 KiB
HTML
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<meta name="DC.Title" content="SQL descriptor areas" />
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<meta name="abstract" content="Dynamic SQL uses an SQL descriptor area (SQLDA) to pass information about an SQL statement between SQL and your application. A descriptor is required for running the DESCRIBE, DESCRIBE INPUT and DESCRIBE TABLE statements, and can also be used on the PREPARE, OPEN, FETCH, CALL, and EXECUTE statements." />
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<meta name="DC.subject" content="SQL descriptor area (SQLDA), dynamic SQL, SQLDA (SQL descriptor area), SQLDA (SQL descriptor area), programming language, use in" />
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<title>SQL descriptor areas</title>
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<body id="rbafysqlda"><a name="rbafysqlda"><!-- --></a>
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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">SQL descriptor areas</h1>
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<div><p>Dynamic SQL uses an SQL descriptor area (SQLDA) to pass information
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about an SQL statement between SQL and your application. A descriptor is required
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for running the DESCRIBE, DESCRIBE INPUT and DESCRIBE TABLE statements, and
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can also be used on the PREPARE, OPEN, FETCH, CALL, and EXECUTE statements.</p>
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<div class="section"><p>The meaning of the information in an SQLDA depends on its use.
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In PREPARE and DESCRIBE, an SQLDA provides information to an application program
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about a prepared statement. In DESCRIBE INPUT, the SQL descriptor area provides
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information to an application program about parameter markers in a prepared
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statement. In DESCRIBE TABLE, the SQLDA provides information
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to an application program about the columns in a table or view. In OPEN, EXECUTE,
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CALL, and FETCH, an SQLDA provides information about host variables. For example,
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you can read values into the SQLDA using a DESCRIBE statement, change the
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data values in the descriptor to use the host variables, and then reuse the
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same descriptor in a FETCH statement.</p>
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</div>
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<div class="section"><p>If your application allows you to have several cursors open at
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the same time, you can code several SQLDAs, one for each dynamic SELECT statement.
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</p>
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</div>
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<div class="section"><p><img src="./delta.gif" alt="Start of change" />There are two types of SQLDAs. One is defined
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with the ALLOCATE DESCRIPTOR statement. The other is defined using the SQLDA
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structure.<img src="./deltaend.gif" alt="End of change" /></p>
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<p><img src="./delta.gif" alt="Start of change" />ALLOCATE DESCRIPTOR is not supported in
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REXX. SQLDAs can be used in C, C++, <span class="keyword">COBOL</span>,
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PL/I, REXX, and <span class="keyword">RPG</span>. Because
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RPG/400 does not provide a way to set pointers, the SQLDA must be set outside
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the RPG/400 program by a PL/I, C, C++, COBOL, or ILE RPG program. That program
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must then call the RPG/400 program.<img src="./deltaend.gif" alt="End of change" /></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="rbafyprocesssqlda.htm" title="There are two basic types of SELECT statements: fixed list and varying list.">Process SELECT statements and use a descriptor</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="../db2/rbafzmstsqlcca.htm">SQLCA (SQL communications area)</a></div>
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<div><a href="../db2/rbafzmstsqldda.htm">SQLDA (SQL descriptor area)</a></div>
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</div>
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</div>
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