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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>SET DESCRIPTOR</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="ecpg-sql-set-connection.html" title="SET CONNECTION" /><link rel="next" href="ecpg-sql-type.html" title="TYPE" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">SET DESCRIPTOR</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="ecpg-sql-set-connection.html" title="SET CONNECTION">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="ecpg-sql-commands.html" title="36.14. Embedded SQL Commands">Up</a></td><th width="60%" align="center">36.14. Embedded SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="ecpg-sql-type.html" title="TYPE">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="ECPG-SQL-SET-DESCRIPTOR"><div class="titlepage"></div><div class="refnamediv"><h2>SET DESCRIPTOR</h2><p>SET DESCRIPTOR — set information in an SQL descriptor area</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
SET DESCRIPTOR <em class="replaceable"><code>descriptor_name</code></em> <em class="replaceable"><code>descriptor_header_item</code></em> = <em class="replaceable"><code>value</code></em> [, ... ]
SET DESCRIPTOR <em class="replaceable"><code>descriptor_name</code></em> VALUE <em class="replaceable"><code>number</code></em> <em class="replaceable"><code>descriptor_item</code></em> = <em class="replaceable"><code>value</code></em> [, ...]
</pre></div><div class="refsect1" id="id-1.7.5.20.15.3"><h2>Description</h2><p>
     <code class="command">SET DESCRIPTOR</code> populates an SQL descriptor
     area with values.  The descriptor area is then typically used to
     bind parameters in a prepared query execution.
    </p><p>
     This command has two forms: The first form applies to the
     descriptor <span class="quote">“<span class="quote">header</span>”</span>, which is independent of a
     particular datum.  The second form assigns values to particular
     datums, identified by number.
    </p></div><div class="refsect1" id="id-1.7.5.20.15.4"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>descriptor_name</code></em></span></dt><dd><p>
        A descriptor name.
       </p></dd><dt><span class="term"><em class="replaceable"><code>descriptor_header_item</code></em></span></dt><dd><p>
        A token identifying which header information item to set.
        Only <code class="literal">COUNT</code>, to set the number of descriptor
        items, is currently supported.
       </p></dd><dt><span class="term"><em class="replaceable"><code>number</code></em></span></dt><dd><p>
        The number of the descriptor item to set.  The count starts at
        1.
       </p></dd><dt><span class="term"><em class="replaceable"><code>descriptor_item</code></em></span></dt><dd><p>
        A token identifying which item of information to set in the
        descriptor.  See <a class="xref" href="ecpg-descriptors.html#ECPG-NAMED-DESCRIPTORS" title="36.7.1. Named SQL Descriptor Areas">Section 36.7.1</a> for a
        list of supported items.
       </p></dd><dt><span class="term"><em class="replaceable"><code>value</code></em></span></dt><dd><p>
        A value to store into the descriptor item.  This can be an SQL
        constant or a host variable.
       </p></dd></dl></div></div><div class="refsect1" id="id-1.7.5.20.15.5"><h2>Examples</h2><pre class="programlisting">
EXEC SQL SET DESCRIPTOR indesc COUNT = 1;
EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = 2;
EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = :val1;
EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val1, DATA = 'some string';
EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val2null, DATA = :val2;
</pre></div><div class="refsect1" id="id-1.7.5.20.15.6"><h2>Compatibility</h2><p>
     <code class="command">SET DESCRIPTOR</code> is specified in the SQL standard.
    </p></div><div class="refsect1" id="id-1.7.5.20.15.7"><h2>See Also</h2><span class="simplelist"><a class="xref" href="ecpg-sql-allocate-descriptor.html" title="ALLOCATE DESCRIPTOR">ALLOCATE DESCRIPTOR</a>, <a class="xref" href="ecpg-sql-get-descriptor.html" title="GET DESCRIPTOR">GET DESCRIPTOR</a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ecpg-sql-set-connection.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ecpg-sql-commands.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ecpg-sql-type.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">SET CONNECTION </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> TYPE</td></tr></table></div></body></html>