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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>SPI_fname</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="spi-interface-support.html" title="47.2. Interface Support Functions" /><link rel="next" href="spi-spi-fnumber.html" title="SPI_fnumber" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">SPI_fname</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="spi-interface-support.html" title="47.2. Interface Support Functions">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="spi-interface-support.html" title="47.2. Interface Support Functions">Up</a></td><th width="60%" align="center">47.2. Interface Support Functions</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="spi-spi-fnumber.html" title="SPI_fnumber">Next</a></td></tr></table><hr /></div><div class="refentry" id="SPI-SPI-FNAME"><div class="titlepage"></div><a id="id-1.8.12.9.4.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">SPI_fname</span></h2><p>SPI_fname — determine the column name for the specified column number</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
char * SPI_fname(TupleDesc <em class="parameter"><code>rowdesc</code></em>, int <em class="parameter"><code>colnumber</code></em>)
</pre></div><div class="refsect1" id="id-1.8.12.9.4.5"><h2>Description</h2><p>
<code class="function">SPI_fname</code> returns a copy of the column name of the
specified column. (You can use <code class="function">pfree</code> to
release the copy of the name when you don't need it anymore.)
</p></div><div class="refsect1" id="id-1.8.12.9.4.6"><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">TupleDesc <em class="parameter"><code>rowdesc</code></em></code></span></dt><dd><p>
input row description
</p></dd><dt><span class="term"><code class="literal">int <em class="parameter"><code>colnumber</code></em></code></span></dt><dd><p>
column number (count starts at 1)
</p></dd></dl></div></div><div class="refsect1" id="id-1.8.12.9.4.7"><h2>Return Value</h2><p>
The column name; <code class="symbol">NULL</code> if
<em class="parameter"><code>colnumber</code></em> is out of range.
<code class="varname">SPI_result</code> set to
<code class="symbol">SPI_ERROR_NOATTRIBUTE</code> on error.
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