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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_modifytuple</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-spi-returntuple.html" title="SPI_returntuple" /><link rel="next" href="spi-spi-freetuple.html" title="SPI_freetuple" /></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_modifytuple</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="spi-spi-returntuple.html" title="SPI_returntuple">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="spi-memory.html" title="47.3. Memory Management">Up</a></td><th width="60%" align="center">47.3. Memory Management</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-freetuple.html" title="SPI_freetuple">Next</a></td></tr></table><hr /></div><div class="refentry" id="SPI-SPI-MODIFYTUPLE"><div class="titlepage"></div><a id="id-1.8.12.10.11.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">SPI_modifytuple</span></h2><p>SPI_modifytuple — create a row by replacing selected fields of a given row</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
HeapTuple SPI_modifytuple(Relation <em class="parameter"><code>rel</code></em>, HeapTuple <em class="parameter"><code>row</code></em>, int <em class="parameter"><code>ncols</code></em>,
int * <em class="parameter"><code>colnum</code></em>, Datum * <em class="parameter"><code>values</code></em>, const char * <em class="parameter"><code>nulls</code></em>)
</pre></div><div class="refsect1" id="id-1.8.12.10.11.5"><h2>Description</h2><p>
<code class="function">SPI_modifytuple</code> creates a new row by
substituting new values for selected columns, copying the original
row's columns at other positions. The input row is not modified.
The new row is returned in the upper executor context.
</p><p>
This function can only be used while connected to SPI.
Otherwise, it returns NULL and sets <code class="varname">SPI_result</code> to
<code class="symbol">SPI_ERROR_UNCONNECTED</code>.
</p></div><div class="refsect1" id="id-1.8.12.10.11.6"><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">Relation <em class="parameter"><code>rel</code></em></code></span></dt><dd><p>
Used only as the source of the row descriptor for the row.
(Passing a relation rather than a row descriptor is a
misfeature.)
</p></dd><dt><span class="term"><code class="literal">HeapTuple <em class="parameter"><code>row</code></em></code></span></dt><dd><p>
row to be modified
</p></dd><dt><span class="term"><code class="literal">int <em class="parameter"><code>ncols</code></em></code></span></dt><dd><p>
number of columns to be changed
</p></dd><dt><span class="term"><code class="literal">int * <em class="parameter"><code>colnum</code></em></code></span></dt><dd><p>
an array of length <em class="parameter"><code>ncols</code></em>, containing the numbers
of the columns that are to be changed (column numbers start at 1)
</p></dd><dt><span class="term"><code class="literal">Datum * <em class="parameter"><code>values</code></em></code></span></dt><dd><p>
an array of length <em class="parameter"><code>ncols</code></em>, containing the
new values for the specified columns
</p></dd><dt><span class="term"><code class="literal">const char * <em class="parameter"><code>nulls</code></em></code></span></dt><dd><p>
an array of length <em class="parameter"><code>ncols</code></em>, describing which
new values are null
</p><p>
If <em class="parameter"><code>nulls</code></em> is <code class="symbol">NULL</code> then
<code class="function">SPI_modifytuple</code> assumes that no new values
are null. Otherwise, each entry of the <em class="parameter"><code>nulls</code></em>
array should be <code class="literal">' '</code> if the corresponding new value is
non-null, or <code class="literal">'n'</code> if the corresponding new value is
null. (In the latter case, the actual value in the corresponding
<em class="parameter"><code>values</code></em> entry doesn't matter.) Note that
<em class="parameter"><code>nulls</code></em> is not a text string, just an array: it
does not need a <code class="literal">'\0'</code> terminator.
</p></dd></dl></div></div><div class="refsect1" id="id-1.8.12.10.11.7"><h2>Return Value</h2><p>
new row with modifications, allocated in the upper executor
context, or <code class="symbol">NULL</code> on error
(see <code class="varname">SPI_result</code> for an error indication)
</p><p>
On error, <code class="varname">SPI_result</code> is set as follows:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="symbol">SPI_ERROR_ARGUMENT</code></span></dt><dd><p>
if <em class="parameter"><code>rel</code></em> is <code class="symbol">NULL</code>, or if
<em class="parameter"><code>row</code></em> is <code class="symbol">NULL</code>, or if <em class="parameter"><code>ncols</code></em>
is less than or equal to 0, or if <em class="parameter"><code>colnum</code></em> is
<code class="symbol">NULL</code>, or if <em class="parameter"><code>values</code></em> is <code class="symbol">NULL</code>.
</p></dd><dt><span class="term"><code class="symbol">SPI_ERROR_NOATTRIBUTE</code></span></dt><dd><p>
if <em class="parameter"><code>colnum</code></em> contains an invalid column number (less
than or equal to 0 or greater than the number of columns in
<em class="parameter"><code>row</code></em>)
</p></dd><dt><span class="term"><code class="symbol">SPI_ERROR_UNCONNECTED</code></span></dt><dd><p>
if SPI is not active
</p></dd></dl></div><p>
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