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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:15:05 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:15:05 +0000
commit46651ce6fe013220ed397add242004d764fc0153 (patch)
tree6e5299f990f88e60174a1d3ae6e48eedd2688b2b /doc/src/sgml/html/spi-spi-modifytuple.html
parentInitial commit. (diff)
downloadpostgresql-14-46651ce6fe013220ed397add242004d764fc0153.tar.xz
postgresql-14-46651ce6fe013220ed397add242004d764fc0153.zip
Adding upstream version 14.5.upstream/14.5upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!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 xmlns="http://www.w3.org/TR/xhtml1/transitional" 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 14.5 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></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>
+ </p></div></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="spi-spi-returntuple.html" title="SPI_returntuple">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="spi-memory.html" title="47.3. Memory Management">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="spi-spi-freetuple.html" title="SPI_freetuple">Next</a></td></tr><tr><td width="40%" align="left" valign="top">SPI_returntuple </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 14.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> SPI_freetuple</td></tr></table></div></body></html> \ No newline at end of file
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