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diff --git a/doc/src/sgml/html/spi-spi-modifytuple.html b/doc/src/sgml/html/spi-spi-modifytuple.html new file mode 100644 index 0000000..96bc78d --- /dev/null +++ b/doc/src/sgml/html/spi-spi-modifytuple.html @@ -0,0 +1,59 @@ +<?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 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. 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Memory Management</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 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 /></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 class="navfooter"><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. 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