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'\" t .\" Title: SPI_fnumber .\" Author: The PostgreSQL Global Development Group .\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> .\" Date: 2018 .\" Manual: PostgreSQL 10.4 Documentation .\" Source: PostgreSQL 10.4 .\" Language: English .\" .TH "SPI_FNUMBER" "3" "2018" "PostgreSQL 10.4" "PostgreSQL 10.4 Documentation" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" SPI_fnumber \- determine the column number for the specified column name .SH "SYNOPSIS" .sp .nf int SPI_fnumber(TupleDesc \fIrowdesc\fR, const char * \fIcolname\fR) .fi .SH "DESCRIPTION" .PP \fBSPI_fnumber\fR returns the column number for the column with the specified name\&. .PP If \fIcolname\fR refers to a system column (e\&.g\&., oid) then the appropriate negative column number will be returned\&. The caller should be careful to test the return value for exact equality to SPI_ERROR_NOATTRIBUTE to detect an error; testing the result for less than or equal to 0 is not correct unless system columns should be rejected\&. .SH "ARGUMENTS" .PP TupleDesc \fIrowdesc\fR .RS 4 input row description .RE .PP const char * \fIcolname\fR .RS 4 column name .RE .SH "RETURN VALUE" .PP Column number (count starts at 1 for user\-defined columns), or SPI_ERROR_NOATTRIBUTE if the named column was not found\&.