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SPI_returntuple.3
'\" t .\" Title: SPI_returntuple .\" Author: The PostgreSQL Global Development Group .\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/> .\" Date: 2023 .\" Manual: PostgreSQL 13.13 Documentation .\" Source: PostgreSQL 13.13 .\" Language: English .\" .TH "SPI_RETURNTUPLE" "3" "2023" "PostgreSQL 13.13" "PostgreSQL 13.13 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_returntuple \- prepare to return a tuple as a Datum .SH "SYNOPSIS" .sp .nf HeapTupleHeader SPI_returntuple(HeapTuple \fIrow\fR, TupleDesc \fIrowdesc\fR) .fi .SH "DESCRIPTION" .PP \fBSPI_returntuple\fR makes a copy of a row in the upper executor context, returning it in the form of a row type Datum\&. The returned pointer need only be converted to Datum via \fBPointerGetDatum\fR before returning\&. .PP This function can only be used while connected to SPI\&. Otherwise, it returns NULL and sets \fISPI_result\fR to SPI_ERROR_UNCONNECTED\&. .PP Note that this should be used for functions that are declared to return composite types\&. It is not used for triggers; use \fBSPI_copytuple\fR for returning a modified row in a trigger\&. .SH "ARGUMENTS" .PP HeapTuple \fIrow\fR .RS 4 row to be copied .RE .PP TupleDesc \fIrowdesc\fR .RS 4 descriptor for row (pass the same descriptor each time for most effective caching) .RE .SH "RETURN VALUE" .PP HeapTupleHeader pointing to copied row, or NULL on error (see \fISPI_result\fR for an error indication)
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