blob: 7d82491637b47084ea805cb6781b16a2d8a27447 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
'\" t
.\" Title: SPI_returntuple
.\" Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 2023
.\" Manual: PostgreSQL 15.5 Documentation
.\" Source: PostgreSQL 15.5
.\" Language: English
.\"
.TH "SPI_RETURNTUPLE" "3" "2023" "PostgreSQL 15.5" "PostgreSQL 15.5 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)
|
