MAINHACK

Viewing / Editing File: ROLLBACK_TO_SAVEPOINT.7

File is not writable. Editing disabled.
'\" t
.\"     Title: ROLLBACK TO SAVEPOINT
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 2017-11-06
.\"    Manual: PostgreSQL 9.2.24 Documentation
.\"    Source: PostgreSQL 9.2.24
.\"  Language: English
.\"
.TH "ROLLBACK TO SAVEPOINT" "7" "2017-11-06" "PostgreSQL 9.2.24" "PostgreSQL 9.2.24 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"
ROLLBACK_TO_SAVEPOINT \- roll back to a savepoint
.\" ROLLBACK TO SAVEPOINT
.\" savepoints: rolling back
.SH "SYNOPSIS"
.sp
.nf
ROLLBACK [ WORK | TRANSACTION ] TO [ SAVEPOINT ] \fIsavepoint_name\fR
.fi
.SH "DESCRIPTION"
.PP
Roll back all commands that were executed after the savepoint was established\&. The savepoint remains valid and can be rolled back to again later, if needed\&.
.PP
\fBROLLBACK TO SAVEPOINT\fR
implicitly destroys all savepoints that were established after the named savepoint\&.
.SH "PARAMETERS"
.PP
\fIsavepoint_name\fR
.RS 4
The savepoint to roll back to\&.
.RE
.SH "NOTES"
.PP
Use
RELEASE SAVEPOINT (\fBRELEASE_SAVEPOINT\fR(7))
to destroy a savepoint without discarding the effects of commands executed after it was established\&.
.PP
Specifying a savepoint name that has not been established is an error\&.
.PP
Cursors have somewhat non\-transactional behavior with respect to savepoints\&. Any cursor that is opened inside a savepoint will be closed when the savepoint is rolled back\&. If a previously opened cursor is affected by a
\fBFETCH\fR
or
\fBMOVE\fR
command inside a savepoint that is later rolled back, the cursor remains at the position that
\fBFETCH\fR
left it pointing to (that is, the cursor motion caused by
\fBFETCH\fR
is not rolled back)\&. Closing a cursor is not undone by rolling back, either\&. However, other side\-effects caused by the cursor\*(Aqs query (such as side\-effects of volatile functions called by the query)
\fIare\fR
rolled back if they occur during a savepoint that is later rolled back\&. A cursor whose execution causes a transaction to abort is put in a cannot\-execute state, so while the transaction can be restored using
\fBROLLBACK TO SAVEPOINT\fR, the cursor can no longer be used\&.
.SH "EXAMPLES"
.PP
To undo the effects of the commands executed after
my_savepoint
was established:
.sp
.if n \{\
.RS 4
.\}
.nf
ROLLBACK TO SAVEPOINT my_savepoint;
.fi
.if n \{\
.RE
.\}
.PP
Cursor positions are not affected by savepoint rollback:
.sp
.if n \{\
.RS 4
.\}
.nf
BEGIN;

DECLARE foo CURSOR FOR SELECT 1 UNION SELECT 2;

SAVEPOINT foo;

FETCH 1 FROM foo;
 ?column? 
\-\-\-\-\-\-\-\-\-\-
        1

ROLLBACK TO SAVEPOINT foo;

FETCH 1 FROM foo;
 ?column? 
\-\-\-\-\-\-\-\-\-\-
        2

COMMIT;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
The
SQL
standard specifies that the key word
SAVEPOINT
is mandatory, but
PostgreSQL
and
Oracle
allow it to be omitted\&. SQL allows only
WORK, not
TRANSACTION, as a noise word after
ROLLBACK\&. Also, SQL has an optional clause
AND [ NO ] CHAIN
which is not currently supported by
PostgreSQL\&. Otherwise, this command conforms to the SQL standard\&.
.SH "SEE ALSO"
\fBBEGIN\fR(7), \fBCOMMIT\fR(7), RELEASE SAVEPOINT (\fBRELEASE_SAVEPOINT\fR(7)), \fBROLLBACK\fR(7), \fBSAVEPOINT\fR(7)
Cancel / Back
[ MAINHACK ]

Viewing / Editing File: ROLLBACK_TO_SAVEPOINT.7

Server Info

System Features

User Info
