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><H1
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>ROLLBACK TO SAVEPOINT</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN77321"
></A
><H2
>Name</H2
>ROLLBACK TO SAVEPOINT -- roll back to a savepoint</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN77329"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ROLLBACK [ WORK | TRANSACTION ] TO [ SAVEPOINT ] <TT
CLASS="REPLACEABLE"
><I
>savepoint_name</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77332"
></A
><H2
>Description</H2
><P
> 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.
</P
><P
> <TT
CLASS="COMMAND"
>ROLLBACK TO SAVEPOINT</TT
> implicitly destroys all savepoints that
were established after the named savepoint.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77337"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>savepoint_name</I
></TT
></DT
><DD
><P
> The savepoint to roll back to.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77345"
></A
><H2
>Notes</H2
><P
> Use <A
HREF="sql-release-savepoint.html"
>RELEASE SAVEPOINT</A
> to destroy a savepoint
without discarding the effects of commands executed after it was
established.
</P
><P
> Specifying a savepoint name that has not been established is an error.
</P
><P
> 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 <TT
CLASS="COMMAND"
>FETCH</TT
> or <TT
CLASS="COMMAND"
>MOVE</TT
> command inside a
savepoint that is later rolled back, the cursor remains at the
position that <TT
CLASS="COMMAND"
>FETCH</TT
> left it pointing to (that is, the cursor
motion caused by <TT
CLASS="COMMAND"
>FETCH</TT
> is not rolled back).
Closing a cursor is not undone by rolling back, either.
However, other side-effects caused by the cursor's query (such as
side-effects of volatile functions called by the query) <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>are</I
></SPAN
>
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
<TT
CLASS="COMMAND"
>ROLLBACK TO SAVEPOINT</TT
>, the cursor can no longer be used.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77357"
></A
><H2
>Examples</H2
><P
> To undo the effects of the commands executed after <TT
CLASS="LITERAL"
>my_savepoint</TT
>
was established:
</P><PRE
CLASS="PROGRAMLISTING"
>ROLLBACK TO SAVEPOINT my_savepoint;</PRE
><P>
</P
><P
> Cursor positions are not affected by savepoint rollback:
</P><PRE
CLASS="PROGRAMLISTING"
>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;</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77364"
></A
><H2
>Compatibility</H2
><P
> The <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> standard specifies that the key word
<TT
CLASS="LITERAL"
>SAVEPOINT</TT
> is mandatory, but <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
and <SPAN
CLASS="PRODUCTNAME"
>Oracle</SPAN
> allow it to be omitted. SQL allows
only <TT
CLASS="LITERAL"
>WORK</TT
>, not <TT
CLASS="LITERAL"
>TRANSACTION</TT
>, as a noise word
after <TT
CLASS="LITERAL"
>ROLLBACK</TT
>. Also, SQL has an optional clause
<TT
CLASS="LITERAL"
>AND [ NO ] CHAIN</TT
> which is not currently supported by
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>. Otherwise, this command conforms to
the SQL standard.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN77376"
></A
><H2
>See Also</H2
><A
HREF="sql-begin.html"
>BEGIN</A
>, <A
HREF="sql-commit.html"
>COMMIT</A
>, <A
HREF="sql-release-savepoint.html"
>RELEASE SAVEPOINT</A
>, <A
HREF="sql-rollback.html"
>ROLLBACK</A
>, <A
HREF="sql-savepoint.html"
>SAVEPOINT</A
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