~ubuntu-branches/ubuntu/trusty/postgresql-9.3/trusty-updates : contents of doc/src/sgml/html/sql-rollback-to.html at revision 27

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><H1
><A
NAME="SQL-ROLLBACK-TO"
></A
>ROLLBACK TO SAVEPOINT</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN79935"
></A
><H2
>Name</H2
>ROLLBACK TO SAVEPOINT&nbsp;--&nbsp;roll back to a savepoint</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN79943"
></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="AEN79946"
></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="AEN79951"
></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="AEN79959"
></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="AEN79971"
></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="AEN79978"
></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="AEN79990"
></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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