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>SAVEPOINT</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN53560"
></A
><H2
>Name</H2
>SAVEPOINT -- define a new savepoint within the current transaction</DIV
><A
NAME="AEN53563"
></A
><A
NAME="AEN53565"
></A
><DIV
CLASS="REFSYNOPSISDIV"
><A
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></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>SAVEPOINT <TT
CLASS="REPLACEABLE"
><I
>savepoint_name</I
></TT
></PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN53571"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>SAVEPOINT</TT
> establishes a new savepoint within
the current transaction.
</P
><P
> A savepoint is a special mark inside a transaction that allows all commands
that are executed after it was established to be rolled back, restoring
the transaction state to what it was at the time of the savepoint.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN53576"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>savepoint_name</I
></TT
></DT
><DD
><P
> The name to give to the new savepoint.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN53584"
></A
><H2
>Notes</H2
><P
> Use <A
HREF="sql-rollback-to.html"
><I
>ROLLBACK TO SAVEPOINT</I
></A
> to
rollback to a savepoint. Use <A
HREF="sql-release-savepoint.html"
><I
>RELEASE SAVEPOINT</I
></A
> to destroy a savepoint, keeping
the effects of commands executed after it was established.
</P
><P
> Savepoints can only be established when inside a transaction block.
There can be multiple savepoints defined within a transaction.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN53590"
></A
><H2
>Examples</H2
><P
> To establish a savepoint and later undo the effects of all commands executed
after it was established:
</P><PRE
CLASS="PROGRAMLISTING"
>BEGIN;
INSERT INTO table1 VALUES (1);
SAVEPOINT my_savepoint;
INSERT INTO table1 VALUES (2);
ROLLBACK TO SAVEPOINT my_savepoint;
INSERT INTO table1 VALUES (3);
COMMIT;</PRE
><P>
The above transaction will insert the values 1 and 3, but not 2.
</P
><P
> To establish and later destroy a savepoint:
</P><PRE
CLASS="PROGRAMLISTING"
>BEGIN;
INSERT INTO table1 VALUES (3);
SAVEPOINT my_savepoint;
INSERT INTO table1 VALUES (4);
RELEASE SAVEPOINT my_savepoint;
COMMIT;</PRE
><P>
The above transaction will insert both 3 and 4.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN53596"
></A
><H2
>Compatibility</H2
><P
> SQL requires a savepoint to be destroyed automatically when another
savepoint with the same name is established. In
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, the old savepoint is kept, though only the more
recent one will be used when rolling back or releasing. (Releasing the
newer savepoint will cause the older one to again become accessible to
<TT
CLASS="COMMAND"
>ROLLBACK TO SAVEPOINT</TT
> and <TT
CLASS="COMMAND"
>RELEASE SAVEPOINT</TT
>.)
Otherwise, <TT
CLASS="COMMAND"
>SAVEPOINT</TT
> is fully SQL conforming.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN53603"
></A
><H2
>See Also</H2
><A
HREF="sql-begin.html"
><I
>BEGIN</I
></A
>, <A
HREF="sql-commit.html"
><I
>COMMIT</I
></A
>, <A
HREF="sql-release-savepoint.html"
><I
>RELEASE SAVEPOINT</I
></A
>, <A
HREF="sql-rollback.html"
><I
>ROLLBACK</I
></A
>, <A
HREF="sql-rollback-to.html"
><I
>ROLLBACK TO SAVEPOINT</I
></A
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