<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >SAVEPOINT</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 8.0.11 Documentation" HREF="index.html"><LINK REL="UP" TITLE="SQL Commands" HREF="sql-commands.html"><LINK REL="PREVIOUS" TITLE="ROLLBACK TO SAVEPOINT" HREF="sql-rollback-to.html"><LINK REL="NEXT" TITLE="SELECT" HREF="sql-select.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2007-02-02T03:57:22"></HEAD ><BODY CLASS="REFENTRY" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" >PostgreSQL 8.0.11 Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql-rollback-to.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="sql-rollback-to.html" >Fast Backward</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="sql-select.html" >Fast Forward</A ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="top" ><A HREF="sql-select.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SQL-SAVEPOINT" ></A >SAVEPOINT</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN44509" ></A ><H2 >Name</H2 >SAVEPOINT -- define a new savepoint within the current transaction</DIV ><A NAME="AEN44512" ></A ><A NAME="AEN44514" ></A ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN44517" ></A ><H2 >Synopsis</H2 ><PRE CLASS="SYNOPSIS" >SAVEPOINT <TT CLASS="REPLACEABLE" ><I >savepoint_name</I ></TT ></PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN44520" ></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="AEN44525" ></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="AEN44533" ></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="AEN44539" ></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="AEN44545" ></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="AEN44552" ></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 ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sql-rollback-to.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sql-select.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >ROLLBACK TO SAVEPOINT</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="sql-commands.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SELECT</TD ></TR ></TABLE ></DIV ></BODY ></HTML >