<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/rollback.sgml,v 1.14 2003/04/26 23:56:51 petere Exp $
PostgreSQL documentation
-->

<refentry id="SQL-ROLLBACK">
 <refmeta>
  <refentrytitle id="SQL-ROLLBACK-TITLE">ROLLBACK</refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>ROLLBACK</refname>
  <refpurpose>abort the current transaction</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ROLLBACK [ WORK | TRANSACTION ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ROLLBACK</command> rolls back the current transaction and causes
   all the updates made by the transaction to be discarded.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><literal>WORK</literal></term>
    <term><literal>TRANSACTION</literal></term>
    <listitem>
     <para>
      Optional key words. They have no effect.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Diagnostics</title>
	
  <variablelist>
   <varlistentry>
    <term><computeroutput>ROLLBACK</computeroutput></term>
    <listitem>
     <para>
      Message returned if successful.
     </para>
    </listitem>
   </varlistentry>
     
   <varlistentry>
    <term><computeroutput>WARNING:  ROLLBACK: no transaction in progress</computeroutput></term>
    <listitem>
     <para>
      If there is not any transaction currently in progress.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Notes</title>

  <para>
   Use <xref linkend="SQL-COMMIT" endterm="SQL-COMMIT-TITLE"> to
   successfully terminate a transaction.
  </para>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   To abort all changes:
<programlisting>
ROLLBACK;
</programlisting>
  </para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   The SQL standard only specifies the two forms
   <literal>ROLLBACK</literal> and <literal>ROLLBACK
   WORK</literal>. Otherwise, this command is fully conforming.
  </para>
 </refsect1>
</refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:nil
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
sgml-parent-document:nil
sgml-default-dtd-file:"../reference.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:"/usr/lib/sgml/catalog"
sgml-local-ecat-files:nil
End:
-->
