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<?xml version='1.0' encoding='iso-8859-1'?>
<!-- $Revision: 1.4 $ -->
<!-- Generated by xml_proto.php v2.1. Found in /scripts directory of phpdoc. -->
<refentry id="function.PDO-rollBack">
<refnamediv>
<refname>PDO::rollBack</refname>
<refpurpose>
Rolls back a transaction
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>PDO::rollBack</methodname>
<void/>
</methodsynopsis>
&warn.experimental.func;
<para>
When issued against databases that support transactions,
<function>PDO::rollBack</function> rolls back any work in progress
and returns the connection state to autocommit mode.
</para>
<para>
You must issue <function>PDO::beginTransaction</function> to set the
connection state to manual commit mode before issuing
<function>PDO::rollBack</function> has any effect.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example><title>Roll back a transaction</title>
<programlisting role='php'>
<![CDATA[
<?php
/* Begin a transaction, turning off autocommit */
$dbh->beginTransaction();
/* Change the database schema and data */
$sth = $dbh->exec("DROP TABLE fruit");
$sth = $dbh->exec("UPDATE dessert
SET name = 'hamburger'");
/* Recognize mistake and roll back changes */
$dbh->rollBack();
/* Database connection is now back in autocommit mode */
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>PDO::beginTransaction</function></member>
<member><function>PDO::commit</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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