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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@226685 c90b9560-bf6c-de11-be94-00142212c4b1
108 lines
2.9 KiB
XML
108 lines
2.9 KiB
XML
<?xml version='1.0' encoding='iso-8859-1'?>
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<!-- $Revision: 1.8 $ -->
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<refentry id="function.PDO-beginTransaction">
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<refnamediv>
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<refname>PDO->beginTransaction()</refname>
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<refpurpose>
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Initiates a transaction
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</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<classsynopsis>
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<ooclass><classname>PDO</classname></ooclass>
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<methodsynopsis>
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<type>bool</type><methodname>beginTransaction</methodname>
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<void/>
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</methodsynopsis>
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</classsynopsis>
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<para>
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Turns off autocommit mode. While autocommit mode is turned off, changes
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made to the database via the PDO object instance are not committed until
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you end the transaction by calling <xref linkend="function.PDO-commit" />.
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Calling <xref linkend="function.PDO-rollBack" /> will roll back all changes to
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the database and return the connection to autocommit mode.
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</para>
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<para>
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Some databases, including MySQL, automatically issue an implicit
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COMMIT when a database definition language (DDL) statement such as
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DROP TABLE or CREATE TABLE is issued within a transaction. The implicit
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COMMIT will prevent you from rolling back any other changes within the
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transaction boundary.
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example><title>Roll back a transaction</title>
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<para>
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The following example begins a transaction and issues two statements
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that modify the database before rolling back the changes. On MySQL,
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however, the DROP TABLE statement automatically commits the
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transaction so that none of the changes in the transaction are rolled
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back.
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</para>
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<programlisting role='php'>
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<![CDATA[
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<?php
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/* Begin a transaction, turning off autocommit */
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$dbh->beginTransaction();
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/* Change the database schema and data */
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$sth = $dbh->exec("DROP TABLE fruit");
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$sth = $dbh->exec("UPDATE dessert
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SET name = 'hamburger'");
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/* Recognize mistake and roll back changes */
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$dbh->rollBack();
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/* Database connection is now back in autocommit mode */
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><xref linkend="function.PDO-commit" /></member>
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<member><xref linkend="function.PDO-rollBack" /></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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