mirror of
https://github.com/sigmasternchen/php-doc-en
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94901ac701
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@190589 c90b9560-bf6c-de11-be94-00142212c4b1
147 lines
3.9 KiB
XML
147 lines
3.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.5 $ -->
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<!-- Generated by xml_proto.php v2.2. Found in /scripts directory of phpdoc. -->
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<refentry id="function.db2-rollback">
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<refnamediv>
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<refname>db2_rollback</refname>
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<refpurpose>
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Rolls back 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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<methodsynopsis>
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<type>bool</type><methodname>db2_rollback</methodname>
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<methodparam><type>resource</type><parameter>connection</parameter></methodparam>
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</methodsynopsis>
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<para>
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Rolls back an in-progress transaction on the specified connection resource and
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begins a new transaction. PHP applications normally default to AUTOCOMMIT
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mode, so <function>db2_rollback</function> normally has no effect unless
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AUTOCOMMIT has been turned off for the connection resource.
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</para>
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<note>
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<para>
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If the specified connection resource is a persistent connection, all
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transactions in progress for all applications using that persistent
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connection will be rolled back. For this reason, persistent connections
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are not recommended for use in applications that require transactions.
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</para>
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</note>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>connection</parameter></term>
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<listitem>
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<para>
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A valid database connection resource variable as returned from
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<function>db2_connect</function> or <function>db2_pconnect</function>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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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>
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<title>Rolling back a DELETE statement</title>
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<para>
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In the following example, we count the number of rows in a table, turn
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off AUTOCOMMIT mode on a database connection, delete all of the rows in
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the table and return the count of <literal>0</literal> to prove that the
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rows have been removed. We then issue <function>db2_rollback</function>
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and return the updated count of rows in the table to show that the number
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is the same as before we issued the DELETE statement. The return to the
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original state of the table demonstrates that the roll back of the
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transaction succeeded.
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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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$conn = db2_connect($database, $user, $password);
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if ($conn) {
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$stmt = db2_exec($conn, "SELECT count(*) FROM animals");
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$res = db2_fetch_array( $stmt );
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echo $res[0] . "\n";
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// Turn AUTOCOMMIT off
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db2_autocommit($conn, DB2_AUTOCOMMIT_OFF);
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// Delete all rows from ANIMALS
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db2_exec($conn, "DELETE FROM animals");
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$stmt = db2_exec($conn, "SELECT count(*) FROM animals");
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$res = db2_fetch_array( $stmt );
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echo $res[0] . "\n";
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// Roll back the DELETE statement
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db2_rollback( $conn );
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$stmt = db2_exec( $conn, "SELECT count(*) FROM animals" );
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$res = db2_fetch_array( $stmt );
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echo $res[0] . "\n";
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db2_close($conn);
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}
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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7
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0
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7
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]]>
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</screen>
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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><function>db2_autocommit</function></member>
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<member><function>db2_commit</function></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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