mirror of
https://github.com/sigmasternchen/php-doc-en
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576aca40b5
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332856 c90b9560-bf6c-de11-be94-00142212c4b1
142 lines
4.3 KiB
XML
142 lines
4.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.mysqlnd-ms-get-last-gtid" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>mysqlnd_ms_get_last_gtid</refname>
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<refpurpose>Returns the latest global transaction ID</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>string</type>
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<methodname>mysqlnd_ms_get_last_gtid</methodname>
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<methodparam><type>mixed</type><parameter>connection</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns a global transaction identifier which belongs to a write operation no
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older than the last write performed by the client. It is not guaranteed that
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the global transaction identifier is identical to that one created for the
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last write transaction performed by the client.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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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 PECL/mysqlnd_ms connection handle to a MySQL server of the type
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<link linkend="ref.pdo-mysql">PDO_MYSQL</link>, <link linkend="book.mysqli">mysqli</link>> or
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<link linkend="book.mysql">ext/mysql</link>.
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The connection handle is obtained when opening a connection with
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a host name that matches a mysqlnd_ms configuration file
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entry using any of the above three MySQL driver extensions.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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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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Returns a global transaction ID (GTID) on success.
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Otherwise, returns &false;.
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</para>
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<para>
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The function <function>mysqlnd_ms_get_last_gtid</function> returns the
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GTID obtained when executing the SQL statement from
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the <literal>fetch_last_gtid</literal> entry of the
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<literal>global_transaction_id_injection</literal> section from
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the plugins configuration file.
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</para>
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<para>
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The function may be called after the GTID has been incremented.
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</para>
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</refsect1>
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<refsect1>
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&reftitle.notes;
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<note>
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<para>
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<function>mysqlnd_ms_get_last_gtid</function> requires
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PHP >= 5.4.0 and PECL mysqlnd_ms >= 1.2.0. Internally, it is using
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a <literal>mysqlnd</literal> library C functionality not available with PHP 5.3.
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</para>
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<para>
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Please note, all MySQL 5.6 production versions do not provide
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clients with enough information to use GTIDs for enforcing session consistency.
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In the worst case, the plugin will choose the master only.
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</para>
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</note>
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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><function>mysqlnd_ms_get_last_gtid</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/* Open mysqlnd_ms connection using mysqli, PDO_MySQL or mysql extension */
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$mysqli = new mysqli("myapp", "username", "password", "database");
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if (!$mysqli)
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/* Of course, your error handling is nicer... */
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die(sprintf("[%d] %s\n", mysqli_connect_errno(), mysqli_connect_error()));
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/* auto commit mode, transaction on master, GTID must be incremented */
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if (!$mysqli->query("DROP TABLE IF EXISTS test"))
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die(sprintf("[%d] %s\n", $mysqli->errno, $mysqli->error));
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printf("GTID after transaction %s\n", mysqlnd_ms_get_last_gtid($mysqli));
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/* auto commit mode, transaction on master, GTID must be incremented */
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if (!$mysqli->query("CREATE TABLE test(id INT)"))
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die(sprintf("[%d] %s\n", $mysqli->errno, $mysqli->error));
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printf("GTID after transaction %s\n", mysqlnd_ms_get_last_gtid($mysqli));
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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>
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<link linkend="mysqlnd-ms.gtid">Global Transaction IDs</link>
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</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:"~/.phpdoc/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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