PHP Unconference Europe 2015

mysqlnd_ms_get_last_gtid

(PECL mysqlnd_ms >= 1.2.0)

mysqlnd_ms_get_last_gtidReturns the latest global transaction ID

Description

string mysqlnd_ms_get_last_gtid ( mixed $connection )

Returns a global transaction identifier which belongs to a write operation no older than the last write performed by the client. It is not guaranteed that the global transaction identifier is identical to that one created for the last write transaction performed by the client.

Parameters

connection

A PECL/mysqlnd_ms connection handle to a MySQL server of the type PDO_MYSQL, mysqli> or ext/mysql. The connection handle is obtained when opening a connection with a host name that matches a mysqlnd_ms configuration file entry using any of the above three MySQL driver extensions.

Return Values

Returns a global transaction ID (GTID) on success. Otherwise, returns FALSE.

The function mysqlnd_ms_get_last_gtid() returns the GTID obtained when executing the SQL statement from the fetch_last_gtid entry of the global_transaction_id_injection section from the plugins configuration file.

The function may be called after the GTID has been incremented.

Notes

Note:

mysqlnd_ms_get_last_gtid() requires PHP >= 5.4.0 and PECL mysqlnd_ms >= 1.2.0. Internally, it is using a mysqlnd library C functionality not available with PHP 5.3.

Please note, all MySQL 5.6 production versions do not provide clients with enough information to use GTIDs for enforcing session consistency. In the worst case, the plugin will choose the master only.

Examples

Example #1 mysqlnd_ms_get_last_gtid() example

<?php
/* Open mysqlnd_ms connection using mysqli, PDO_MySQL or mysql extension */
$mysqli = new mysqli("myapp""username""password""database");
if (!
$mysqli)
  
/* Of course, your error handling is nicer... */
  
die(sprintf("[%d] %s\n"mysqli_connect_errno(), mysqli_connect_error()));

/* auto commit mode, transaction on master, GTID must be incremented */
if (!$mysqli->query("DROP TABLE IF EXISTS test"))
  die(
sprintf("[%d] %s\n"$mysqli->errno$mysqli->error));

printf("GTID after transaction %s\n"mysqlnd_ms_get_last_gtid($mysqli));

/* auto commit mode, transaction on master, GTID must be incremented */
if (!$mysqli->query("CREATE TABLE test(id INT)"))
  die(
sprintf("[%d] %s\n"$mysqli->errno$mysqli->error));

printf("GTID after transaction %s\n"mysqlnd_ms_get_last_gtid($mysqli));
?>

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top