Copyright 1997-2018 the PHP Documentation Group.
mysqlnd_ms_get_last_gtid
Returns 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
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
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 7.299 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));
?>
See Also
Global Transaction IDs |