(PECL mysqlnd_memcache >= 1.0.0)
mysqlnd_memcache_set — Associate a MySQL connection with a Memcache connection
$mysql_connection
[, Memcached $memcache_connection
[, string $pattern
[, callback $callback
]]] )
Associate mysql_connection with
memcache_connection using pattern
as decision Regexp and callback as notification
callback or unset the association of mysql_connection.
While associating a MySQL connection with a Memcache connection this function will query the MySQL server for its configuration. It will automatically detect whether the server is configured to use the InnoDB Memcache Daemon Plugin or MySQL Cluster NDB Memcache support. It will also query the server to automatically identify exported tables and other configuration options. The results of this automatic configuration can be retrieved using mysqlnd_memcache_get_config().
mysql_connection
A handle to a MySQL server of the type PDO_MYSQL, mysqli or ext/mysql for which the configuration is to be set.
memcache_connection
A Memcached instance with an
connection to the MySQL Memcache Daemon plugin. If this parameter
is ommitted mysql_connection will be unassociated
from any memcache connection. If a previous association exists it will be
replaced.
pattern
A regular expression in Perl Compatible
Regular Expression syntax used to identify potential
Memcache-queries. The query should have three sub patterns. The
first subpattern contains the requested field list, the second the name
of the ID column from the query and the third the requested value. If
this parameteris ommitted or set to NULL a default
pattern will be used.
callback
A callback which will be used whenever a query is being sent to MySQL. The callback will receive a single boolean parameter telling if a query was sent via Memcache.
If the association or disassociation succeds the function returns TRUE. In
case of an error FALSE is being returned.
Przykład #1 mysqlnd_memcache_set() example with var_dump() as simple debugging callabck.
<?php
$mysqli = new mysqli("host", "user", "passwd", "database");
$memc = new Memcached();
$memc->addServer("host", 11211);
mysqlnd_memcache_set($mysqli, $memc, NULL, 'var_dump');
/* This query will be intercepted and executed via Memcache protocol */
echo "Sending query for id via Memcache: ";
$mysqli->query("SELECT f1, f2, f3 FROM test WHERE id = 1");
/* f1 is not configured as valid key field, this won't be sent via Memcache */
echo "Sending query for f1 via Memcache: ";
$mysqli->query("SELECT id FROM test WHERE f1 = 1");
mysqlnd_memcache_set($mysqli);
/* Now the regular MySQL protocol will be used */
echo "var_dump won't be invoked: ";
$mysqli->query("SELECT f1, f2, f3 WHERE id = 1");
?>
Powyższy przykład wyświetli:
Sending query for id via Memcache: bool(true) Sending query for f1 via Memcache: bool(false) var_dump won't be invoked: