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Mysqlnd replication and load balancing plugin (
mysqlnd_ms
)
2556
/* ... */
}
The first argument of many
mysqlnd
methods is a C "object". For example, the first argument of the
connect() method is a pointer to
MYSQLND
. The struct MYSQLND represents a
mysqlnd
connection
object.
The
mysqlnd
connection object pointer can be compared to a standard I/O file handle. Like a standard
I/O file handle a
mysqlnd
connection object shall be linked to the userspace using the PHP resource
variable type.
From C to userspace and back
class proxy extends mysqlnd_plugin_connection {
public function connect($conn, $host, ...) {
/* "pre" hook */
printf("Connecting to host = '%s'\n", $host);
debug_print_backtrace();
return parent::connect($conn);
}
public function query($conn, $query) {
/* "post" hook */
$ret = parent::query($conn, $query);
printf("Query = '%s'\n", $query);
return $ret;
}
}
mysqlnd_plugin_set_conn_proxy(new proxy());
PHP users must be able to call the parent implementation of an overwritten method.
As a result of subclassing it is possible to refine only selected methods and you can choose to have
"pre" or "post" hooks.
Buildin class: mysqlnd_plugin_connection::connect()
/* my_mysqlnd_plugin_classes.c */
PHP_METHOD("mysqlnd_plugin_connection", connect) {
/* ... simplified! ... */
zval* mysqlnd_rsrc;
MYSQLND* conn;
char* host; int host_len;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rs",
&mysqlnd_rsrc, &host, &host_len) == FAILURE) {
RETURN_NULL();
}
ZEND_FETCH_RESOURCE(conn, MYSQLND* conn, &mysqlnd_rsrc, -1,
"Mysqlnd Connection", le_mysqlnd_plugin_conn);
if (PASS == org_methods.connect(conn, host, /* simplified! */ TSRMLS_CC))
RETVAL_TRUE;
else
RETVAL_FALSE;
}
20.7.6. Mysqlnd replication and load balancing plugin (
mysqlnd_ms
)
Copyright 1997-2012 the PHP Documentation Group. [2230]
The mysqlnd replication and load balancing plugin (
mysqlnd_ms
) adds easy to use MySQL replication
support to all PHP MySQL extensions that use
mysqlnd
.
As of version PHP 5.3.3 the MySQL native driver for PHP (
mysqlnd
) features an internal plugin C API.
C plugins, such as the replication and load balancing plugin, can extend the functionality of
mysqlnd
.
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