Spec-Zone .ru
спецификации, руководства, описания, API
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Spec-Zone .ru
спецификации, руководства, описания, API
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Copyright 1997-2012 the PHP Documentation Group.
Copyright 1997-2012 the PHP Documentation Group.
mysqlnd_memcache_get_config
Returns information about the plugin configuration
Description
array mysqlnd_memcache_get_config(mixed connection);
This function returns an array of all mysqlnd_memcache related configuration information that is attached to
the MySQL connection. This includes MySQL, the Memcache object provided via mysqlnd_memcache_set, and the table mapping configuration that was
automatically collected from the MySQL Server.
Parameters
Return Values
An array of mysqlnd_memcache configuration information on success, otherwise FALSE .
The returned array has these elements:
Table 22.82. mysqlnd_memcache_get_configarray
structure
| Array Key | Description |
|---|---|
| memcached | Instance of Memcached associated to this MySQL connection by mysqlnd_memcache_set. You can use this to change settings of
the memcache connection, or directly by querying the server on this connection.
|
| pattern | The PCRE regular expression used to match the SQL query sent to the server. Queries matching
this pattern will be further analyzed to decide whether the query can be intercepted and
sent via the memcache interface or whether the query is sent using the general MySQL
protocol to the server. The pattern is either the default pattern (MYSQLND_MEMCACHE_DEFAULT_REGEXP)
or it is set via mysqlnd_memcache_set.
|
| mappings | An associative array with a list of all configured containers as they were discovered by
this plugin. The key for these elements is the name of the container in the MySQL
configuration. The value is described below. The contents of this field is created by
querying the MySQL Server during association to MySQL and a memcache connection using mysqlnd_memcache_set.
|
| mapping_query | An SQL query used during mysqlnd_memcache_set to identify the available containers
and mappings. The result of that query is provided in the mappingselement.
|
Examples
Example 22.396. mysqlnd_memcache_get_configexample
<?php$mysqli = new mysqli("host", "user", "passwd", "database");$memc = new Memcached();$memc->addServer("host", 11211);mysqlnd_memcache_set($mysqli, $memc);var_dump(mysqlnd_memcache_get_config($mysqli));?>
The above example will output:
array(4) { ["memcached"]=> object(Memcached)#2 (0) { } ["pattern"]=> string(125) "/^\s*SELECT\s*(.+?)\s*FROM\s*`?([a-z0-9_]+)`?\s*WHERE\s*`?([a-z0-9_]+)`?\s*=\s*(?(?=["'])["']([^"']*)["']|([0-9e\.]*))\s*$/is" ["mappings"]=> array(1) { ["mymem_test"]=> array(6) { ["prefix"]=> string(13) "@@mymem_test." ["schema_name"]=> string(4) "test" ["table_name"]=> string(10) "mymem_test" ["id_field_name"]=> string(2) "id" ["separator"]=> string(1) "|" ["fields"]=> array(3) { [0]=> string(2) "f1" [1]=> string(2) "f2" [2]=> string(2) "f3" } } } ["mapping_query"]=> string(209) " SELECT c.name, CONCAT('@@', c.name, (SELECT value FROM innodb_memcache.config_options WHERE name = 'table_map_delimiter')) AS key_prefix, c.db_schema, c.db_table, c.key_columns, c.value_columns, (SELECT value FROM innodb_memcache.config_options WHERE name = 'separator') AS sep FROM innodb_memcache.containers c"}
See Also
mysqlnd_memcache_set
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Copyright 1997-2012 the PHP Documentation Group.
mysqlnd_memcache_set
Associate a MySQL connection with a Memcache connection
Description
bool mysqlnd_memcache_set(mixed mysql_connection,
Memcached memcache_connection,
string pattern,
callback callback);
Associate mysql_connection with memcache_connection
using pattern as a PCRE regular expression, and callback as a notification callback or to 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.
Parameters
mysql_connection A handle to a MySQL Server using one of the MySQL API extensions for PHP, which are PDO_MYSQL, mysqli or ext/mysql.
memcache_connection
A instance
with a connection to the MySQL Memcache Daemon plugin. If this parameter is omitted, then mysql_connection will be unassociated from any memcache
connection. And if a previous association exists, then it will be replaced.
pattern A regular expression in 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 parameter is
omitted or os set to NULL , then 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.
Return Values
TRUE if the association or disassociation is successful, otherwise FALSE if there is an error.
Examples
Example 22.397. mysqlnd_memcache_set
example with as
a simple debugging callback.
<?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");?>
The above example will output:
Sending query for id via Memcache: bool(true)Sending query for f1 via Memcache: bool(false)var_dump won't be invoked:
See Also
mysqlnd_memcache_get_config
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