(PECL mysqlnd_memcache >= 1.0.0)
mysqlnd_memcache_get_config — Returns information about the plugin configuration
This function returns an array containing all the mysqlnd_memcache related configuration attached to a MySQL connection. This includes MySQL the Memcache object provided via mysqlnd_memcache_set() as well as the table mapping configuration which was automatically collected from the MySQL server.
If the connection is associated with a memcache connection an array will be returned. Otherwise this function will return false.
The returned array has these elements:
| 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 querying the server onthis connection. |
| pattern | Regular expression used to match an SQL query being 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 either is the default pattern, MYSQLND_MEMCACHE_DEFAULT_REGEXP or 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 associting a 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 mappings element. |
| Array Key | Description |
|---|---|
| prefix | A prefix used while accessing data via memcache. With the MySQL InnoDB Memcache Deamon plugin this usully begins with @@ and ends with a configurable separator. This prefix is placed in front of the key value while using the memcache protocol. |
| schema_name | Name of the schema (database) which contains the table being accessed. |
| table_name | Name of the table which contins the data accessible via memcache protocol. |
| id_field_name | Name of the database field (column) with the id used as key when accessing the table vi a memcache. Often this is the database field having a primary key. |
| separator |
A seprator used to split different field values. This is needed as
memcache only provides access to a single value while MySQL can map
multiple columns to this value.
|
| fields | An array with the names of all fields availle forthis mapping. |
Przykład #1 mysqlnd_memcache_get_config() example
<?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));
?>
Powyższy przykład wyświetli:
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"
}