Php/docs/function.mysqlnd-memcache-get-config
mysqlnd_memcache_get_config
(PECL mysqlnd_memcache >= 1.0.0)
mysqlnd_memcache_get_config — Returns information about the plugin configuration
说明
mysqlnd_memcache_get_config
( mixed $connection
) : array
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.
参数
connection- A handle to a MySQL Server using one of the MySQL API extensions for PHP, which are PDO_MYSQL, mysqli or ext/mysql.
返回值
An array of mysqlnd_memcache configuration information on success, otherwise 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 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
( |
| 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 mappings element. |
| Array Key | Description |
|---|---|
| prefix | A prefix used while accessing data via memcache. With the MySQL InnoDB
Memcache Deamon plugin, this usually 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 contains 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 via memcache. Often this is the database field having a primary key. |
| separator |
The separator used to split the 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 name of all fields available for this mapping. |
范例
Example #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));?>
以上例程会输出：
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"
}
