mysqlnd_qc_set_cache_condition(3) [php man page]

MYSQLND_QC_SET_CACHE_CONDITION(3)					 1					 MYSQLND_QC_SET_CACHE_CONDITION(3)

mysqlnd_qc_set_cache_condition - Set conditions for automatic caching

SYNOPSIS

       bool mysqlnd_qc_set_cache_condition (int  $condition_type, mixed  $condition, mixed  $condition_option)

DESCRIPTION

	Sets a condition for automatic caching of statements which do not contain the necessary SQL hints to enable caching of them.

PARAMETERS

	      o $condition_type
		- Type of the condition. The only allowed value is MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN.

	      o $condition
		-  Parameter  for  the	condition set with condition_type. Parameter type and structure depend on condition_type If condition_type
		equals MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN condition must be a string. The string sets a pattern. Statements  are	cached	if
		table  and  database  meta  data  entry of their result sets match the pattern. The pattern is checked for a match with the db and
		org_table meta data entries provided by the underlying MySQL client server library. Please, check the MySQL Reference  manual  for
		details about the two entries. The db and org_table values are concatenated with a dot ( .) before matched against condition. Pat-
		tern matching supports the wildcards % and _. The wildcard % will match one or many arbitrary characters.  _ will match one  arbi-
		trary character. The escape symbol is backslash.

	      o $condition_option
		-   Option   for   condition.	Type   and  structure  depend  on  condition_type.   If  condition_type  equals  MYSQLND_QC_CONDI-
		TION_META_SCHEMA_PATTERN condition_options is the TTL to be used.

EXAMPLES

       Example #1

	      mysqlnd_qc_set_cache_condition(3) example

	      <?php
	      /* Cache all accesses to tables with the name "new%" in schema/database "db_example" for 1 second */
	      if (!mysqlnd_qc_set_cache_condition(MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN, "db_example.new%", 1)) {
		die("Failed to set cache condition!");
	      }

	      $mysqli = new mysqli("host", "user", "password", "db_example", "port");
	      /* cached although no SQL hint given  */
	      $mysqli->query("SELECT id, title FROM news");

	      $pdo_mysql = new PDO("mysql:host=host;dbname=db_example;port=port", "user", "password");
	      /* not cached: no SQL hint, no pattern match */
	      $pdo_mysql->query("SELECT id, title FROM latest_news");
	      /* cached: TTL 1 second, pattern match */
	      $pdo_mysql->query("SELECT id, title FROM news");
	      ?>

RETURN VALUES

	Returns TRUE on success or FALSE on FAILURE.

SEE ALSO

       Quickstart: pattern based caching.

PHP Documentation Group 											 MYSQLND_QC_SET_CACHE_CONDITION(3)

MYSQLND_MEMCACHE_SET(3) 						 1						   MYSQLND_MEMCACHE_SET(3)

mysqlnd_memcache_set - Associate a MySQL connection with a Memcache connection

SYNOPSIS

       bool mysqlnd_memcache_set (mixed  $mysql_connection, [Memcached	$memcache_connection], [string	$pattern], [callback  $callback])

DESCRIPTION

	Associate  $mysql_connection  with $memcache_connection using $pattern as a PCRE regular expression, and $callback as a notification call-
       back 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 config-
       uration can be retrieved using mysqlnd_memcache_get_config(3).

PARAMETERS

	      o $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.

	      o $memcache_connection
		- A Memcached 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.

	      o $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 parameter is omitted or os set to NULL, then a default pattern will be used.

	      o $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 #1

	      mysqlnd_memcache_set(3) example with var_dump(3) 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(3).

PHP Documentation Group 												   MYSQLND_MEMCACHE_SET(3)