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.

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