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mysqlnd_qc_set_cache_condition

(PECL mysqlnd_qc >= 1.1.0)

mysqlnd_qc_set_cache_conditionSet conditions for automatic caching

Description

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

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

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Parameters

condition_type

Type of the condition. The only allowed value is MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN.

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. Pattern matching supports the wildcards % and _. The wildcard % will match one or many arbitrary characters. _ will match one arbitrary character. The escape symbol is backslash.

condition_option

Option for condition. Type and structure depend on condition_type.

If condition_type equals MYSQLND_QC_CONDITION_META_SCHEMA_PATTERN condition_options is the TTL to be used.

Examples

<?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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