mysqlnd_qc_set_cache_condition
(PECL mysqlnd_qc >= 1.1.0)
mysqlnd_qc_set_cache_condition — Set conditions for automatic caching
Описание
$condition_type
,
mixed
$condition
,
mixed
$condition_option
) : boolSets a condition for automatic caching of statements which do not contain the necessary SQL hints to enable caching of them.
Список параметров
-
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 oncondition_typeIf
condition_typeequalsMYSQLND_QC_CONDITION_META_SCHEMA_PATTERNconditionmust 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 thedbandorg_tablemeta data entries provided by the underlying MySQL client server library. Please, check the MySQL Reference manual for details about the two entries. Thedbandorg_tablevalues are concatenated with a dot (.) before matched againstcondition. 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 oncondition_type.If
condition_typeequalsMYSQLND_QC_CONDITION_META_SCHEMA_PATTERNcondition_optionsis the TTL to be used.
Примеры
Пример #1 mysqlnd_qc_set_cache_condition() 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");
?>
Возвращаемые значения
Returns TRUE on success or FALSE on FAILURE.