mysqlnd_qc_set_cache_condition

(PECL mysqlnd_qc >= 1.1.0)

mysqlnd_qc_set_cache_condition — Set conditions for automatic caching

说明

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.

参数

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.

范例

Example #1 mysqlnd_qc_set_cache_condition() example

  <?php
 
 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" );
 
 $mysqli -> query ( "SELECT id, title FROM news" );

 $pdo_mysql  = new  PDO ( "mysql:host=host;dbname=db_example;port=port" ,  "user" ,  "password" );
 
 $pdo_mysql -> query ( "SELECT id, title FROM latest_news" );
 
 $pdo_mysql -> query ( "SELECT id, title FROM news" );
 ?>

返回值

Returns TRUE on success or FALSE on FAILURE.

参见

Quickstart: pattern based caching