The MongoDB\Driver\ReadPreference class

(mongodb >=1.0.0)

简介

final MongoDB\Driver\ReadPreference {

/* Constants */

const integer RP_PRIMARY = 1 ;

const integer RP_PRIMARY_PREFERRED = 5 ;

const integer RP_SECONDARY = 2 ;

const integer RP_SECONDARY_PREFERRED = 6 ;

const integer RP_NEAREST = 10 ;

/* 方法 */

final public __construct ( string $mode [, array $tagSets ] )

final public integer getMode ( void )

final public array getTagSets ( void )

}

MongoDB\Driver\ReadPreference::RP_PRIMARY: All operations read from the current replica set primary. This is the default read preference for MongoDB.
MongoDB\Driver\ReadPreference::RP_PRIMARY_PREFERRED: In most situations, operations read from the primary but if it is unavailable, operations read from secondary members.
MongoDB\Driver\ReadPreference::RP_SECONDARY: All operations read from the secondary members of the replica set.
MongoDB\Driver\ReadPreference::RP_SECONDARY_PREFERRED: In most situations, operations read from secondary members but if no secondary members are available, operations read from the primary.
MongoDB\Driver\ReadPreference::RP_NEAREST: Operations read from member of the replica set with the least network latency, irrespective of the member's type.

MongoDB\Driver\ReadPreference::__construct — Construct immutable ReadPreference
MongoDB\Driver\ReadPreference::getMode — Returns the ReadPreference's "mode" option
MongoDB\Driver\ReadPreference::getTagSets — Returns the ReadPreference's "tagSets" option