Php/docs/mongodb-driver-manager.getreadpreference
MongoDB\Driver\Manager::getReadPreference
(mongodb >=1.0.0)
MongoDB\Driver\Manager::getReadPreference — Return the ReadPreference for the Manager
说明
final public MongoDB\Driver\Manager::getReadPreference ( ) : MongoDB\Driver\ReadPreference
Returns the MongoDB\Driver\ReadPreference for the Manager, which is derived from its URI options. This is the default read preference for queries and commands executed on the Manager.
参数
此函数没有参数。
范例
Example #1 MongoDB\Driver\Manager::getReadPreference() example
<?php$manager = new MongoDB\Driver\Manager('mongodb://localhost:27017');var_dump($manager->getReadPreference());$manager = new MongoDB\Driver\Manager('mongodb://localhost:27017/?readPreference=secondaryPreferred&readPreferenceTags=dc:ny,rack:1&readPreferenceTags=dc:ny&readPreferenceTags=');var_dump($manager->getReadPreference());?>
以上例程的输出类似于:
object(MongoDB\Driver\ReadPreference)#2 (1) { ["mode"]=> string(7) "primary" } object(MongoDB\Driver\ReadPreference)#1 (2) { ["mode"]=> string(18) "secondaryPreferred" ["tags"]=> array(3) { [0]=> object(stdClass)#3 (2) { ["dc"]=> string(2) "ny" ["rack"]=> string(1) "1" } [1]=> object(stdClass)#4 (1) { ["dc"]=> string(2) "ny" } [2]=> object(stdClass)#5 (0) { } } }