MongoDB\Driver\Manager::getReadPreference
(mongodb >=1.0.0)
MongoDB\Driver\Manager::getReadPreference — Return the ReadPreference for the Manager
Descrierea
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.
Parametri
Această funcție nu are parametri.
Valorile întoarse
The MongoDB\Driver\ReadPreference for the Manager.
Erori/Excepții
- Emite MongoDB\Driver\Exception\InvalidArgumentException în cazul erorilor la interpretarea argumentelor.
Exemple
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());
?>
Exemplul de mai sus va afișa ceva similar cu:
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) {
}
}
}
A se vedea și
- MongoDB\Driver\ReadPreference
- MongoDB\Driver\Manager::__construct() - Create new MongoDB Manager
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