MongoDB\Driver\WriteConcern::isDefault
(mongodb >=1.3.0)
MongoDB\Driver\WriteConcern::isDefault — Checks if this is the default write concern
Beschreibung
Returns whether this is the default write concern (i.e. no options are specified). This method is primarily intended to be used in conjunction with MongoDB\Driver\Manager::getWriteConcern() to determine whether the Manager has been constructed without any write concern options.
The driver will not include a default write concern in its write operations (e.g. MongoDB\Driver\Manager::executeBulkWrite()) in order to allow the server to apply its own default, which may have been » modified. Libraries that access the Manager's write concern to include it in their own write commands should use this method to ensure that default write concerns are left unset.
Parameter-Liste
Diese Funktion besitzt keine Parameter.
Rückgabewerte
Returns true if this is the default write concern and false otherwise.
Fehler/Exceptions
- Wirft eine MongoDB\Driver\Exception\InvalidArgumentException, wenn beim Analysieren von Argumenten ein Fehler auftritt.
Beispiele
Beispiel #1 MongoDB\Driver\WriteConcern::isDefault() example
<?php
$wc = new MongoDB\Driver\WriteConcern(1);
var_dump($wc->isDefault());
$manager = new MongoDB\Driver\Manager('mongodb://127.0.0.1/?w=majority');
$wc = $manager->getWriteConcern();
var_dump($wc->isDefault());
$manager = new MongoDB\Driver\Manager('mongodb://127.0.0.1/');
$wc = $manager->getWriteConcern();
var_dump($wc->isDefault());
?>Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
bool(false) bool(false) bool(true)
Siehe auch
- MongoDB\Driver\Manager::getWriteConcern() - Return the WriteConcern for the Manager
- » Modify Default Write Concern in the MongoDB manual
- » Write Concern reference
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