MongoDB\Driver\WriteConcern::isDefault

(mongodb >=1.3.0)

MongoDB\Driver\WriteConcern::isDefault — Checks if this is the default write concern

Beschreibung

final public MongoDB\Driver\WriteConcern::isDefault ( ) : bool

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

  • Throws MongoDB\Driver\InvalidArgumentException on argument parsing errors.

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