MongoDB\Driver\ReadConcern::isDefault
(mongodb >=1.3.0)
MongoDB\Driver\ReadConcern::isDefault — Checks if this is the default read concern
Description
final public function MongoDB\Driver\ReadConcern::isDefault():
bool
Returns whether this is the default read concern (i.e. no options are
specified). This method is primarily intended to be used in conjunction with
MongoDB\Driver\Manager::getReadConcern() to determine
whether the Manager has been constructed without any read concern options.
The driver will not include a default read concern in its read operations
(e.g. MongoDB\Driver\Manager::executeQuery()) in order
to allow the server to apply its own default. Libraries that access the
Manager's read concern to include it in their own read commands should use
this method to ensure that default read concerns are left unset.
Parameters
This function has no parameters.
Return Values
Returns true if this is the default read concern and false otherwise.
Examples
Example #1 MongoDB\Driver\ReadConcern::isDefault() example
<?php
$rc = new MongoDB\Driver\ReadConcern(null);
var_dump($rc->isDefault());
$rc = new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::MAJORITY);
var_dump($rc->isDefault());
$manager = new MongoDB\Driver\Manager('mongodb://127.0.0.1/?readConcernLevel=majority');
$rc = $manager->getReadConcern();
var_dump($rc->isDefault());
$manager = new MongoDB\Driver\Manager('mongodb://127.0.0.1/');
$rc = $manager->getReadConcern();
var_dump($rc->isDefault());
?>
The above example will output:
bool(true)
bool(false)
bool(false)
bool(true)
MongoDB\Driver\ReadConcern::getLevel
MongoDB\Driver\ReadConcern