MongoDB\Driver\WriteConcern::isDefault

(mongodb >=1.3.0)

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

说明

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.

参数

此函数没有参数。

返回值

Returns true if this is the default write concern and false otherwise.

错误／异常

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

范例

示例 #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());

?>

以上例程会输出：

bool(false)
bool(false)
bool(true)

参见

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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官方地址：https://www.php.net/manual/en/mongodb-driver-writeconcern.isdefault.php

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MongoDB\Driver\WriteConcern::isDefault

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes