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MongoDB\Driver\ReadConcern::__construct - Construct immutable ReadConcern
Вернуться к: MongoDB\Driver\ReadConcern
MongoDB\Driver\ReadConcern::__construct
(mongodb >=1.0.0)
MongoDB\Driver\ReadConcern::__construct — Construct immutable ReadConcern
Описание
final public MongoDB\Driver\ReadConcern::__construct
([ string
$level
] )Creates a new ReadConcern.
Список параметров
-
level -
Read concern Value Description MongoDB\Driver\ReadConcern::LOCALQueries using this read concern will return the node's most recent copy of the data. This provides no guarantee that the data has been written to a majority of the nodes (i.e. it may be rolled back). This is the default read concern for MongoDB. MongoDB\Driver\ReadConcern::MAJORITYQueries using this read concern will return the node's most recent copy of the data confirmed as having been written to a majority of the nodes (i.e. the data cannot be rolled back).
Ошибки
- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
Примеры
Пример #1 MongoDB\Driver\ReadConcern::__construct() example
<?php
/* Unspecified read isolation level (uses the server's default behavior) */
$rc = new MongoDB\Driver\ReadConcern();
/* Request read isolation from a single replica set node */
$rc = new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::LOCAL);
/* Request read isolation from a majority of the replica set nodes */
$rc = new MongoDB\Driver\ReadConcern(MongoDB\Driver\ReadConcern::MAJORITY);
?>
Смотрите также
Вернуться к: MongoDB\Driver\ReadConcern