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MongoDB\Driver\Manager::startSession

(mongodb >=1.4.0)

MongoDB\Driver\Manager::startSessionStart a new client session for use with this client

Опис

final public MongoDB\Driver\Manager::startSession(?array $options = null): MongoDB\Driver\Session

Creates a MongoDB\Driver\Session for the given options. The session may then be specified when executing commands, queries, and write operations.

Зауваження: A MongoDB\Driver\Session can only be used with the MongoDB\Driver\Manager from which it was created.

Параметри

options

options
Option Type Description Default
causalConsistency bool

Configure causal consistency in a session. If true, each operation in the session will be causally ordered after the previous read or write operation. Set to false to disable causal consistency.

See » Casual Consistency in the MongoDB manual for more information.

true
defaultTransactionOptions array

Default options to apply to newly created transactions. These options are used unless they are overridden when a transaction is started with different value for each option.

options
Option Type Description
maxCommitTimeMS int

Час (у мілісекундах), що відводиться на виконання однієї команди commitTransaction.

Параметр maxCommitTimeMS повинен бути знаковим 32-бітним цілим числом, що рівне або більше за нуль.

readConcern MongoDB\Driver\ReadConcern

Вимога щодо зчитування.

Цей параметр доступний в MongoDB 3.2+, тож його застосування у старіших версіях викине виключення під час виконання.

readPreference MongoDB\Driver\ReadPreference

Параметр читання для вибору сервера для операції.

writeConcern MongoDB\Driver\WriteConcern

Вимога щодо запису.

This option is available in MongoDB 4.0+.

[]
snapshot bool

Configure snapshot reads in a session. If true, a timestamp will be obtained from the first supported read operation in the session (i.e. find, aggregate, or unsharded distinct). Subsequent read operations within the session will then utilize a "snapshot" read concern level to read majority-committed data from that timestamp. Set to false to disable snapshot reads.

Snapshot reads require MongoDB 5.0+ and cannot be used with causal consistency, transactions, or write operations. If "snapshot" is true, "causalConsistency" will default to false.

See » Read Concern "snapshot" in the MongoDB manual for more information.

false

Значення, що повертаються

Returns a MongoDB\Driver\Session.

Помилки/виключення

Журнал змін

Версія Опис
PECL mongodb 1.11.0

The "snapshot" option was added.

PECL mongodb 1.6.0

The "maxCommitTimeMS" option was added to "defaultTransactionOptions".

PECL mongodb 1.5.0

The "defaultTransactionOptions" option was added.

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