(mongodb >=1.4.0)

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


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.

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

Elenco dei parametri


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.

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.

Option Type Description
maxCommitTimeMS integer

The maximum amount of time in milliseconds to allow a single commitTransaction command to run.

If specified, maxCommitTimeMS must be a signed 32-bit integer greater than or equal to zero.

readConcern MongoDB\Driver\ReadConcern

A read concern to apply to the operation.

This option is available in MongoDB 3.2+ and will result in an exception at execution time if specified for an older server version.

readPreference MongoDB\Driver\ReadPreference

A read preference to use for selecting a server for the operation.

writeConcern MongoDB\Driver\WriteConcern

A write concern to apply to the operation.

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.


Valori restituiti

Returns a MongoDB\Driver\Session.


Log delle modifiche

Versione Descrizione
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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