参数

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 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.	false