Class ReadWrite (3.51.0)

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ReadWrite(mapping=None, *, ignore_unknown_fields=False, **kwargs)

Message type to initiate a read-write transaction. Currently this transaction type has no options.

Attributes
Name	Description
read_lock_mode	google.cloud.spanner_v1.types.TransactionOptions.ReadWrite.ReadLockMode Read lock mode for the transaction.
multiplexed_session_previous_transaction_id	bytes Optional. Clients should pass the transaction ID of the previous transaction attempt that was aborted if this transaction is being executed on a multiplexed session. This feature is not yet supported and will result in an UNIMPLEMENTED error.

Classes

ReadLockMode

ReadLockMode(value)

ReadLockMode is used to set the read lock mode for read-write transactions.

    If the value is not specified, the pessimistic
    read lock is used.
PESSIMISTIC (1):
    Pessimistic lock mode.

    Read locks are acquired immediately on read.
OPTIMISTIC (2):
    Optimistic lock mode.

    Locks for reads within the transaction are not
    acquired on read. Instead the locks are acquired
    on a commit to validate that read/queried data
    has not changed since the transaction started.