Class ReadWrite (3.46.0)

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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.

Attribute
Name	Description
read_lock_mode	google.cloud.spanner_v1.types.TransactionOptions.ReadWrite.ReadLockMode Read lock mode for the transaction.

Classes

ReadLockMode

ReadLockMode(value)

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

Enum values:

READ_LOCK_MODE_UNSPECIFIED (0):
    Default value.

    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.