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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.
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.