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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.