Cloud Spanner V1 API - Module Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite::ReadLockMode (v0.21.0)

Version 0.21.0

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Reference documentation and code samples for the Cloud Spanner V1 API module Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite::ReadLockMode.

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

Constants

READ_LOCK_MODE_UNSPECIFIED

value: 0
Default value.

If the value is not specified, the pessimistic read lock is used.

PESSIMISTIC

value: 1
Pessimistic lock mode.

Read locks are acquired immediately on read.

OPTIMISTIC

value: 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.