Cloud Spanner V1 Client - Class ReadLockMode (1.58.4)

Reference documentation and code samples for the Cloud Spanner V1 Client class ReadLockMode.

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

Protobuf type google.spanner.v1.TransactionOptions.ReadWrite.ReadLockMode

Default value.

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

Generated from protobuf enum READ_LOCK_MODE_UNSPECIFIED = 0;

Pessimistic lock mode.

Read locks are acquired immediately on read.

Generated from protobuf enum PESSIMISTIC = 1;

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.

Generated from protobuf enum OPTIMISTIC = 2;