Cloud Spanner V1 Client - Class ReadLockMode (1.56.0)

Version 1.56.0

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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

Methods

name

Parameter
Name	Description
value	mixed

value

Parameter
Name	Description
name	mixed

Constants

READ_LOCK_MODE_UNSPECIFIED

Value: 0

Default value.

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

Generated from protobuf enum READ_LOCK_MODE_UNSPECIFIED = 0;

PESSIMISTIC

Value: 1

Pessimistic lock mode.

Read locks are acquired immediately on read.

Generated from protobuf enum PESSIMISTIC = 1;

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.

Generated from protobuf enum OPTIMISTIC = 2;