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.