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ReadLockMode(value)ReadLockMode is used to set the read lock mode for read-write
transactions.
Values: READ_LOCK_MODE_UNSPECIFIED (0): Default value.
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.