Class ReadLockMode (3.46.0)

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ReadLockMode(value)

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

Enum 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.