feat: add transaction-level read lock mode support #218
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Enables optionally setting the read lock mode at a transaction-level to
either `OPTIMISTIC` or `PESSIMISTIC`. If the read lock mode is not set,
Spanner will select the default read lock mode based on the isolation
level of the transaction.
- If the isolation level is `SERIALIZABLE`, then `PESSIMISTIC` locking
is the default.
- If the isolation level is `REPEATABLE READ`, then `OPTIMISTIC`
locking is the default.
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Discussed internally and we have decided to close this PR in favor of official Spanner CLI. |
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Enables optionally setting the read lock mode at a transaction-level to either
OPTIMISTICorPESSIMISTIC. If the read lock mode is not set, Spanner will select the default read lock mode based on the isolation level of the transaction.SERIALIZABLE, thenPESSIMISTIClocking is the default.REPEATABLE READ, thenOPTIMISTIClocking is the default.