A standardardized pessimistic lock manager.

一个标准化的悲观锁（pessimistic lock）管理器。

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Lock the entire table before saving (pessimistic locking).

保存(悲观锁)之前锁定整个表。

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Lock the entire table before saving (pessimistic locking).

保存(悲观锁)之前锁定整个表。

youdao