Isolation.REPEATABLE_READ
mysql默认级别， 仅次于Isolation.SERIALIZABLE
Isolation.SERIALIZABLE:
别人无法update 否则: Deadlock found when trying to get lock; try restarting transaction
mysql默认级别， 仅次于Isolation.SERIALIZABLE
Isolation.SERIALIZABLE:
别人无法update 否则: Deadlock found when trying to get lock; try restarting transaction
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