1213 - Deadlock found when trying to get lock; try restarting transaction 出现这个原因要记住一点就是：innodb的行锁 和解锁都是针对主键索引的。如果查询时根据索引锁表，但更新时却不是通过主键更新， 那么等待的解锁查询的进程将会报1213错误，程序里有可能返回一个null值
1213 - Deadlock found when trying to get lock; try restarting transaction
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