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大并发下，解决数据准确性

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大并发下，解决数据准确性

一条语句，就是插入时的验证条件
INSERT INTO vote_log(p_id, openid, status) select 216, '12313', 1 where (select count(*) from vote_log) <=3

在并发下，依然插入N条数据。


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mysql 自身无法达到你的需求

这条 sql 如果是做业务限制的话,改为前面加个缓存来处理这个逻辑.

如果这个 sql 不做业务限制,只是限制日志写入的话,加个队列,异步顺序处理也可以了.


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