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mysql一条语句执行有就修改没有就插入的操作

来源：互联网 
I must say, I really wish I knew about this technique years ago – before I started using frameworks to do a lot of my development.  The effort that was wasted in building separate code and separate logic to deal with inserts vs updates, when all of this time, there is a nice and simple feature built-in to Mysql that does this for us…I must say, I really wish I knew about this techni

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