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Go如何正确的使用mysql driver
https://www.jianshu.com/p/340eb943be2e
https://xiequan.info/go%E5%A6%82%E4%BD%95%E6%AD%A3%E7%A1%AE%E7%9A%84%E4%BD%BF%E7%94%A8mysql-driver/
https://blog.csdn.net/idwtwt/article/details/91345364 连接池的bug.
