Merge remote-tracking branch 'origin/yangwu1.3' into 1.3nsq

chenshijun

2019-03-30 23bd97eaa5626ad96ca3f5d3e97e93d14705ca6d

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#include "BaseDao.h"
mysqlpp::Connection* BaseDao::conn = nullptr;
QMutex BaseDao::m_mutexVisit;