Merge remote-tracking branch 'origin/yw.1.2.fixbug' into yw.1.2

pansen

2019-03-15 e2ec42921840535c445e40b76661d0ffd9baef8f

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