qt5.5连接mysql 出现QMYSQL driver not loaded

我把MySQL Server 5.5\lib 中的libmysql.dll放到Qt安装的bin目录下,但测试的时候还会出现QMYSQL driver not loaded。请问这是什么原因

QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins

http://blog.csdn.net/m15814478834/article/details/49902077

同样问题,原先的办法没用

qt的编译器是几位的mysql的libmysql.dll就得是几位。不然还是会报错