Error: Failed to connect database.Driver not loaded Driver not loaded

Qt打包好的程序报错：Error: Failed to connect database.Driver not loaded Driver not loaded

后经排查，发现需要把Qt    msvc2015_64\plugins\sqldrivers      文件夹拷贝到程序目录下，sqldrivers目录。

运行程序，错误消除。

Succeed to connect database.

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Error: Failed to connect database.Driver not loaded Driver not loaded