1.缺少驱动qt_mysql_driver
- Qt 5.15及之后版本缺少mysql驱动：qsqlmysql.dll、qsqlmysqld.dll
下载对应版本驱动：https://github.com/thecodemonkey86/qt_mysql_driver/releases?page=2 - 拷贝至Qt安装路径下，例如
Qt5.15.2\5.15.2\msvc2019_64\plugins\sqldrivers
2.缺少mysql驱动
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根据mysql版本下载对应mysql压缩包https://downloads.mysql.com/archives/community/
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找到libmysql.dll、libmysqld.dll、libmysql.lib、libmysqld.lib
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拷贝至Qt安装路径下，例如
Qt5.15.2\5.15.2\msvc2019_64\bin
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