Qt5.14.2 error connecting to the MySQL database of Ubuntu 20.04

Recently installed qt5.14.2 Connect ubuntu20.04 Of mysql Database time , With the driver installed (1. The driver is installed 2. The dynamic connection library has been copied ), The following problems still occur when connecting to the database ：
QSqlDatabase: MYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
mysql Version is ：mysql Ver 8.0.29-0ubuntu0.20.04.3 for Linux on x86_64 ((Ubuntu))
Download the mysql Dynamic connection Library ：mysql-8.0.29-winx64