Solution: Qsqldatabase:an instance of qcoreapplication is required for loading driver plugins

Error encountered while using Qsqldatabase Qsqldatabase:an instance of qcoreapplication is required for loading driver Plugins is because QT does not know the directory where plugins is located.

Workaround:

Add code Qcoreapplication::addlibrarypath ("./plugins") before using the database;

The "./plugins" can be replaced with the directory where the actual plugins is located (the Sqldrivers directory is plugins subordinate, and the DLL in that directory is the library that qsqldatabase actually needs.