Solution: QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins, qcoreapplication

Solution: QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins, qcoreapplication

When QSqlDatabase is used, the error QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins is reported because Qt does not know the directory of plugins.

Solution:

Before using the database, add the code QCoreApplication: addLibraryPath ("./plugins ");

The "./plugins" can be replaced with the directory where the actual plugins are located (the sqldrivers directory exists under the plugins level, and the dll under this directory is the library actually required by QSqlDatabase.