我一般习惯这样写
pro中
CONFIG(release, debug|release){
    CONFIG += static
}
static{
    DEFINES += QT_PLUGIN_STATIC_LINK
    QTPLUGIN += qsqlodbc
    QTPLUGIN += qsqlite
}
在main.cpp中
#ifdef QT_PLUGIN_STATIC_LINK
    #include<QtPlugin>
    Q_IMPORT_PLUGIN(QSQLiteDriverPlugin)
    Q_IMPORT_PLUGIN(QODBCDriverPlugin)
#endif