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  QSqlDatabase mybase=QSqlDatabase::addDatabase("qsqlmysql");
   mybase.setDatabaseName("mybase");
   mybase.setUserName("root");
   mybase.setPassword("mypass");
   mybase.setHostName("127.0.0.1");
   mybase.open();
	QSqlQuery query("SELECT * FROM field1");
	int k=0;
     while (query.next()) {
		 QPixmap pixmap;
		 pixmap.loadFromData(query.record().value("Icon").toByteArray());
		 QString country = query.record().value("Name").toString();
		 k++;
     }
	 QSqlError er = mybase.lastError();

You need to get the MySQL installation files. Run SETUP.EXE and choose "Custom Install". 
Install the "Libs & Include Files" Module. Build the plugin as follows (here it is assumed that MySQL is installed in C:\MYSQL): 
    cd %QTDIR%\src\plugins\sqldrivers\mysql 
    qmake -o Makefile "INCLUDEPATH+=C:\MYSQL\INCLUDE" "LIBS+=C:\MYSQL\LIB\OPT\LIBMYSQL.LIB" mysql.pro 
    nmake 
If you are not using a Microsoft compiler, replace nmake with make in the line above.