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TEMPLATE = app
TARGET =
DEPENDPATH += .
INCLUDEPATH += .
CONFIG += qt debug plugin
QT += sql
QTPLUGIN += qsqlmysql
# Input
HEADERS += qsql.h
SOURCES += main.cxx

#include <QApplication>
#include "qsql.h"
int main(int argc, char *argv[]){
        QApplication app(argc, argv);
        sqltmp db;
        return app.exec();
}

#ifndef aa_
#define aa_
#include <QSqlDatabase>
#include <QWidget>
class sqltmp : public QWidget {
        Q_OBJECT
        public:
                sqltmp(QWidget *parent=0):QWidget(parent){
                        QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
                }
};
#endif

an9bit@bithome% qmake-qt4 -spec freebsd-g++
an9bit@bithome%make
++ -c -pipe -g -Wall -W  -DQT_PLUGIN -DQT_SQL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/local/share/qt4/mkspecs/freebsd-g++ -I. -I/usr/local/include/QtCore -I/usr/local/include/QtCore -I/usr/local/include/QtGui -I/usr/local/include/QtGui -I/usr/local/include/QtSql -I/usr/local/include/QtSql -I/usr/local/include -I. -I. -I. -I/usr/local/include -o main.o main.cxx
/usr/local/bin/moc-qt4 -DQT_PLUGIN -DQT_SQL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/local/share/qt4/mkspecs/freebsd-g++ -I. -I/usr/local/include/QtCore -I/usr/local/include/QtCore -I/usr/local/include/QtGui -I/usr/local/include/QtGui -I/usr/local/include/QtSql -I/usr/local/include/QtSql -I/usr/local/include -I. -I. -I. -I/usr/local/include qsql.h -o moc_qsql.cpp
c++ -c -pipe -g -Wall -W  -DQT_PLUGIN -DQT_SQL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/local/share/qt4/mkspecs/freebsd-g++ -I. -I/usr/local/include/QtCore -I/usr/local/include/QtCore -I/usr/local/include/QtGui -I/usr/local/include/QtGui -I/usr/local/include/QtSql -I/usr/local/include/QtSql -I/usr/local/include -I. -I. -I. -I/usr/local/include -o moc_qsql.o moc_qsql.cpp
c++ -pthread -o mysql main.o  moc_qsql.o    -L/usr/local/lib -lQtSql -L/usr/local/lib -pthread -pthread -lQtGui -L/usr/X11R6/lib -laudio -lXt -lpng -lSM -lICE -pthread -pthread -lXi -lXrender -lXrandr -lXfixes -lXcursor -lXinerama -lfreetype -lfontconfig -lXext -lX11 -lQtCore -lz -lm -pthread -lgthread-2.0 -lglib-2.0 -liconv -L/usr/local/lib/plugins/sqldrivers/ -lqsqlmysql
/usr/local/lib/plugins/sqldrivers//libqsqlmysql.so: undefined reference to `QMYSQLDriver::staticMetaObject'
/usr/local/lib/plugins/sqldrivers//libqsqlmysql.so: undefined reference to `vtable for QMYSQLDriver'
*** Error code 1

#include <QtSql>
#include <QApplication>
#include <QMessagebox>

bool createConnection();

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	if (!createConnection())
		return 1;

	return app.exec();
}


 
bool createConnection()
{
	QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
	db.setDatabaseName("base");
	db.setUserName("username");
	db.setPassword("password");
	if (!db.open()) {
		QMessageBox::critical(0, QObject::tr("Database Error"),
			db.lastError().text());
		return false;
	}
	return true;
}