#include <iostream>
#include <QCoreApplication>
#include <QByteArray>
#include <QVariant>
#include <QSqlDatabase>
#include <QSqlQuery>

int main(int argc, char** argv)
{
	QCoreApplication app(argc, argv);

	QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL", "test");
	db.setHostName("host");
	db.setPort(5432);
	db.setDatabaseName("db");
	db.setUserName("user");
	db.setPassword("password");

	if (db.open())
	{
		QByteArray data(500000000, 'a');		// memory leak
		//QByteArray data(100000000, 'a');		// no memory leak

		QSqlQuery query(db);
		query.prepare("INSERT INTO testtable(field1) VALUES(?)");
		query.bindValue(0, data);

		try
		{
			query.exec();
		}
		catch (const std::bad_alloc& e)
		{
			std::cerr << "std::bad_alloc: " << e.what() << std::endl;
		}
		
		query.clear();
		db.close();
	}

	return 0;
}