Connection With database

[sudheer168]

Hi every body ,
I am using Qt4.4.3 , VS2005 . I wrote a code to connect to database . The is as follows .

QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
	db.setDatabaseName("appolice");
	db.setHostName("localhost");
	db.setUserName("root");
	db.setPassword("root");
	db.setPort(3307);
	if(!db.open())
		QMessageBox::information(this,"","Database Connection Failed");

QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
	db.setDatabaseName("appolice");
	db.setHostName("localhost");
	db.setUserName("root");
	db.setPassword("root");
	db.setPort(3307);
	if(!db.open())
		QMessageBox::information(this,"","Database Connection Failed");

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I create one QT GUI app and used this code to connect to database , I am able to connect . But I created one more new Qt GUI app where I used same code to connect to data base but it is not able to connect . I didn't get why it is connecting in one application and why it is failed to connect in another application.
Please help me to make connect .

Regards,
Sudheer.