Qt5 MYSQL “open()” method return true even with wrong credentials

[Krakusekpl]

While writing a Qt5 application that uses QSqlDatabase with MySQL, I encountered a strange behavior when I try to connect to datebase. QSqlDatabase::open() returns true even with wrong username, password and port. That's my code:

QSqlDatabase DB = QSqlDatabase::addDatabase("QMYSQL", "Connection");
DB.setHostName(Interface.InputIP->text());
DB.setDatabaseName("connectdb");
DB.setPort(Interface.InputPort->value());
DB.setUserName(Interface.InputLog->text());
DB.setPassword(Interface.InputPass->text());
bool result = DB.open();
if(result)
	QMessageBox::information(0, "Success", "Connected");
else
	QMessageBox::information(0, "Error", DB.lastError().text());
DB.close();

What can be the reason?

[SGaist]

Hi and welcome to devnet,

Just a silly idea but, are you sure the database you are accessing is protected ?

[Krakusekpl]

I'll write differently.
If i write all credentials correctly i can connect to database, and method "open" return true which is proper behavior.
But, if i write all credentials incorrectly (without IP) or i try to connect to disabled database method "open" again return true.
If I use external application to connect to my database and it's works perfectly.

[SGaist]

Did you close the connection first ?

[Krakusekpl]

No, I close connection after try to connect and after conditional statement, as it is in the code in first post.