i tried to connect mysql db using c++. but, compile time i get no input file from compiler.how to solve this problem?

I recently had to cover this material in a class I’m teaching (like, last week) and it worked fine with Windows 7 and Visual Studio 2008 – so it must be a VS2010 thing.

This might help you out (but remember to get rid of the password if you’re using WAMP Server as by default there is no password for the root account): http://blog.ulf-wendel.de/?p=215#hello

then it spit out message like “Could not connect to database. Error message: Access denied for user ‘ODBC’@'localhost’ (using password: NO)”

I don’t know what is wrong with me.

Any advice will be appreciated.

Thanks.

I tested with: Windows 7 SP1 Pro x64 + MySQL x64 5.5.12 + VS 2010 SP1
(I converted the original project into VS 2011 project)

To run it in RELEASE model, I had to replace “mysqlcppconn.dll” and “mysqlcppconn.lib”.
(I extracted the files from “mysql-connector-c++-noinstall-1.1.0-win32.zip” at http://www.mologie.de/blog/2010/10/mysql-connector-c-und-visual-studio-2010/)

Did I do something wrong?

Was able to obtain VS 2008 Express and it works fine now.
Thanks for the help & the great sample code!

It sounds like you’re doing everything right – service is running, can see & connect to database from MySQL tools etc….

If you’re getting an unknown exception error (which I think is the error you’re referring to) then I’d have to guess that it’s got to be some kind of library mismatch – try getting a new version of Connector/C++ for Visual Studio 2010 and substitute in those dlls for any in the existing project. Also, the libs I provided with the precompiled project are 32-bit, if your system is 64-bit it’s not going to work.

Also if you separate out each line of “risky” code into its own separate try/catch block then you’ll know exactly which statement is failing, like this:

try
{
	cout << "About to try to USE mysql..." << endl;
	stmt->execute("USE mysql");
	cout << "USEd mysql without dying!" << endl;
}
catch (sql::SQLException e)
{
	cout << "SQLException on USE: " << e.what() <<endl;
	exit(-1);
}
catch (exception e)
{
	cout << "Generic exception on USE: " << e.what() << endl;
	exit(-1);
}
 
try
{
	cout << "About to try to show tables..." << endl;
	res = stmt->executeQuery("show tables"); 
	cout << "Showed tables without dying!" << endl;
}
catch (sql::SQLException e)
{
	cout << "SQLException on show tables: " << e.what() <<endl;
	exit(-1);
}
catch (exception e)
{
	cout << "Generic exception on show tables: " << e.what() << endl;
	exit(-1);
}

I followed your suggestions to her:
– Confirm the mysql service is running from the WAMP indicator in the bottom-right system tray,
– Confirm (via phpmyadmin) that a database called “mysql” exists.
– Can log in using “msql.exe -u root”, & issue “use mysql” & “show tables”
– Turned firewall off

I put some debug messages and it looks like the error happens when doing:
stmt->execute(“USE mysql”);

Everything compiled ok under MS VC++ 2010 Express (Release build).
I was going to try w/ 2008, but having trouble downloading it at the moment.
Would appreciate any help.
Thanks.

If you are building in Release mode and it’s still not working, then I’m not so sure. The connect to server catch block is triggering, i.e. this bit:

// Try to connect to the DBMS server
try
{
	dbConn = driver->connect(server, username, password);
}
catch (sql::SQLException e)
{
	cout << "Could not connect to database. Error message: " << e.what() << endl;
	system("pause");
	exit(1);
}

But, I’ve just tested the code with Visual Studio 2008 and I get:

Could not connect to database. Error message: Can’t connect to MySQL server on ’127.0.0.1′ (10061) – if the MySQL server isn’t running or is pointed at an bad address,
SQL error. Error message: Access denied for user ”@’localhost’ to database ‘mysql’ – if MySQL is running and we connect to it, but provide an invalid username, and
Could not connect to database. Error message: Access denied for user ‘root’@'localhost’ (using password: YES) – if MySQL is running and we connect but provide an invalid password.

Again, I think it’ll be a library thing and either an incompatibility with VS2010 (in which case perhaps you’ll need to get libraries compiled for VS2010), or you’re trying to run 32-bit libs on a 64-bit OS and it’s not liking it.

Best of luck & hope you get it sorted,
r3dux

Do you know the solution to it?