Qt ODBC data source not found

[karankumar1609]

Hello all,
Currently i am working on a project in which i have to connect MySQL database through ODBC.
Operating system : CentOS

the problem i am facing is, whenever i execute the aplication it says

[unixODBC][Driver Manager]Data source name not found, and no default driver specified QODBC3: Unable to connect

database_manager_ = QSqlDatabase::addDatabase("QODBC3", "test_qt");
    database_manager_.setDatabaseName("Server=localhost;Database=test_qt;user=karan;password=karan;");
    database_manager_.setHostName("localhost");
    database_manager_.setUserName("karan");
    database_manager_.setPassword("karan");

database_manager_ = QSqlDatabase::addDatabase("QODBC3", "test_qt");
    database_manager_.setDatabaseName("Server=localhost;Database=test_qt;user=karan;password=karan;");
    database_manager_.setHostName("localhost");
    database_manager_.setUserName("karan");
    database_manager_.setPassword("karan");

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searched a lot on google but not found any successfull solution.
Please help..