I'm trying connect MS SQL server but errors :

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

This code:

Qt Code: 
  1. #include <QFile>
  2. #include <QTextStream>
  3. #include <QApplication> /* this normally is needed in the framework */
  4. #include <QMessageBox>	/* do not use for command line application */
  5. #include <QOCIDriver>	/* the Oracle driver */
  6. #include <QSqlDatabase>	/* for setting up the connection */
  7. #include <QSqlError>	/* for getting more human readable errors */
  8. #include <QSqlQuery>
  9. #include <QtDebug>
  10.  
  11. int main( int argc, char **argv )
  12. {
  13. 	QFile file( "ConnectString.con" );//My file connectString.con content is: localhost mydatabase sa sa
  14. 				  if( !file.open( QIODevice::ReadOnly | QIODevice::Text ) )
  15. 				    qFatal( "Could not open the file" );
  16.  
  17.  
  18.  
  19. 				  QTextStream stream( &file );
  20. 				  QString server ;
  21. 				  QString database;
  22. 				  QString username;
  23. 				  QString pass;
  24. 				  while( !stream.atEnd() )
  25. 				  {
  26. 					      			    			   stream >> server;  // read from file exactly: localhost
  27. 					      			    			   //qDebug() << server;
  28. 					      			    			   stream >> database;
  29. 					      			    			  // qDebug() << database;
  30. 					      			    			   stream >> username;  //read from file exactly: sa
  31. 					      			    			  // qDebug() << username;
  32. 					      			    			   stream >> pass;   //read from file exactly: sa
  33. 					      			    			  // qDebug() << pass;
  34.  
  35. 					      			    			   break;
  36. 				  }
  37.  
  38. QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");
  39. 				db.setDatabaseName("DRIVER={SQL Server};SERVER='"+server+"';DATABASE='"+database+"';UID='"+username+"';PWD='"+pass+"';Trusted_Connection=Yes");
  40. 				db.setDatabaseName(database);
  41. 				db.setPassword(pass);
  42. 				db.setHostName(server);
  43. 				db.setUserName(username);
  44. 			if(!db.open())
  45. 				{
  46. 					qDebug()<<db.lastError().text();
  47.  
  48.  
  49. 				}
  50. 			else
  51. 				{
  52. 				qDebug()<<"connect success!";
  53. 				}
  54.   return 0;
  55. }
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But I use :
Qt Code: 
  1. QSqlDatabase db=QSqlDatabase::addDatabase("QODBC");
  2. 				db.setDatabaseName("DRIVER={SQL Server};SERVER=localhost;DATABASE=mydatabase;UID=sa;PWD=sa;Trusted_Connection=Yes");
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It connect success

Please help me...
Thanks.