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MySQL

   //--- use a QTextStream: it makes it easier to output ---
   //--- QString to cout.                                ---
   QTextStream cout(stdout, QIODevice::WriteOnly);

   //--- define the database connection ---
   QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
   db.setHostName("localhost");  // host
   db.setDatabaseName("qttest");            // database
   db.setUserName("qtuser");                // user
   db.setPassword("qtuser");               // password

   //--- attempt to open it ---
   bool ok = db.open();

   if ( ok ) {
       //--- we're good! ---
       cout << "Database open\n";

       //--- run a query and print data returned ---
       QSqlQuery query( "select * from address" );
       if ( !query.isActive() )
           cout << "Query Error" + query.lastError().text()
                << endl;
       else while (query.next()) {
               int Id = query.value(0).toInt();
               QString word = query.value(1).toString();
               cout << QString( "%1\t%2\n").arg( Id).arg( word );
               }

       //--- add a new entry to the table ---
       query.prepare( "INSERT INTO address (fname, lname) VALUES ( :word, :word ) ");
       query.bindValue( ":word", "Banana" );
       query.exec();

       //--- close connection to database
       db.close();
   }
   else
       //--- something went wrong ---
       cout << "Error opening database\n";
Quelle: http://cs.smith.edu/dftwiki/index.php/Qt4/Qt-Creator_Read_MySql_Table_%28Console_Mode%29

QT MySQL driver

Unter Ubuntu muss das Paket libqt4-sql-mysql mit sudo apt-get install libqt4-sql-mysql installiert werden.

Persönliche Werkzeuge