Russian Qt Forum

class DatabaseAccessor
 {
public:
     static DatabaseAccessor* getInstance();
     static QString dbHost;
     static QString dbName;
     static QString dbUser;
     static QString dbPass;

public slots:
     void executeSqlQuery(QString);
     void validateUser(QString, QString);

private:

     DatabaseAccessor();
     DatabaseAccessor(const DatabaseAccessor& );
     DatabaseAccessor& operator=(const DatabaseAccessor& );
     QSqlDatabase db;
 };

class DatabaseAccessor:public QObject
 {
Q_OBJECT
public:
     static DatabaseAccessor* getInstance();
     static QString dbHost;
     static QString dbName;
     static QString dbUser;
     static QString dbPass;
private:

     DatabaseAccessor();
     DatabaseAccessor(const DatabaseAccessor& );
     DatabaseAccessor& operator=(const DatabaseAccessor& );
     QSqlDatabase db;
 };

DatabaseAccessor::DatabaseAccessor(QObject *parent)               
 {
     DatabaseAccessor::dbHost="localhost";
     db=QSqlDatabase::addDatabase("QMYSQL");
     db.setHostName(dbHost);
     db.setDatabaseName(dbName);
     db.setUserName(dbUser);
     db.setPassword(dbPass);
     if (db.open())
     {
         qDebug("connected to database");
     }
     else
     {
         qDebug("Error occured in connection to database");
     }
 }

int main(int argc, char **argv) {
    QCoreApplication app(argc, argv);
    DatabaseAccessor::dbHost="localhost";
    DatabaseAccessor::getInstance();

void EchoServer::incomingConnection(int socketDescriptor) {
    EchoThread *thread = new EchoThread(socketDescriptor, this);
    connect(thread, SIGNAL(finished()), this, SLOT(removeThread()), 
            Qt::DirectConnection);
    m_threads.append(thread);
    thread->start();
}

void EchoServer::removeThread(){
    EchoThread *thread = qobject_cast<EchoThread*>(sender());
    m_threads.removeAt(m_threads.indexOf(thread));
    thread->deleteLater();
}