QPSQL and failed connection

[quickNitin]

I am trying to open a database through Qt . Here is the code.

inline bool createConnection()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL");
         db.setHostName("localhost");
db.setDatabaseName("/home/pgdata/data1");
    db.setUserName("pgdata");
    db.setPassword("krajesh");
 
    if (!db.open()) {
        QMessageBox::warning(0, QObject::tr("Database Error"),
                             db.lastError().text());
        return false;
    }
    return true;
}

inline bool createConnection()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QPSQL");
         db.setHostName("localhost");
db.setDatabaseName("/home/pgdata/data1");
    db.setUserName("pgdata");
    db.setPassword("krajesh");

    if (!db.open()) {
        QMessageBox::warning(0, QObject::tr("Database Error"),
                             db.lastError().text());
        return false;
    }
    return true;
}

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it results in the error. FATAL: coulfd't coonnect to database /home/pgdata/data1.
/home/pgdata/data1 do exists. It is a cluster of database inside it i had created one with default name pgdata. but opening it also results in same name. I can acess and query over it using psql from command prompt. Also same code with QMYSQL works well.

quickNitin