primary expression before '.'

hi to all, I've centos 7.5 as client and centos 6.10 as mysql server in VM. I am trying to compile a simple program to login in MySQL server as follows :-

Code:

---

void MyMainWindow::on_pushButtonLogin_clicked()
{
    QString user = ui->lineEditUserName->text().trimmed();
    QString passwd = ui->lineEditPassword->text().trimmed();
 
    db = connDB.connectDB(db, &user, &passwd);// <- here is problem 
 
    if(db->open())
    {
        QMessageBox::information(this, "Login", " Connection Succeeded");
    }
    else
    {
        QMessageBox::warning(this, "Login", "Coneection failure : " +db->lastError().text());
    }
}

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here connDB is class and having a static member function connectDB(QSqldatabase *db, QString *user, QString *passwd).
error is :-

Code:

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mymainwindow.cpp:34: error: expected primary-expression before '.' token
in     db = connDB.connectDB(db, &user, &passwd);

---

code for connectDB :-

Code:

---

QSqlDatabase * connDB::connectDB(QSqlDatabase *db, QString *uname, QString *passwd )
{
    db->setDatabaseName("cbs");
    db->setHostName("serverora11gr2.db.net");
    db->setUserName(*uname);
    db->setPassword(*passwd);
    db->setPort(3306);
    return db;
}

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how to resolve this error.

Code:

---

db = connDB::connectDB(db, &user, &passwd);

---

Read about the basics of C++.

thanks a lot , you solved my problem.