Struggling to connect to the PostgreSQL database

hi everyone, I have struggled for a long time with trying to connect my progam to a PostgreSQL database. At first I tried connecting my program to a mysql database but after a long time of trying to building the mysql driver i gave up and tried a different database (i.e. Postgresql) and still can't connect even with postgresql. code below.

Code:

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Server_A::Server_A(QObject *parent) :
    QObject(parent)
{
    server = new QTcpServer(this);
   // threadPool.setMaxThreadCount(5000);
 
    QString connectionStr = "Driver={PostgreSQL};Server=127.0.0.1;Port=5432;Database=AsicamtheDB;Uid=root;Pwd=ayaman;";
 
    db = QSqlDatabase::addDatabase("QODBC");
    db.setConnectOptions();
    db.setDatabaseName(connectionStr);
 
    if(db.open())
    {
        qDebug() << "connected to database" <<endl;
    }
    else
    {
        qDebug() << "Not connected" <<endl;
        qDebug() << db.lastError() <<endl;
        qDebug() << db.drivers() <<endl;
    }

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does anyone know how to resolve this

1. Can you connect with "sqlbrowser" application from Qt examples ?
2. If you are trying to connect to PostgreSQL database, try QPSQL driver:

Code:

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db = QSqlDatabase::addDatabase("QPSQL");

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I did try PQSQL but it also doesn't work.

Ok, and what about 1) ?