Displaying the model

In the previous section, we saw how to access the database using the model as an abstraction. Now, we shall try to link it with a model for display. Using the code listing from the previous section, modify main.cpp to appear as follows:

#include <QApplication>
#include <QtSql>
#include <QVBoxLayout>
#include <QPushButton>
#include <QDebug>
#include <Qt>
#include <QTableView>
#include <QHeaderView>
int main(int argc, char *argv[])
{
   QApplication app(argc, argv);
   // Setup db connection
   QSqlDatabase db_conn =
           QSqlDatabase::addDatabase("QMYSQL", "contact_db");
   db_conn.setHostName("127.0.0.1");
   db_conn.setDatabaseName("contact_db");
   db_conn.setUserName("root");
   db_conn.setPassword("");
   db_conn.setPort(3306);
   // Error checks
   if (!db_conn...