Address Book using C++ and SQLite Program

/////////////////////////
//HEADERS AND CONSTANTS//
/////////////////////////

#include <iostream>
#include <sstream>
#include "sqlite3.h"
#define DB "adbook.db"
using namespace std;

////////////////
//DB Variables//
////////////////

bool isOpenDB = false;
sqlite3 *db;
char *sql;
char *zErrMsg = 0;
int  rc;

//////////////////////////
//DB Function Prototypes//
//////////////////////////

static int callback(void *NotUsed, int argc, char **argv, char **azColName){
   int i;
   for(i=0; i<argc; i++){
      printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
   }
   printf("\n");
   return 0;
}

bool ConnectDB();
void DisconnectDB();
void InsertDB(unsigned long long,string,int,string,long int);

/////////////////
// MAIN PROGRAM//
/////////////////

int main()
{
    ConnectDB();

    cout << "Cool this works yey! \n";

    unsigned long long phone;
    long int zipcode;
    int age;
    string name,address;

    cout << "Enter NAME: ";
    cin >> name;
    cout << "Enter PHONE NUMBER: ";
    cin >> phone;
    cout << "Enter ADDRESS: ";
    cin >> address;
    cout << "Enter ZIP CODE: ";
    cin >> zipcode;
    cout << "Enter AGE: ";
    cin >> age;

    InsertDB(phone,name,age,address,zipcode);

    DisconnectDB();
}

///////////////////////
//FUNCTION DEFINITION//
///////////////////////

bool ConnectDB()
{
    int con;
    con = sqlite3_open(DB, &db);
    if ( con == SQLITE_OK )
    {
                cout << "Connected Successful" << endl;
                isOpenDB = true;


            /* Creating the SQL Statement to Crate a Table */

            sql = "CREATE TABLE IF NOT EXISTS ADBOOK("  \
                 "PHONE     BIGINT     PRIMARY KEY NOT NULL," \
                 "NAME      TEXT    NOT NULL," \
                 "AGE       INT     NOT NULL," \
                 "ADDRESS   CHAR(50)," \
                 "ZIPCODE   MEDIUMINT );";

            /* Execute SQL statement */

            rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);

        /*
        ---SYNTAX for sqlite3_exec()---

        int sqlite3_exec(
        sqlite3*,                                  An open database
        const char *sql,                           SQL to be evaluated
        int (*callback)(void*,int,char**,char**),  Callback function
        void *,                                    1st argument to callback
        char **errmsg                              Error msg written here
        );
        */


            if( rc != SQLITE_OK ){
                cout << "SQL error: " << zErrMsg;
                sqlite3_free(zErrMsg);
            }
            else{
                cout << "Table created successfully\n";
                return true;
            }
    }

    else
    {
        cout << "Connection failed " << endl;
        return false;
    }

  }

void InsertDB(unsigned long long phone,string name,int age,string address,long int zipcode)
{
    stringstream insert;
    insert << "INSERT INTO ADBOOK (PHONE,NAME,AGE,ADDRESS,ZIPCODE) VALUES (" << phone << ",'" << name << "'," << age << ",'" << address << "'," << zipcode << " ); ";
    sql = insert.str();


    /* Create SQL statement */

    sql = "INSERT INTO ADBOOK (PHONE,NAME,AGE,ADDRESS,ZIPCODE) "  \
         "VALUES (@phone, @name, @age, @address, @zipcode ); ";

    /* Execute SQL statement */
   rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
   if( rc != SQLITE_OK ){
      fprintf(stderr, "SQL error: %s\n", zErrMsg);
      sqlite3_free(zErrMsg);
   }else{
      fprintf(stdout, "Records created successfully\n");
   }
   return;

}

void DisconnectDB ()
{
    if (isOpenDB == true)
    {
        sqlite3_close(db);
        cout << "Disconnection Successful" << endl;
    }
    else
    {
        cout << "Nope Nope Nope" << endl;
    }
}