RowDataGateway

using System;
using System.Collections.Generic;
using System.Data.OleDb;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CRUDDummyAccessConsole3a
{
    class User
    {
        private OleDbConnection aConnection;

        private string table = "users";

        public int Id { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        public string Email { get; set; }

        public void Find(int id)
        {
            // Hydration
            OleDbDataReader aReader = null;
            OleDbCommand aCommand = new OleDbCommand("SELECT * FROM users WHERE id = @par1", aConnection);
            aCommand.Parameters.AddWithValue("@par1", 1);
            try
            {
                aConnection.Open();
                aReader = aCommand.ExecuteReader();
                // Console.WriteLine("This is the returned data from users table");
                this.Id = aReader.GetInt32(0);
                this.Username = aReader.GetString(1);
                this.Password = aReader.GetString(2);
                this.Email = aReader.GetString(3);
                aReader.Close();
                aConnection.Close();
            }
            catch (OleDbException e)
            {
                Console.WriteLine("Error {0}", e.Errors[0].Message);
            }
            finally
            {
                aReader.Close();
                aConnection.Close();
            }
        }
        public int Save()
        {
            int numberOfRows = 0;
            OleDbCommand aCommand = null;
            try
            {
                aConnection.Open();
                // SQL Injection
                // OleDbCommand aCommand = new OleDbCommand("UPDATE users SET username = 'updatedUsername' WHERE ID = " + ID, aConnection);
                if (this.Id != 0)
                {
                    aCommand = new OleDbCommand("UPDATE users SET username = 'updatedUsername' WHERE ID = @par1", aConnection);
                    aCommand.Parameters.AddWithValue("@par1", Id);
                }
                else
                {
                    aCommand = new OleDbCommand("INSERT INTO users (username, `password`, email) VALUES ('О''Харра','insertedPass', 'inserted@gmail.com')", aConnection);
                }
                    // 1. approach with AddWithValue
                    // aCommand.Parameters.AddWithValue("@par1", ID);
                    // or
                    // 2.
                aCommand.Parameters.AddRange(new[] {
                         new OleDbParameter("@par2", Username),
                         new OleDbParameter("@par3", Password),
                         new OleDbParameter("@par4", Email)
                    });
                numberOfRows = aCommand.ExecuteNonQuery();
                Console.WriteLine("The number of rows during Update were {0}", numberOfRows);
                aConnection.Close();
            }
            catch (OleDbException e)
            {
                Console.WriteLine("Error {0}", e.Errors[0].Message);
            }
            finally
            {
                aConnection.Close();
            }
            return numberOfRows;
        }

        public bool HasIdentity()
        {
            return true;
        }


    }
}