Abstract Data Access Layer Design

using System;
using System.Collections.Generic;
using System.Text;

namespace XPeriment.Persistence.PersistentObjects
{
    public class FieldMapping
    {
        private string propertyname = "";
        private string databasefield = "";
        private bool isprimarykey = false;
        private bool nullsallowed = true;
        private bool isforaignkey = false;

        public bool IsPrimaryKey
        {
            get
            {
                return isprimarykey;
            }
            set
            {
                isprimarykey = value;
            }
        }

        public bool IsForaignKey
        {
            get
            {
                return isforaignkey;
            }
            set
            {
                isforaignkey = value;
            }
        }

        public bool NullsAllowed
        {
            get
            {
                return nullsallowed;
            }
            set
            {
                nullsallowed = value;
            }
        }

        public string PropertyName
        {
            get
            {
                return propertyname;
            }
            set
            {
                propertyname = value;
            }
        }

        public string DatabaseField
        {
            get
            {
                return databasefield;
            }
            set
            {
                databasefield = value;
            }
        }

        public FieldMapping(string propertyName, string databaseField)
        {
            propertyname = propertyName;
            databasefield = databaseField;
        }

        public FieldMapping(string propertyName, string databaseField, bool isPrimaryKey)
        {
            propertyname = propertyName;
            databasefield = databaseField;
            isprimarykey = isPrimaryKey;
        }
    }
}