public override bool Equals(object obj)
        {
            if (obj == null)
            {
                return(false);
            }

            SQLiteNullColumnConstraint dst = obj as SQLiteNullColumnConstraint;

            if (dst == null)
            {
                return(false);
            }

            if (dst._isnull != this._isnull)
            {
                return(false);
            }
            if (this._conf != dst._conf)
            {
                return(false);
            }

            return(base.Equals(obj));
        }
        public override object Clone()
        {
            SQLiteNullColumnConstraint res = new SQLiteNullColumnConstraint(this.ConstraintName);

            res._isnull = _isnull;
            res._conf   = _conf;
            return(res);
        }