三层结构之数据类层

/**//// <summary>
        /// 增加一条数据
        /// </summary>
        public int Add(Maticsoft.Model.EntryLog model)
        ...{
            StringBuilder strSql=new StringBuilder();
            strSql.Append("insert into EntryLog(");
            strSql.Append("Name,LandingDate)");
            strSql.Append(" values (");
            strSql.Append("@Name,@LandingDate)");
            strSql.Append(";select @@IDENTITY");
            SqlParameter[] parameters = ...{
                    new SqlParameter("@Name", SqlDbType.VarChar,50),
                    new SqlParameter("@LandingDate", SqlDbType.DateTime)};
            parameters[0].Value = model.Name;
            parameters[1].Value = model.LandingDate;

            object obj = DbHelperSQL.GetSingle(strSql.ToString(),parameters);
            if (obj == null)
            ...{
                return 1;
            }
            else
            ...{
                return Convert.ToInt32(obj);
            }
        }
        /**//// <summary>
        /// 更新一条数据
        /// </summary>
        public void Update(Maticsoft.Model.EntryLog model)
        ...{
            StringBuilder strSql=new StringBuilder();
            strSql.Append("update EntryLog set ");
            strSql.Append("Name=@Name,");
            strSql.Append("LandingDate=@LandingDate");
            strSql.Append(" where ID=@ID ");
            SqlParameter[] parameters = ...{
                    new SqlParameter("@ID", SqlDbType.Int,4),
                    new SqlParameter("@Name", SqlDbType.VarChar,50),
                    new SqlParameter("@LandingDate", SqlDbType.DateTime)};
            parameters[0].Value = model.ID;
            parameters[1].Value = model.Name;
            parameters[2].Value = model.LandingDate;

            DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
        }

        /**//// <summary>
        /// 删除一条数据
        /// </summary>
        public void Delete(int ID)
        ...{
            StringBuilder strSql=new StringBuilder();
            strSql.Append("delete EntryLog ");
            strSql.Append(" where ID=@ID ");
            SqlParameter[] parameters = ...{
                    new SqlParameter("@ID", SqlDbType.Int,4)};
            parameters[0].Value = ID;

            DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
        }