/// <summary>
 /// 更新一条数据
 /// </summary>
 public int Update(Model.Left_Model model)
 {
     return(leftdal.Update(model));
 }
 /// <summary>
 /// 增加一条数据
 /// </summary>
 public int Add(Model.Left_Model model)
 {
     return(leftdal.Add(model));
 }