Cache缓存

         /// <summary>
         /// 根据某字段 从缓存中 查询所有未删除经排序后的实例集合
         /// </summary>
         /// <param name="type">实例的类型</param>
         /// <param name="fieldStr">字段字符串：“CourseId=1" </param>
         /// <param name="fieldValue">该字段的值：1</param>
         /// <param name="status">状态：1正常，2禁用，3删除</param>
         /// <param name="fieldOrder">排序字段："NO"</param>
         /// <returns>从缓存中 查询所有未删除经排序后的实例集合</returns>
         public List<object> SelectModelByCacleByField(Type type, string fieldStr, object fieldValue, long status, string fieldOrder)
         {
             string className = type.Name;
             string cacle_key = className + fieldValue;
             List<object> list = (List<object>)HttpRuntime.Cache[cacle_key];
             if (list==null || list.Count <= 0) //如果缓存中没有就从DB中获取
             {
                 List<object> listDB = new MyORM_BLL().SelectModelByField(type, fieldStr, status, fieldOrder);
                 if (listDB.Count > 0) //把数据库中获得的数据进行缓存
                 {
                     int ModelCache = Convert.ToInt32(ConfigurationManager.AppSettings["ModelCache"]);
                     HttpRuntime.Cache.Insert(cacle_key, listDB, null, DateTime.Now.AddSeconds(ModelCache), TimeSpan.Zero);
                 }
                 list = listDB;
             }
             return list;
         }

         /// <summary>
         /// 根据ID 从缓存中 查询未删除的实例
         /// </summary>
         /// <param name="type">实例类型</param>
         /// <param name="status">状态：1正常，2禁用，3删除</param>
         /// <param name="id">实例ID</param>
         /// <returns>从缓存中 查询未删除的实例</returns>
         public object SelectModelByCacheById(Type type, long status, int id)
         {
             string className = type.Name;
             string cacle_key = className + id;
             object obj = (object)HttpRuntime.Cache[cacle_key];
             if (obj == null) //如果缓存中没有就从DB中获取
             {
                 object objDB = new MyORM_BLL().SelectModelById(type, status, id);
                 if (objDB != null) //把数据库中获得的数据进行缓存
                 {
                     int ModelCache = Convert.ToInt32(ConfigurationManager.AppSettings["ModelCache"]);
                     HttpRuntime.Cache.Insert(cacle_key, objDB, null, DateTime.Now.AddSeconds(ModelCache), TimeSpan.Zero);
                 }
                 obj = objDB;
             }
             return obj;
         }