轉儲ViewState-爲Aspx減肥(二)

 建立刪除過期狀態的存儲過程

CREATE OR REPLACE PROCEDURE Proc_Web_Clearviewstate IS
/**//******************************************************************************
   NAME:       PROC_WEB_CLEARVIEWSTATE
   PURPOSE:    

   REVISIONS:
   Ver        Date        Author           Description
   ---------  ----------  ---------------  ------------------------------------
   1.0        2006-08-10          1. Created this procedure.

   NOTES: 刪除過期的頁面狀態

   Automatically available Auto Replace Keywords:
      Object Name:     PROC_WEB_CLEARVIEWSTATE
      Sysdate:         2006-08-10
      Date and Time:   2006-08-10, 14:54:17, and 2006-08-10 14:54:17
      Username:         (set in TOAD Options, Procedure Editor)
      Table Name:       Web_ViewState
      Author: wwwfind

******************************************************************************/
BEGIN

   DELETE WEB_VIEWSTATE WHERE Create_Dte<(SYSDATE -1/48); //半個小時前的數據
   COMMIT;
   
   EXCEPTION
     WHEN NO_DATA_FOUND THEN
       NULL;
     WHEN OTHERS THEN
       -- Consider logging the error and then re-raise
       RAISE;
END Proc_Web_Clearviewstate;
/

 建立JOB

DECLARE
  X NUMBER;
BEGIN
  SYS.DBMS_JOB.SUBMIT
  ( job       => X 
   ,what      => 'PROC_WEB_CLEARVIEWSTATE;'
   ,next_date => to_date('02-09-2006 17:38:42','dd/mm/yyyy hh24:mi:ss')
   ,interval  => 'SYSDATE+30/1440 '
   ,no_parse  => FALSE
  );
END;
/

  在Base頁中插入下列代碼，其餘頁面繼承此頁即可

        ViewState To DataBase#region ViewState To DataBase
        /**//*
         wwwfind 2006/08/10
         Blog:http://blog.csdn.net/wwwfind
        處理ViewState 將ViewState保存到數據庫中，防止過大ViewState在客戶端和服務器之間來回傳遞速度過慢。
        在__VIEWSTATE只存儲一個ID，該ID爲數據庫中記錄的Primary Key
        無效的狀態由JOB定期刪除
        */
        protected override object LoadPageStateFromPersistenceMedium()
        ...{
            
            object myObj;
            if (Request.Form  == null)
            ...{
                return null;
            }
            string str_view = Request.Form["__VIEWSTATE"];

            if (str_view == null) return null;
            if (myFormat == null) myFormat=new LosFormatter();
            
            try
            ...{
                //獲取保存在__VIEWSTATE中的ID
                myObj=this.myFormat.Deserialize(str_view);
                this.ID=((Triplet)myObj).First.ToString();
                //獲取保存在數據庫中的ViewState
                myData.TableName="Web_ViewState";
                myData.Fields="ViewState_Txt";
                myData.Where="ID_STR='"+this.ID +"'";
                str_view=myData.Scalar().ToString();
                myObj = this.myFormat.Deserialize(str_view);
            }
            catch
            ...{
                throw new HttpException(("頁面狀態丟失，頁面已經過期或用戶進行非法修改。"));
            }
            return myObj;
        }

        protected override void SavePageStateToPersistenceMedium(object viewState)
        ...{
            if (myFormat == null) myFormat=new LosFormatter();
            
            //聲稱ID標識，如果ID存在默認代表在數據庫中已經成功保存該數據
            if (this.ID==null)
            ...{
                this.ID=Session.SessionID +this.GetType().Name+DateTime.Now.ToString("yyMMddhhmmss");//ID=Session ID +頁面名稱+當前時間
                //保存VIEWSTATE INSERT
                System.IO.StringWriter sw=new System.IO.StringWriter();
                this.myFormat.Serialize(sw,viewState);//序列化
                //INSERT
                myData.Command.CommandText="insert into Web_ViewState(ID_Str,ViewState_Txt,Create_Dte) values('"+this.ID+"',:viewstr,sysDate)";
                myData.Command.Parameters.Add(new System.Data.OracleClient.OracleParameter(":viewstr",sw.ToString()));
                myData.Command.Connection=myData.Connect;
                if (myData.Connect.State!=System.Data.ConnectionState.Open) myData.Connect.Open();
                myData.Command.ExecuteNonQuery(); 
            }
            else
            ...{
                //保存VIEWSTATE UPDATE
                System.IO.StringWriter sw=new System.IO.StringWriter();
                this.myFormat.Serialize(sw,viewState);//序列化
                //UPDATE
                myData.Command.CommandText="update Web_ViewState set ID_Str='"+this.ID +"',ViewState_Txt=:viewstr,Create_Dte=sysdate Where ID_STR='"+this.ID +"'";
                myData.Command.Parameters.Add(new System.Data.OracleClient.OracleParameter(":viewstr",sw.ToString()));
                myData.Command.Connection=myData.Connect;
                if (myData.Connect.State!=System.Data.ConnectionState.Open) myData.Connect.Open();
                myData.Command.ExecuteNonQuery(); 
            }
            //保存ID到默認的ViewState
            ((Triplet)viewState).First=this.ID;
            ((Triplet)viewState).Second=null;
            ((Triplet)viewState).Third=null;
            base.SavePageStateToPersistenceMedium(viewState);
            
        }
        
        //----------------------------------------------------------------------------------------------------------------------------------------------
        #endregion