public string getData()
  {    List<PivotData> PivotDataList=new List<PivotData>();
   List<OpportunityLineItem> OppList=[Select Opportunity.Account.Name,Opportunity.StageName,Opportunity.CloseDate,
   Opportunity.Amount,Opportunity.RecordTypeID,CurrencyISOCode,Expected_Total_Price__c,Opportunity.IsClosed, Quantity,
   Opportunity.Name,PriceBookEntry.Product2.Name,Opportunity.Probability,PriceBookEntry.Product2.Description from OpportunityLineItem 
   WHERE Opportunity.OwnerID =: UserInfo.getUserId() AND Opportunity.IsClosed = FALSE ];
       for(OpportunityLineItem o :OppList)
       {
           PivotData p=new PivotData();
           p.AccountName=o.Opportunity.Account.Name;
           p.StageName=o.Opportunity.StageName;
           p.Year=string.valueof(o.Opportunity.CloseDate.Year());
           p.Quarter=string.valueof(o.Opportunity.CloseDate.FiscalQuarter());
           p.CurrencyCode=o.Opportunity.CurrencyISOCode;
           p.ExpectedTotalPrice=o.Expected_Total_Price__c;
           p.OpportunityName=o.Opportunity.Name;
           p.ItemNumber=o.PriceBookEntry.Product2.Name;
           p.Probability=o.Opportunity.Probability;
           p.ItemDescription=o.PriceBookEntry.Product2.Description;
           p.Quantity=o.Quantity;
           
           PivotDataList.add(p);
           
       }
       getPivot='visibility: visible';
       exportPdf=false;
       return JSON.serialize(PivotDataList);
  }