如何在定义游标的时候使用动态sql语句

  declare @GetCaridStr   Nvarchar(1000) ;
  set @GetCaridStr = 'DECLARE  LandAreaO_Cursor CURSOR FOR  select carid from car_info where companyid not in(select companyid from company_info where list2 =543 and list3 =543 and status =1) and car_type  in ('+ @Key_CarType +')';
  Exec(@GetCaridStr) ;   
 
   OPEN LandAreaO_Cursor;
   FETCH NEXT FROM LandAreaO_Cursor INTO @CarID;
   WHILE @@FETCH_STATUS = 0
   BEGIN   
    set @LandArea = dbo.Monitor_GetArreaLand(@CarID,@queryDate);
    update landarrea set area =convert(float,@LandArea) where
    carid =@CarID and queryDate = @queryDate;
    FETCH NEXT FROM LandAreaO_Cursor INTO @CarID;   
   END
   CLOSE LandAreaO_Cursor;
   DEALLOCATE LandAreaO_Cursor;