Question

Case withing a Cursor not taking the value when Null

Asked by: GabicusC

I have a cursor that I am looping through and doing an update to a table.  What I am trying to do is when I go through the first time I put in the value.  But when I loop through the 2nd time I append the new value with the info in the cursor.  However in the case that I have written does not input the info when the field is Null the first time through.  Can someone tell me what I am doing wrong in this Case statement.

Thanks,

Gabicus

declare pkg_list cursor for
					select 	customer_no,
							order_no,
							pkg_no,
							seat_no
					from	#Pkg_Seats
 
 
 
					open pkg_list
 
					fetch		pkg_list
					into 		@customer_no,
								@order_no,
								@pkg_no,
								@seat_no
 
 
	while @@Fetch_Status = 0
		begin
 
			update r
			set r.pkg_name = pkg_s.pkg_name,
				r.Current_Seats = case r.current_seats
										when null then pkg_s.seat_row + convert(varchar(10),pkg_s.seat_num)
										else r.current_seats + ',' + pkg_s.seat_row + convert(varchar(10),pkg_s.seat_num)
									end
			from #Results as r join
				#Pkg_Seats as pkg_s
			on	r.customer_no = pkg_s.customer_no
			and	r.order_no = pkg_s.order_no
			where r.customer_no = @customer_no
 
			fetch next from pkg_list
			into	@customer_no,
					@order_no,
					@pkg_no,
					@seat_no
		end
Close pkg_list
deallocate pkg_list

                                  
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Asked On
2009-10-23 at 12:53:44ID24839252
Tags

SQL 2k5

,

t-SQL

Topics

SQL Query Syntax

,

SQL Server 2005

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: pivarPosted on 2009-10-23 at 13:05:46ID: 25648021

Hi,

Try this instead

r.Current_Seats =
case when r.current_seats is null then pkg_s.seat_row+convert(varchar(10),pkg_s.seat_num)
         else r.current_seats + ',' + pkg_s.seat_row + convert(varchar(10),pkg_s.seat_num)
end


/peter

 

by: Igor-KPosted on 2009-10-23 at 13:10:13ID: 25648068

Everythin looks ok, maybe one of other columns has nulls.
But anyway here is the alternative to a case

update r
                  set pkg_name = pkg_s.pkg_name,
                        Current_Seats = isnull(r.current_seats,'')+isnull(pkg_s.seat_row,'') + isnull(convert(varchar(10),pkg_s.seat_num),'')

                  from #Results as r join
                        #Pkg_Seats as pkg_s
                  on      r.customer_no = pkg_s.customer_no
                  and      r.order_no = pkg_s.order_no
                  where r.customer_no = @customer_no
 

 

by: GabicusCPosted on 2009-10-23 at 13:43:27ID: 25648383

Thanks for the responses.

20120131-EE-VQP-002

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