Scenerio, I have 100 records. From the stored proc (SQL 2000), I want to pull 10 records at a time in a date order. I want to mark these records so they are not pulled a second time. The below example will work, but my problem is, I have many processes calling this proc and there is a millisecond gap between the time it's inserted into @tmp and it's updated in Example. This means another process could pull the exact same data.. What I'm looking for is to update and selected the data at the same time.. Is that possible without triggers? I know I've done this before, but I think I'm having a brain fart..
create procedure [dbo].[app_Request]
as
begin
set nocount on
declare @Tmp table (
[Field1] [int] ,
[Field2] [varchar] (20) ,
[Field3] [varchar] (50) ,
[Status] [int] ,
[CreateDate] [datetime] )
insert into @tmp select top 5 [Field1], [Field2], [Field3], [Status], [CreateDate] from Example where Status=0 order by CreateDate
update Example set Status=1
from Example e
inner join @tmp t on t.Field1= e.Field1 and t.Field2=e.Field2
select * from @tmp
end
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you will have to work a bit differently.
add a column session (int) to you table; and do like this:
create procedure [dbo].[app_Request]
as
begin
set nocount on
set rowcount 5
update Example set status = 1, session = @@sid
where status = 0 and sid is null
and createdate in ( select top 5 createdate from example where status = 0 order by createdate asc )
select * from Example where status = 1 and session = @@sid
end
For angelIII's answer, you use @@SPID (not @SID) and add a new column session SMALLINT to your table.
If adding a new column to your table is not an option, you may need to adopt transaction.
But in my opinion his approach is better in term of performance / concurrency / etc.
create procedure [dbo].[app_Request]
as
begin
set nocount on
BEGIN TRAN
set rowcount 5
update e set status = 1
from (SELECT * FROM Example where status = 0 ORDER BY createdate asc) e
select * from (select * from Example where status = 1 order by createdate desc) x order by x.createdate asc
COMMIT TRAN
end
create procedure [dbo].[app_Request]
as
begin
set nocount on
set rowcount 5
update Example set status = 1, session = @@spid
where status = 0 and sid is null
and createdate in ( select top 5 createdate from example where status = 0 order by createdate asc )
select * from Example where status = 1 and session = @@spid
set rowcount 0
end
I've fixed this by creating a SPID table.. Then I just call:
declare @SPID int
EXEC @SPID = [dbo].[sp_GetSpid]
ALTER PROCEDURE [dbo].[sp_GetSpid]
AS
BEGIN
SET NOCOUNT ON
-- @@SPID wasnt working, keep returning the same ID each time,
-- even from the application, with a disconnect and reconnect.
-- So I build this function to basicly do the same thing and
-- delete the data from the database, no longer needed.
declare @SPID int
insert into SPID values (getdate())
set @SPID = SCOPE_IDENTITY()
delete SPID
return @SPID
END
This works very well.. Thanks again.
BTW.. Final product for the future viewers:
CREATE PROCEDURE [dbo].[sp_Request]
AS
BEGIN
SET NOCOUNT ON
declare @SPID int
EXEC @SPID = [dbo].[sp_GetSpid]
declare @Tmp table (
[Field1] [int] ,
[Field2] [varchar] (20) ,
[Field3] [varchar] (50) ,
[Status] [int] ,
[CreateDate] [datetime] )
update Example set Status=1, SPID=@SPID
from Example
where [Field1] in (select top 5 [Field1] from Example where Status=0 order by CreateDate)
insert into @tmp select * from Example where SPID=@SPID order by CreateDate
select * from @tmp
END
Business Accounts
Answer for Membership
by: BobLambersonPosted on 2006-08-09 at 21:57:10ID: 17285217
Maybe you want to set up transactions for each transaction?