Solved

select count plus 1 and update it

Posted on 2007-12-05
8
402 Views
Last Modified: 2012-06-27
I have a record in a table and I want to create a stored procedure that when invoked it will do a select on the record and get the value of counter, increment it by one update the record and return the new value.

is this possible with a stored proc?
0
Comment
Question by:lobos
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 50 total points
ID: 20412687
yes, that is possible:


CREATE PROCEDURE dbo.GetSequence
AS
 SET NOCOUNT ON
 DECLARE @value INT
 BEGIN TRANSACTION
 SELECT @Value = yourfield + 1 FROM yourtable WHERE ...
 UPDATE yourtable SET yourfield = @value WHERE ...
 COMMIT
 SELECT @value as NewValue

Open in new window

0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 20412693
variant with output parameter:
CREATE PROCEDURE dbo.GetSequence
( @value int OUTPUT ) 
AS
 SET NOCOUNT ON
 BEGIN TRANSACTION
 SELECT @Value = yourfield + 1 FROM yourtable WHERE ...
 UPDATE yourtable SET yourfield = @value WHERE ...
 COMMIT

Open in new window

0
 
LVL 10

Expert Comment

by:lahousden
ID: 20412722
Create PROC advance_counter
@pk_col int
@new_value int = null output
AS
begin transaction
update your_table
set counter = counter + 1
where pk_col = @pk_col
select @new_value = counter
from your_table
where pk_col = @pk_col
commit transaction
0
Space-Age Communications Transitions to DevOps

ViaSat, a global provider of satellite and wireless communications, securely connects businesses, governments, and organizations to the Internet. Learn how ViaSat’s Network Solutions Engineer, drove the transition from a traditional network support to a DevOps-centric model.

 

Author Comment

by:lobos
ID: 20412866
how do I test this with query anylyser?
exec  GetSequence
Procedure 'GetSequence' expects parameter '@value', which was not supplied.

also why do I have to use an output parameter...can't I just use a select statement and then with that record I can get the value of the counter?
ie.
CREATE procedure GetSequence
as
Begin
select * from your_table      
end
GO

whats the difference, and how would I get that value if I was to use an output parameter...when using the select statement like above...I could just call and refence the column name....but not sure why and how it would be with the output parameter.
0
 
LVL 10

Expert Comment

by:lahousden
ID: 20412931
Use Angel's first response to get the value in the result set instead of an output parameter.  You haven't indicated how you are going to use this SP, so that's why a couple of different ways of doing it have been suggested.  For instance, if you are going to call this SP from another T-SQL batch or Stored Procedure then you will not be able to access the value if you just return it in a result set, but you would be able to get it from an output parameter.  If you are just going to call the SP from a Client-Side programming technology then using the Result Set version should be fine.
0
 
LVL 18

Expert Comment

by:ShogunWade
ID: 20413673
If this is SQL 2005 you could also do:

create proc usp_IncrementAndReturn @id int as
UPDATE mycol SET mycol=mycol+1 OUTPUT inserted.mycol WHERE id=@id
GO
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 20413879
the second example would be used like this in query analyser:

declare @value int
exec  GetSequence @value output
select @value result
0
 

Author Closing Comment

by:lobos
ID: 31412883
thanks
0

Featured Post

How Do You Stack Up Against Your Peers?

With today’s modern enterprise so dependent on digital infrastructures, the impact of major incidents has increased dramatically. Grab the report now to gain insight into how your organization ranks against your peers and learn best-in-class strategies to resolve incidents.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
SSIS GUID Variable 2 37
SQL Syntax 6 42
Converting Stored Procedure to SQL Statement 5 44
mysql vs miscrosoft sql server 6 20
Introduction In my previous article (http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SSIS/A_9150-Loading-XML-Using-SSIS.html) I showed you how the XML Source component can be used to load XML files into a SQL Server database, us…
Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
Via a live example, show how to setup several different housekeeping processes for a SQL Server.

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question