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9.1

Manual Auto-Increment

Asked by batchakamal in SQL Server 2005

I have the following INSERT trigger in a table to add the maximum number based on Center and Year for the inserted record. This table is going to hold around 2 million records. Is this a best way to do Auto-Increment.
OR
Create a Table as a ControlTable with InWardNumber as a column to hold the last number. During Insert I can get that number and add one to this IncomingItems.InWardNumber and also update the controlTable for the next Number.

Also, very importantly, how about if many users try to insert on this table? How this trigger will behave? 
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ALTER TRIGGER [InsertWithInWardNumber] ON [dbo].[IncomingItems]
For Insert
AS
declare @CustomNo nvarchar(Max)
SET @CustomNo = (SELECT InWardNumber FROM INSERTED)
IF (@CustomNo IS NULL OR ltrim(rtrim(@CustomNo)) = '')
BEGIN
	select @CustomNo = ISNULL(max(InWardNumber),0) + 1 from IncomingItems
		where IncomingItems.CenterId = (SELECT CenterId FROM INSERTED)
		and   IncomingItems.ItemYear = (SELECT ItemYear FROM INSERTED)
 
	Update dbo.IncomingItems set InWardNumber = @CustomNo
	Where InWardId = (SELECT InWardId FROM INSERTED) 
END
[+][-]11/06/09 11:55 PM, ID: 25765381Expert Comment

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[+][-]11/06/09 11:57 PM, ID: 25765387Author Comment

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[+][-]11/07/09 01:09 AM, ID: 25765526Expert Comment

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[+][-]11/08/09 02:48 AM, ID: 25770086Author Comment

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[+][-]11/08/09 04:20 AM, ID: 25770255Expert Comment

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[+][-]11/08/09 04:30 AM, ID: 25770269Author Comment

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[+][-]11/08/09 04:54 AM, ID: 25770320Accepted Solution

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About this solution

Zone: SQL Server 2005
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Solution Provided By: samijsr
Participating Experts: 3
Solution Grade: A
 
 
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