Incrementing a string Values in SQL Server

Hi,

How can I increment a string value as below...

CU00000001
CU00000002
CU00000003
CU00000004
CU00000005
CU00000006
CU00000007
CU00000008
CU00000009
CU00000010
CU00000011
.
.
.
CU00000019
CU00000020
.
.
.
CU00000100

How i want this is... Everytime when i insert a value I will the check the previous or highest value from the table and then I need to increment it by 1. Then I will be inserting it in the table.

Could any one help me. Thanks in advance.
LVL 14
Jagdish DevakuSr DB ArchitectAsked:
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Atdhe NuhiuCommented:
something along the lines of

declare @a as varchar(20)
declare @n as int

set @a= 'CU00000100'

set @n = cast(right(@a,8) as int)
set @n = @n+1

set @a = 'CU' + right('0000000000' + cast(@n as varchar(10)),8)
select @a
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Atdhe NuhiuCommented:
you could set something like that in a function or maybe just a stored procedure
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Jagdish DevakuSr DB ArchitectAuthor Commented:
Thanks Andycrofts... Your solution works.
Can i get any other method to do this. Which will not effect performance of the database. As we are planning to implement this in a very sensitive module.
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Atdhe NuhiuCommented:
there may be subtley different way to do it but the bottom line is you have to seperate the bit of the string that can be converted into a number for incremaentation before putting it back together.

The other way of doing it, if you can change the structure of your table so that the key is an auto incrementing identity field and you use a view to build the field that looks like 'CU00000101'

table
column id
id
1
2
3
.
.


view
define your string id as 'CU' + right('00000000' + cast(id as varchar(10)),8)


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sunil_mailsCommented:
--keep a master table "MS_Counters" with 3 columns "CtrType","Prefix" and "postfix"
--This table will allow u maintain multiple counters for multiple tables e.g. emp number, order number etc
create table MS_Counters
(CtrType varchar(10),
Prefix varchar(10),
postfix int)

--Insert dummy value for testing purpose
insert MS_Counters
values('Employee','CU',121)



begin tran -- to ensure evthing is withi transaction and to help lock hints to work

declare @MyCTR int
declare @prfx varchar(2) --, @EmpName varchar(10)

select @prfx =Prefix , @MyCTR=postfix
from MS_Counters with (readpast, updlock) --Lock hints to ensure that different connection doesn't get same number causing duplicate in main table
where CtrType='Employee' --U can decide ur own Ctr types

insert employees(Id,Name)
select @prfx + replicate('0', 8 - len(@MyCTR)) + cast(@MyCTR as varchar), @EmpName

update MS_Counters
set postfix = postfix + 1 --Increment it by 1 to ensure serial number
where CtrType='Employee'


commit tran -- Commit whole operation

Assuming this insert operation will be done in SP, it will ensure ur serial numbers are never duplicate and also it length will always be 10.


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Jagdish DevakuSr DB ArchitectAuthor Commented:
Thanks for the support.
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Atdhe NuhiuCommented:
Thanks

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Microsoft SQL Server 2005

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