Inside the database table it should be stored as
ID001
ID002
ID003
ID004
the identity thing only works in int, we are looking at varchar here
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Question
Incrementing custom IDs ( this is very urgent)
I have a table with an ID as a Primary Key. an example if thess IDs are
Id001
Id002
Id003
..
.
..
and so on
How do i get the database to increment this value automatically when i add data to the other fields in the database
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Answers
the best way is identity column as suggested by chaos_hooi
another solution:
you create a store procedure for insert.
e.g.
create procedure xyz
@param1,
.
.
@paramn
as
declare @nextid integer
select @nextid = convert(int,right(max(id),
insert into table values (@nextid, param1, ... , paramn)
note: you have to make sure that your max id is ID999
if you need bigger size, then you have to prepare from now on. e.g. ID99999
stored procedure will guarantee the id to be unique.
janithaj,
Please be aware that data does not have to be physically stored the way it is displayed. For example, if you create a genuine integer identity column, you can also create a computed (virtual) column to return the id in the format you want for display, for example:
CREATE TABLE tablex
(idNum INT IDENTITY(1,1),
id AS 'ID' + RIGHT('00'+CAST(idNum AS VARCHAR(3)), 3), ...
Then you can reference id in a SELECT, and you will get 'ID001', 'ID002', etc., even though you only have to store 1, 2, etc..
This provides one other advantage: if you later need a fourth digit, you can issue these commands:
ALTER TABLE tablex
DROP COLUMN id
ALTER TABLE tablex
ADD id AS 'ID' + RIGHT('000'+CAST(idNum AS VARCHAR(4)), 4)
and id will be changed everywhere to 'ID0001' rather than 'ID001' (provided, of course, you left enough extra space in the display field when needed).
You can use a trigger as follows:
(NOTE: my_table AND my_fld ARE YOUR TABLES AND FIELDS,
the table 'inserted' is a special table used by MS SQL for triggers.)
CREATE TRIGGER InsteadTrigger ON my_table
INSTEAD OF INSERT
AS
BEGIN
INSERT INTO my_table ([ID], my_fld_one, my_fld_two, my_fld_thr)
SELECT 'db' +
CASE LEN(convert(VARCHAR(3),RIG
WHEN 1 THEN '00' + convert(VARCHAR(3),RIGHT([
WHEN 2 THEN '0' + convert(VARCHAR(3),RIGHT([
ELSE convert(VARCHAR(3),RIGHT([
END AS [ID] FROM my_table ), I.my_fld_one, my_fld_two, my_fld_thr
FROM Inserted as I
END
Good luck
janithaj:
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by: chaos_hooiPosted on 2003-04-10 at 23:53:22ID: 8312000
Why didn't you use numbers and make the [ID] Column IDENTITY with 1 increment at the beginning?
Then, when you make queries from that tables, you can concatenate it with 'id' and 0(s) in front... It will make life easier...
Other than that, the only other thing I can think of is to use insert trigger... Maybe other people has better suggestions. ^_^