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AutoInc in SQL Server

Posted on 1998-08-25
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Last Modified: 2008-03-04
How can i create a field like autoincrement in Access ?
I want to have a serial number e.g. 1 to 9999999 and while appending a new record it automatically increments itself by one. I think it is done by Identity , but how? How is it used. Explanations are appreciated..
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Question by:guvencum
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7 Comments
 
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Expert Comment

by:odessa
ID: 1089757
CREATE TABLE dbo.TEST (
      ID int IDENTITY (1, 1) NOT NULL ,
..
)
GO

Where you set IDENTITY to be ID field autoincrement, first 1 stands for starting value, second for step, field must be not null
0
 

Author Comment

by:guvencum
ID: 1089758
I already created an identity field like it but, i use a TTable in Delphi and bounded it to a dbgrid. When i want to insert a record, it didn't put ID field a value. And when i post, it gave me an error "ID field must have a value". (I know it must have a value. And you were supposed to give it!...) When i identify ID field as Identity, i have to make it not null. This is why SQL Server gives error message. SQL Server must put a value in ID field automatically, and when i post it must save this autoincremented value in ID field. when i did it by a TQuery with SQL statement like this it worked "insert mytable1(name,surname) values('Izzet','Altinmese')". But when i did it by TTable, it didn't work. Now i use a dummy table to store last record's id. And i autoincrement it by myself in program. But i'm not sure if tens of people enters record, if it locks the record by itself (SQL Server), or do i have to do it by myself again ( by semaphores..etc.). If i do all these things, what will SQL Server do ?!...
0
 

Expert Comment

by:manish77
ID: 1089759
I faced a similar problem (in Visual Basic ). I solved it by using following code
begin transaction1
Begin transaction2
insert mytable1(name,surname) values('Izzet','Altinmese')
end transaction2
retrieve identity column value by using max(identity column) function and a where clause like name = "Izzet" and surname = "Altinmese"

eg. select max(identity col) from table1 where name =  "Izzet" and surname = "Altinmese"

this is not foolproof but it should work for most of the cases
if it works for you i will upgrade my comments to answer.

Best of luck,
Manish77

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Expert Comment

by:manish77
ID: 1089760
sorry for error in previos code please use this one
I faced a similar problem (in Visual Basic ). I solved it by using following code

begin transaction

insert mytable1(name,surname) values('Izzet','Altinmese')
end transaction

retrieve identity column value by using max(identity column) function and a where clause like name = "Izzet" and surname = "Altinmese"

eg. select max(identity col) from table1 where name =  "Izzet" and surname = "Altinmese"

this is not foolproof but it should work for most of the cases
if it works for you i will upgrade my comments to answer.

Best of luck,
Manish77
0
 

Author Comment

by:guvencum
ID: 1089761
It seems to work .
But It is something bring extra oversheads to the server
my application must be so optimized .
I already change my mind not to use data bounded controls and TTable.
Nevertheless thanks for your comment.
Change it to answer and let me appreciate it

best of luck
guvencum
0
 

Expert Comment

by:manish77
ID: 1089762
guvencum
Please reject the answer from Odessa and unlock this question so that I can post it as a answer.
Thanx,
Manish
0
 

Accepted Solution

by:
manish77 earned 40 total points
ID: 1089763
I faced a similar problem (in Visual Basic ). I solved it by using following code

begin transaction

insert mytable1(name,surname) values('Izzet','Altinmese')
end transaction

retrieve identity column value by using max(identity column) function and a where clause like name = "Izzet" and surname = "Altinmese"

eg. select max(identity col) from table1 where name =  "Izzet" and surname = "Altinmese"

this is not foolproof but it should work for most of the cases
if it works for you i will upgrade my comments to answer.

Best of luck,
Manish77
0

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