Thursday, October 8, 2009

How do I get the IDENTITY / AUTONUMBER value for the row I inserted?

To get the indentity value of table we can use any of these:

1) INDENT_CURRENT : - IDENT_CURRENT returns the last identity value generated for a specific table in any session and any scope.
 
SELECT IDENT_CURRENT(’tablename’):- It returns the last IDENTITY value produced in a table, regardless of the connection that created the value, and regardless of the scope of the statement that produced the value.IDENT_CURRENT is not limited by scope and session; it is limited to a specified table. IDENT_CURRENT returns the identity value generated for a specific table in any session and any scope.

2) @@IDENTITY :- @@IDENTITY returns the last identity value generated for any table in the current session, across all scopes.
       
SELECT @@IDENTITY :- It returns the last IDENTITY value produced on a connection, regardless of the table that produced the value, and regardless of the scope of the statement that produced the value.@@IDENTITY will return the last identity value entered into a table in your current session. While @@IDENTITY is limited to the current session, it is not limited to the current scope. If you have a trigger on a table that causes an identity to be created in another table, you will get the identity that was created last, even if it was the trigger that created it.



3) SCOPE_IDENTITY :-  SCOPE_IDENTITY returns the last identity value generated for any table in the current session and the current scope.

SELECT SCOPE_IDENTITY() :- It returns the last IDENTITY value produced on a connection and by a statement in the same scope, regardless of the table that produced the value.SCOPE_IDENTITY(), like @@IDENTITY, will return the last identity value created in the current session, but it will also limit it to your current scope as well. In other words, it will return the last identity value that you explicitly created, rather than any identity that was created by a trigger or a user defined function.


Examaple of each:

Create Table #Table
(
    Id int identity(1,1),
    [name] varchar(10)
)
insert into #Table
select 'P'

insert into #Table
select 'S'

insert into #Table
select 'G'

insert into #Table
select 'PP'


select * From #Table

Select  @@Identity As InsertId,IDENT_CURRENT('#Table') As InsertId,SCOPE_IDENTITY() As InsertId

Drop table #Table


------------------------------------------
Note : To avoid the potential problems associated with adding a trigger later on, always use SCOPE_IDENTITY() to return the identity of the recently added row in your T SQL Statement or Stored Procedure.

No comments:

Post a Comment

Ideal SQL Query For Handling Error & Transcation in MS SQL

BEGIN TRY BEGIN TRAN --put queries here COMMIT; END TRY BEGIN CATCH IF @@TRANCOUNT>0 BEGIN SELECT @@ERROR,ERRO...