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How can I retrieve current identity value in DB2 ?

Posted on 2003-03-27
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Last Modified: 2012-06-21
There is Built-in function for each DBMS
which is for retrieving current identity value of some table.
for example...

in oracle...

select table_name.curval from dual

in ms-sql ...

select IDENT_CURRENT('table_name')

how can I do this in DB2 ?
Is there anyway?
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Question by:ignung
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Expert Comment

by:yongsing
ID: 8221893
To obtain the last value generated, use the SYSIBM.IDENTITY_VAL_LOCAL funtion:

values(identity_val_local())

This won't yield the expected value in multi-threaded applications where multiple threads perform Inserts. Address this situation by serializing threads.

IDENTITY_VAL_LOCAL returns NULL if either a COMMIT or other queries were performed after the Insert (even if those queries did not reference the Identity column).
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Author Comment

by:ignung
ID: 8223490
Yes, I already know that function ...
but as you see...  It's result is not guarantee...
and my application is extremely multi-threaded ;-)
I should find some other way...
Anyway... I really appreciate your answer.
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yongsing earned 200 total points
ID: 8223514
Since the identity column will be incremented for each row inserted, maybe you can try using max() function on the identity column to get the latest value.

SELECT max(identity_column) from table_name

Not sure if that will work.
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