How to : only one user in a branch can do the batch process at a time ?

dear gurus,
In ADF web application, accessed by multiple branch (20), there is a
batch process to create invoices from orders. There are 3-5 users in a
branch. one user can process about 30 - 50 orders to become
invoices.
Business rule is : In one batch process, each users must produce
invoices with gapless invoice number. e.g : user_1 create 30 invoices
no.001 - 030, user_2 create 40 invoices no.031-070 ... and so on...
So we want to protect that at a time, in one branch, only one user can
do the batch process. User_2 must wait until user_1 is done to start
the process.
We use the table below to maintain the latest invoice number created :
CREATE TABLE doc_number
DOC_TYPE VARCHAR2(6 BYTE) NOT NULL,
BRANCH_CODE VARCHAR2(6 BYTE) NOT NULL,
DOC_NBR NUMBER(12) DEFAULT 0,
CONSTRAINT "DOC_NUMBER_PK" PRIMARY KEY (DOC_TYPE, BRANCH_CODE)
The question is :
I think of locking a spicific row of the doc_number table (select ...
for update wait 10) at the beginning of the batch process stored
procedure.
But what if the session/connection left orphan and the row is lockde
forever before the dba kill it ?
So is there a better approach to limit the user execution of the
process ?
Thank you very much for your help,
Krist

Forget it. See http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:4343369880986.
However, if you are dead set on doing this old fashioned thing of trying to emulate paper invoices from a numbered tablet, you could always just let everyone generate all of their invoices with no invoice number whenever they want, then at some time ( say 21:00 every day), take a lock on the table and apply invoice numbers to all of the records with a null invoice number -- which will take only a few centiseconds at most. And let the users/system print only invoices that have numbers assigned. This way, you pretty much eliminate the concurrency issue of various branches generating invoices only in their time window -- yuk, what an awful way to have to do business.
And completely forget about users or branches having their own range of numbers. That is completely nuts. Your database already knows which branch owns which invoice, right??

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