Autonomous transaction - user updating information through form

Good afternoon,
I have a form that has a database datablock that is populated using a cursor that does a select on 4 tables, being one the most important (table A). When the user is done he commits the changes and the information is saved in table B, the "source" of the datablock.
This generates a concurrency problem: if two users give the same parameters the cursor populates the same information in their respective sessions and the information is saved twice. I want to prevent this, only one person should be allowed to use the information.
I know about autonomous transactions and perhaps this is the best idea: update the status of the row in table A in order to prevent any further uses but i want to check any other solution. Perhaps i could write the user and the time and the second person would get a message: "being used by"
Thanks,

Yes i too have read about autonomous transaction and its very rare usability.
Ok here's the situation:
Table B
code_B (number) PK
code_B1 (number PK
description
selected (Y/N), default N
more fields...
Table A
code_A PK
description
code_B NOT part of PK_A
code_B1 NOT part of PK_A
more fields
step 1: user opens form X and marks some records from table B, setting selected to Y
step 2: User open forms Y and populates block Z (table A) based on a cursor (PL/sql run through a push button) that looks for all the records from B that have selected = Y
step 3: user commits and the form updates table A with new records
this is the normal procedure but sometimes two users open form Y at almost the same time and the both populate the datablock Z with the same info.
I have thought about creating a new hidden datablock in form Y that uses table B, in order to block other users.
and these forms have been like this for years now, i did not create them and the tables have millions of records now...
This was a design flaw, not taking concurrency into account i guess
Many thanks
Edited by: user474437 on Apr 17, 2010 10:38 AM

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제품 : AOL
작성날짜 : 2002-11-29
USER UPDATE가 안되는 문제 ORA-20001 ORA-06512
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