Oracle-L: SQL question

From: Rick Stephenson <RStephenson_at_Ovid.com>
Date: Mon, 24 Feb 2003 11:49:54 -0800
Message-ID: <F001.005573CB.20030224114954@fatcity.com>

OS: Solaris 2.8

Database: Oracle 9.2.0.2

Situation in chronological order

Connection A: select * from table A where id = 1; Result: no rows returned
-- This means I need to insert the row, as it does not exists yet.

Connection B: select * from table A where id = 1; Result: no rows returned
-- This means I need to insert the row, as it does not exists yet.

Connection A: insert into table A(id) values = 1; Result: 1 row inserted

Connection B: insert into table A(id) values = 1; Result: Unique constraint violated -- This is the problem. How do I avoid this happening?

Question: How can I force connection B to wait for connection A to insert the new row before it does the select?

If I were updating the row, I could use the "for update" clause to force the wait. Is there a clean way to do that for an insert?

Thanks for your help,

Rick Stephenson

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Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Rick Stephenson
INET: RStephenson_at_Ovid.com

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