Re: Can pessimistic locking be emulated? - Mailing list pgsql-hackers

From Josh Berkus
Subject Re: Can pessimistic locking be emulated?
Date
Msg-id 200302271516.40835.josh@agliodbs.com
Whole thread Raw
In response to Can pessimistic locking be emulated?  ("Merlin Moncure" <merlin.moncure@rcsonline.com>)
List pgsql-hackers
Merlin,

Just as a suggestion:  In most of my applications, we have a security layer
which is implemented through server-side functions.  These functions keep a
table updated which contains:

lock_table
record_id
lock_user
time_locked

This allows us to avoid nasty "your update cannot be processed"-type error
messages by showing the user up front which records are locked, as well as
allowing the admin to decide when locks should "time out".

I tend to find in general that database locking mechanisms are a very poor
locking strategy for a good UI.

--
Josh Berkus
josh@agliodbs.com
Aglio Database Solutions
San Francisco


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