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Re: Undoing a typo?

From: Garrett Bladow <bbladow(at)sendit(dot)nodak(dot)edu>
To: Steven Ames <steve(at)virtual-voodoo(dot)com>
Cc: pgsql-novice <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Undoing a typo?
Date: 2002-12-10 17:02:01
Message-ID: Pine.LNX.4.21.0212101055350.8878-100000@imap2.sendit.nodak.edu (view raw or flat)
Thread:
Lists: pgsql-novice
The clever way is called a transaction.
Before doing any data manipulation, start a transaction.
Like this:
BEGIN;	http://developer.postgresql.org/docs/postgres/sql-begin.html

Then do your update statements;

Then if there was an error type:
ROLLBACK; http://developer.postgresql.org/docs/postgres/sql-rollback.html
This will revert you data back to the state it was in before the transaction.

If there wasn't an error and the data looks sound type:
COMMIT; http://developer.postgresql.org/docs/postgres/sql-commit.html
and the updates will be saved.

-- Garrett Bladow

---- This is what you wrote me ----

:This is a truly novice question but here goes:
:
:Yesterday I was on the command line and issued an UPDATE command. Right after I hit the ENTER key I realized that I forgot to put the WHERE clause in... so... every entry in the table got the update. Ooops. Since I hadn't updated this particular table in a while I just dropped it and put it back in from a backup.
:
:My question is... is there a clever way to undo or rollback a mistake you make at the 'psql' prompt? 
:
:-Steve
:


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