From: Richard Rowell <richard@bowmansystems.com>
To: pgsql-sql@postgresql.org
Subject: Database Upgrade scripts (AKA Conditional SQL execution)
Date: 07 Jul 2003 08:58:42 -0500
Message-ID: <1057586322.31898.18.camel@localhost> (raw)
Moving to Postgres from MS SQL server wherever I can. When writing
database upgrade scripts, it is nice to construct the script so it will
run correctly even if run twice. In MS-SQL's TSQL I would do something
like this:
IF( SELECT COUNT(*) FROM sysobjects WHERE name = 'foo' AND type ='U' ) <
1 THEN
CREATE TABLE foo()
END
Can I accomplish this with postgresql without involving an external
process (like say perl)? I guess I could put the upgrade stuff into
PL/SQL functions and just drop the functions when I'm done, but I was
hoping for something a little "cleaner".
--
Richard Rowell <richard@bowmansystems.com>
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To: pgsql-sql@postgresql.org
Cc: richard@bowmansystems.com
Subject: Re: Database Upgrade scripts (AKA Conditional SQL execution)
In-Reply-To: <1057586322.31898.18.camel@localhost>
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