pg.ddx.io  pgsql-sql@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Dennis Gearon <gearond@cvc.net>
To: Robert Treat <xzilla@users.sourceforge.net>
Cc: Josh Berkus <josh@agliodbs.com>
Cc: pgsql-general@postgresql.org <pgsql-general@postgresql.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] rewriting values with before trigger
Date: Thu, 24 Apr 2003 12:10:39 -0700
Message-ID: <3EA836AF.8060704@cvc.net> (raw)
In-Reply-To: <1051209495.7747.544.camel@camel>
References: <1051201544.4753.522.camel@camel>
	<200304240939.54070.josh@agliodbs.com>
	<1051209495.7747.544.camel@camel>

How about putting the data validity and conversion routine in ONE trigger?

OR, deliberately name your triggers with alphanumerical prefixes that forces them to fire in a certain order, and making the trigger that does the conversion fire first?

I have no idea how the transport of a value of '' happens in the parser if it's expecing a NULL/INT value, if it would even make it to the trigger stage <shrug>.

Robert Treat wrote:
> On Thu, 2003-04-24 at 12:39, Josh Berkus wrote:
> 
>>Robert,
>>
>>
>>>Is there anyway to do be able to change the '' into NULL before data
>>>validity is checked with a trigger?
>>
>>What about using a RULE instead?
>>
> 
> 
> RULE's follow this same behavior, erroring out if the data is not a
> valid timestamp. (At least I've not been able to write a rule that
> doesn't follow this) In fact you actually can't create the rule if you
> have a where clause that isn't a proper matching datatype. 
> 
> I seem to recall a solution for folks who need '' to represent 0 in int
> fields was to use triggers or rules, but I guess that really isn't
> possible :-(
> 
> Robert Treat 
> 
>  
> 
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
> 
> http://www.postgresql.org/docs/faqs/FAQ.html
> 




view thread (18+ messages)  latest in thread

Message-ID: <3EA836AF.8060704@cvc.net>
Permalink:  ../3EA836AF.8060704@cvc.net/
Also on:    postgresql.org/message-id/3EA836AF.8060704@cvc.net

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-sql@postgresql.org
  Cc: gearond@cvc.net, xzilla@users.sourceforge.net, josh@agliodbs.com, pgsql-general@postgresql.org
  Subject: Re: [SQL] rewriting values with before trigger
  In-Reply-To: <3EA836AF.8060704@cvc.net>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox