To: Carolyn Lu Wong <carolyn@kss.net.au>
cc: "pgsql-sql@postgresql.org" <pgsql-sql@postgresql.org>
Subject: Re: Trigger 
In-reply-to: <396F1FAA.29F680B2@kss.net.au> 
References: <396F1FAA.29F680B2@kss.net.au>
Comments: In-reply-to Carolyn Lu Wong <carolyn@kss.net.au>
	message dated "Sat, 15 Jul 2000 00:11:54 +1000"
Date: Fri, 14 Jul 2000 11:49:02 -0400
Message-ID: <11167.963589742@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>

Carolyn Lu Wong <carolyn@kss.net.au> writes:
> In the "Interaction with the Trigger Manager" from the online document,
> it states that it's for V7.1 or later. Because I'm working on earlier
> version, do I need to modify my code if the database is upgraded to
> later versions?

The trigger interface for 7.0 is the same as in 6.5, so you can rely
on the online document for now.

7.1 will have a different trigger interface (but the document hasn't
been updated yet).  The key difference is that the TriggerData structure
will be passed as a parameter rather than being pointed to by a global
variable.  You can minimize the number of changes you will need to make
by not referring to CurrentTriggerData all over the place --- instead,
copy it into a local variable at the start of your trigger function.

> I'm writing the C program in under my home directory. How can I set up
> the environment so that my program compiles?

Easiest way is to point -I at the src/include tree, I'm afraid.  There
are some examples of C triggers in the contrib/ area, take a look at
their makefiles.

			regards, tom lane