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pl/proxy and sequence generation

From: Igor Katson <descentspb(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: pl/proxy and sequence generation
Date: 2008-12-24 15:18:14
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-general

The problem, i'm going to describe is about pl/proxy usage. I'll call 
the bases, which are proxied to, the node-based and the base, which 
contains pl/proxy the proxy-base.

The task, I need to accomplish, is to make an insert into node-bases, 
using the sequence, generated inside the proxy-base, as the primary key.

As far as I understand, this is not a good idea to generate the keys 
inside the node-bases, simply because the values will not be unique, 
cause they will have different sequence generators. So I decided to make 
a sequence in the proxy-base. And the sequence number should be passed 
to the node-bases as a fucntion argument. As far as I know, you should 
have the same number and types of arguments for this function both in 
the node-bases and the proxy-base. So I should have a sequence number as 
an argument in the proxy-base too.

Usually, the application calls the function in the proxy-base, and this 
function calls the same ones in the node-bases. But the application 
should not generate the sequence, and it should not pass it as an 
argument to the function.

So, should I make a wrapper in e.g. PL/pgsql for every insert function 
writen in PL/Proxy to remove the sequence from the argument list and to 
call the sequence generator?
Is there a better way to do that?

Thanks in advance,
Igor Katson.


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Subject: Re: pl/proxy and sequence generation
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