Date: Mon, 8 Jul 2013 12:01:25 -0700 (PDT)
From: David Johnston <polobo@yahoo.com>
To: pgsql-sql@postgresql.org
Message-ID: <1373310085989-5763082.post@n5.nabble.com>
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 <CAHZ=uVA9jV32M2NYhthHssS-Ra-ttYAkfL+OmH5D3b07gCivHg@mail.gmail.com>
References: 
 <CAHZ=uVA9jV32M2NYhthHssS-Ra-ttYAkfL+OmH5D3b07gCivHg@mail.gmail.com>
Subject: Re: Update a composite nested type variable
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Luca Vernini wrote
> I'm writing a system with havy use of composite types.
> I have a doubt.
> 
> I'm writing all in functions with language plpgsql.
> When I read a field from a composite type I must write something like
> this:
> status = ((in_customer.customer_data).customer_status).status_id
> 
> And this works fine. I need to enclose the base type, but this is not a
> problem.
> 
> When I need to assign a value I try to write something like:
> (in_customer.customer_data).field_a := NULL;
> 
> But postgresql rise an error:
> ERROR: syntax error at or near "("
> SQL state: 42601
> 
> If I dont use parentesis I rise a different error:
> 
> ERROR: "in_customer.customer_data.field_a" is not a known variable
> SQL state: 42601
> 
> 2 questions:
> Why is the behavior so different in read and in assign.
> How can I workaround this and update my values?
> 
> Luca.

This may be a pl/pgsql limitation but you should probably provide a complete
self-contained example with your attempt so that user-error can be
eliminated.

David J.


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