Update a composite nested type variable

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От	Luca Vernini
Тема	Update a composite nested type variable
Дата	8 июля 2013 г. 16:11:32
Msg-id	CAHZ=uVA9jV32M2NYhthHssS-Ra-ttYAkfL+OmH5D3b07gCivHg@mail.gmail.com обсуждение исходный текст
Ответы	Re: Update a composite nested type variable (David Johnston <polobo@yahoo.com>)
Список	pgsql-sql

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.

В списке pgsql-sql по дате отправления:

От: Andreas
Дата: 08 июля 2013 г., 15:17:58
Сообщение: monthly statistics

От: David Johnston
Дата: 08 июля 2013 г., 22:01:34
Сообщение: Re: Update a composite nested type variable