Message-ID: <4EFE85E9.9020602@gmail.com>
Date: Fri, 30 Dec 2011 19:47:53 -0800
From: "John L. Poole" <jlpoole56@gmail.com>
Reply-To: jlpoole56@gmail.com
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To: David Johnston <polobo@yahoo.com>
CC: pgsql-sql@postgresql.org
Subject: Re: Nested custom types: array - unable to insert [SOLVED]
References: 
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	<F0517F61-58FF-4409-87A8-00D6F566BF27@yahoo.com>
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On 12/30/2011 7:31 PM, David Johnston wrote:
> On Dec 30, 2011, at 21:53, John Poole<jlpoole56@gmail.com>  wrote:
>
>> I am trying to create a custom data type for phone numbers where
>> I have a primary phone number and then an array of additional
>> phone numbers qualified by certain types.
>>
>> Below is a set of SQL commands I used to set up my custom
>> types.  I am unable to insert into the array field and wonder
>> if I have found a bug, or I'm just missing some basic technique.
>>
>> Here is the error I receive when trying to insert into the array field:
>>
>> ERROR:  cannot cast type record[] to phonenumber_type
>> LINE 2: ...22222,'office'), (3333333,'cell'),(4444444,'eve')]::phonenum...
>>
>> Can someone provide me an example of how to insert one or more
>> records into the secondary array component of the type or provide
>> some light on creating a custom type that would hold two fields:
>> 1) a single type
>> 2) an array of types  (this field may be null)
>>
>>
>> Thank you.
>>
>> John Poole
>>
>> =================================================
>> Here is the SQL to recreate my attempt:
>> --
>> -- Creating a custom data type and inserting/updating example
>> --
>> -- create database demo_typestudy1;
>>
>> create type phoneattribute_type as ENUM
>> ('home','office','day','eve','mobile','fax');
>>
>>
>> create type phonenumber_type as
>> (numbers int,
>> phone_type phoneattribute_type
>> );
>>
>> create type contactphone_type as
>> (primarynumber phonenumber_type,
>> othernumbers phonenumber_type ARRAY
>> );
>>
>> create table people
>> (id integer PRIMARY KEY,
>> username text NOT NULL UNIQUE,
>> phone contactphone_type
>> );
>>
>> --
>> -- create a record w/o phone
>> --
>> insert into people
>> (id, username)
>> VALUES
>> (1,'bob');
>> --
>> -- add the custom data type: contactphone, just the primary and no other
>> -- we'll try adding array values later
>> --
>> update people
>> set phone = ((1234567899,'home'),NULL)
>> where id = 1;
>> --
>> -- also more qualified
>> --
>> update people
>> set phone = ROW(ROW(1234567899,'home'),NULL)
>> where id = 1;
>> --
>> -- most qualified (with casting)
>> --
>> update people
>> set phone = CAST(ROW(CAST(ROW(1234567899,'home') as phonenumber_type),NULL)
>>    as contactphone_type)
>> where id = 1;
>> --
>> -- view it
>> --
>> select phone
>> from people where id = 1;
>> --
>> -- try adding to the array field
>> -- replace the primary and add additional phone numbers
>> -- This is where things go awry.
>> --
>> update people
>> set phone = CAST(ROW(CAST(ROW(1111111,'home') as
>> phonenumber_type),ARRAY[(2222222,'office'),
>> (3333333,'cell'),(4444444,'eve')]::phonenumber_type)
>>    as contactphone_type)
>> where id = 1;
>>
>>
> ... ,ARRAY[ ... ]::phonenumber_type[]
>
> You need to cast to an array of the type which is done by adding the trailing brackets to the type.
>
> Also, your CREATE TYPE syntax (the "othernumbers phonenumber_type ARRAY" part) is something I have not yet seen.  Where did you see this? I would have expected it to read "othernumbers phonenumber_type[]"; without the word ARRAY.
>
> David J.
David et al.,
That works.

demo_typestudy1=# update people
demo_typestudy1-# set phone = CAST(ROW(CAST(ROW(1111111,'home') as 
phonenumber_type),ARRAY[(2222222,'office'), 
(3333333,'mobile'),(4444444,'eve')]::phonenumber_type[])
demo_typestudy1(# as contactphone_type)
demo_typestudy1-# where id = 1;
UPDATE 1
demo_typestudy1=#

To answer your question, I did originally try

  "othernumbers phonenumber_type[]"

but as I kept running into a wall, I figured I had not tried
a correct syntax and somewhere found the "ARRAY" syntax
as an acceptable form; I figured the more explicit, the better.
It may have been from a railroad diagram.
The type definition was accepted so I ran with it.

Thank you, I spent several hours gated by this issue, so your
insight has been a tremendous help.

John


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