Lists: | pgsql-sql |
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From: | "David" <de4(at)kent(dot)ac(dot)uk> |
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To: | <pgsql-sql(at)postgresql(dot)org> |
Subject: | arrays and polygons |
Date: | 2004-02-13 10:25:10 |
Message-ID: | 001e01c3f21b$a8c0eb00$2d650c81@ad.kent.ac.uk |
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Lists: | pgsql-sql |
Hi there i am having problems inserting an array of polygons into a table, i
have added the column using:
ALTER TABLE species ADD COLUMN location polygon[];
this works fine, but when i try
INSERT INTO species (location) VALUES ('{((432,89), (45,87), (89,87)),
((54,78), (34,98))};
I get the following error message:
ERROR: Bad polygon external representation '((432'
Where am i going wrong, all help is much appreciated DAvid
From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | "David" <de4(at)kent(dot)ac(dot)uk> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: arrays and polygons |
Date: | 2004-02-13 15:02:39 |
Message-ID: | 2252.1076684559@sss.pgh.pa.us |
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Lists: | pgsql-sql |
"David" <de4(at)kent(dot)ac(dot)uk> writes:
> ALTER TABLE species ADD COLUMN location polygon[];
> INSERT INTO species (location) VALUES ('{((432,89), (45,87), (89,87)),
> ((54,78), (34,98))};
I think you'd need to double-quote each polygon within the array
literal.
'{"((432,89), (45,87), (89,87))", "..."}'
The array parser doesn't think parens are special, so it's not going to
magically distinguish array commas from polygon commas for you.
BTW, if you are using 7.4, the ARRAY[] constructor syntax might be
easier to use.
regards, tom lane
From: | Joe Conway <mail(at)joeconway(dot)com> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | David <de4(at)kent(dot)ac(dot)uk>, pgsql-sql(at)postgresql(dot)org |
Subject: | Re: arrays and polygons |
Date: | 2004-02-13 16:33:42 |
Message-ID: | 402CFC66.5060707@joeconway.com |
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Tom Lane wrote:
> "David" <de4(at)kent(dot)ac(dot)uk> writes:
>>INSERT INTO species (location) VALUES ('{((432,89), (45,87), (89,87)),
>>((54,78), (34,98))};
>
> I think you'd need to double-quote each polygon within the array
> literal.
>
> '{"((432,89), (45,87), (89,87))", "..."}'
>
> The array parser doesn't think parens are special, so it's not going to
> magically distinguish array commas from polygon commas for you.
>
> BTW, if you are using 7.4, the ARRAY[] constructor syntax might be
> easier to use.
FWIW, here's what it would look like in 7.4.x:
regression=# select ARRAY['((432,89), (45,87), (89,87))'::polygon,
'((432,89), (45,87), (89,87))'];
array
-------------------------------------------------------------
{"((432,89),(45,87),(89,87))","((432,89),(45,87),(89,87))"}
(1 row)
You need to explicitly cast at least the first polygon in order to get
an array of polygons (versus an array of text).
HTH,
Joe
From: | "David" <de4(at)kent(dot)ac(dot)uk> |
---|---|
To: | "Joe Conway" <mail(at)joeconway(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: arrays and polygons |
Date: | 2004-02-13 17:00:10 |
Message-ID: | 005b01c3f252$d6d59ef0$5b660c81@ad.kent.ac.uk |
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Thanks to you both that helped enormously,
Dave
----- Original Message -----
From: "Joe Conway" <mail(at)joeconway(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "David" <de4(at)kent(dot)ac(dot)uk>; <pgsql-sql(at)postgresql(dot)org>
Sent: Friday, February 13, 2004 4:33 PM
Subject: Re: [SQL] arrays and polygons
> Tom Lane wrote:
> > "David" <de4(at)kent(dot)ac(dot)uk> writes:
> >>INSERT INTO species (location) VALUES ('{((432,89), (45,87), (89,87)),
> >>((54,78), (34,98))};
> >
> > I think you'd need to double-quote each polygon within the array
> > literal.
> >
> > '{"((432,89), (45,87), (89,87))", "..."}'
> >
> > The array parser doesn't think parens are special, so it's not going to
> > magically distinguish array commas from polygon commas for you.
> >
> > BTW, if you are using 7.4, the ARRAY[] constructor syntax might be
> > easier to use.
>
> FWIW, here's what it would look like in 7.4.x:
>
> regression=# select ARRAY['((432,89), (45,87), (89,87))'::polygon,
> '((432,89), (45,87), (89,87))'];
> array
> -------------------------------------------------------------
> {"((432,89),(45,87),(89,87))","((432,89),(45,87),(89,87))"}
> (1 row)
>
> You need to explicitly cast at least the first polygon in order to get
> an array of polygons (versus an array of text).
>
> HTH,
>
> Joe
>