From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
---|---|
To: | peterw(at)borstad(dot)com |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Proper entry of polygon type data |
Date: | 2009-03-25 16:06:43 |
Message-ID: | b42b73150903250906q11714e2dyc3b3a8ea406786ef@mail.gmail.com |
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Lists: | pgsql-general |
On Mon, Mar 23, 2009 at 2:13 PM, Peter Willis <peterw(at)borstad(dot)com> wrote:
> For example:
> I have a triangle with vertex corners A, B, C.
>
> One entry per vertex format suggests
>
> INSERT INTO my_table (my_polygon_column)
> VALUES ( ((Ax,Ay),(Bx,By),(Cx,Cy)) );
>
>
> One entry per edge format suggests
>
> INSERT INTO my_table (my_polygon_column)
> VALUES ( ((Ax,Ay),(Bx,By),(Bx,By),(Cx,Cy),(Cx,Cy),(Ax,Ay)) );
>
> Which entry format is the correct one?
>
> If per vertex format is the correct one, do I need to
> 'close' the path by entering the first vertex again at the end of the
> list?
the documentation
(http://www.postgresql.org/docs/8.3/interactive/datatype-geometric.html#AEN5582)
shows that you are inserting a sequence of vertexes. Also, it is
stated that the polygon is closed, which implies that you don't need
to close it yourself.
merlin
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