Re: [GENERAL] arrays of rows and dblink
Torsten Förtsch wrote
Hi,
we have the ROW type and we have arrays. We also can create arrays of
rows like:
select array_agg(r)
from (values (1::int, 'today'::timestamp, 'a'::text),
(2, 'yesterday', 'b')) r(a,b,c);
array_agg
---
{(1,\2014-04-30 00:00:00\,a),(2,\2014-04-29 00:00:00\,b)}
Now I want to execute that query via dblink on a remote server. How do I
specify the result type?
select tb.* from dblink( 'dbname=postgres', $$
select array_agg(r)
from (values (1::int, 'today'::timestamp, 'a'::text),
$$) tb( WHAT DO I PUT HERE? )
Thanks,
Torsten
ISTM that you have to CREATE TYPE ... as appropriate then
... tb ( col_alias type_created_above[] )
There is only so much you can do with anonymous types (which is what the ROW
construct creates; ROW is not a type but an expression anchor - like
ARRAY[...]) that tells the parser how to interpret what follows.
David J.
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Re: [GENERAL] arrays of rows and dblink
On 30/04/14 20:19, David G Johnston wrote: ISTM that you have to CREATE TYPE ... as appropriate then ... tb ( col_alias type_created_above[] ) There is only so much you can do with anonymous types (which is what the ROW construct creates; ROW is not a type but an expression anchor - like ARRAY[...]) that tells the parser how to interpret what follows. I thought so. Do I have to create the type in both databases or only on the receiving site? Thanks, Torsten -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] arrays of rows and dblink
Torsten Förtsch wrote On 30/04/14 20:19, David G Johnston wrote: ISTM that you have to CREATE TYPE ... as appropriate then ... tb ( col_alias type_created_above[] ) There is only so much you can do with anonymous types (which is what the ROW construct creates; ROW is not a type but an expression anchor - like ARRAY[...]) that tells the parser how to interpret what follows. I thought so. Do I have to create the type in both databases or only on the receiving site? No idea but it would probably be a good idea to create the type on both sides regardless of what is required. David J. -- View this message in context: http://postgresql.1045698.n5.nabble.com/arrays-of-rows-and-dblink-tp5802035p5802054.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] arrays of rows and dblink
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Hash: SHA1
On 04/30/2014 12:52 PM, Torsten Förtsch wrote:
Hi,
we have the ROW type and we have arrays. We also can create arrays
of rows like:
select array_agg(r) from (values (1::int, 'today'::timestamp,
'a'::text), (2, 'yesterday', 'b')) r(a,b,c); array_agg
---
{(1,\2014-04-30 00:00:00\,a),(2,\2014-04-29 00:00:00\,b)}
Now I want to execute that query via dblink on a remote server. How
do I specify the result type?
select tb.* from dblink( 'dbname=postgres', $$ select array_agg(r)
from (values (1::int, 'today'::timestamp, 'a'::text), $$) tb( WHAT
DO I PUT HERE? )
select * from dblink('dbname=test',$$select array_agg(r) from (values
(1::int, 'today'::timestamp, 'a'::text), (2, 'yesterday', 'b'))
r(a,b,c)$$) as d(f text[]);
f
- ---
{(1,\2014-04-30 00:00:00\,a),(2,\2014-04-29 00:00:00\,b)}
(1 row)
HTH,
Joe
- --
Joe Conway
credativ LLC: http://www.credativ.us
Linux, PostgreSQL, and general Open Source
Training, Service, Consulting, 24x7 Support
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