Accessing a database form another database

On Mon, Aug 10, 2009 at 10:48:10AM -0600, Bill Thoen wrote:

I've got some GIS tables that I want to use across several projects
and currently I've got each project in a separate database. So say
I've got two databases, one for the Spacely Sprookets project and
one for the Cogswell Cogs contract, but I want to access my
WorldMap tables in my GIS database to make maps for both of these
projects. How do I reference a table that's in another database?
Or should I organize my PostgreSQL data differently?

That last is much easier. Create a schema each for Spacely and
Cogswell, then one for WorldMap.

http://www.postgresql.org/docs/current/static/sql-createschema.html

Cheers,
David.
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Bill Thoen wrote:

I've got some GIS tables that I want to use across several projects and
currently I've got each project in a separate database. So say I've got
two databases, one for the Spacely Sprookets project and one for the
Cogswell Cogs contract, but I want to access my WorldMap tables in my
GIS database to make maps for both of these projects. How do I
reference a table that's in another database? Or should I organize my
PostgreSQL data differently?

You can use dblink for this purpose:

http://www.postgresonline.com/journal/index.php?/archives/44-Using-DbLink-to-access-other-PostgreSQL-Databases-and-Servers.html

--
Guy Rouillier

Just a thought, but would it not be possible to add a trigger written in
python that makes a connection to another database and does what it needs
to? I have not done this, but if it is possible it should solve your problem
and one that I have. It should allow updates and selects.

I am sure the docs will tell you how to do perl or python based triggers and
if you can use external modules in them...if you can, it would be a rather
straight forward python app that accesses the GIS tables using a DB
connector (postgres or mysql or what ever).

Since I have not read much (more or less nothing) about triggers I could be
way off base and entirely wrong.

Thanks,
Kobus

2009/8/10 Guy Rouillier <guyr-ml1@burntmail.com>