Re: consulta basica

Moises Silva escribió:
>
> Hola lista, tengo la siguiente duda, como se debe hacer una sentencia
> SQL para manejar 2 tablas en distintas bases de datos.
>
> Se agradece los comentarios y opiniones
>
> Saludos Cordiales
>
> *Moisés Silva Cárdenas
> CADE Informatica
> Plaza Venezuela esq. Loayza No 1401
> La Paz- Bolivia
> ( Telefono: (591-2) 2310390
> 2 Fax: (591-2) 2391139*
> *e-mail: msilva(at)cadebsa(dot)com*
>
>
Esto lo puedes hacer con dblink, conectándote directo a la otra base de
datos, o montando la tabla remota como si fuera otra tabla de tu base de
datos.
Aquí te dejo el ejemplo de la documentación oficial. Espero que te sirva
de algo.

Saludos
**************************************************

select dblink_connect(’dbname=postgres’);
dblink_connect
----------------
OK
(1 row)
select dblink_connect(’myconn’, ’dbname=postgres’);
dblink_connect
----------------
OK
(1 row)
-- FOREIGN DATA WRAPPER functionality
-- Note: local connection must require password authentication for this
to work properl
-- Otherwise, you will receive the following error from
dblink_connect():
--
----------------------------------------------------------------------
-- ERROR: password is required
-- DETAIL: Non-superuser cannot connect if the server does not
request a passwor
-- HINT: Target server’s authentication method must be changed.
CREATE USER dblink_regression_test WITH PASSWORD ’secret’;
CREATE FOREIGN DATA WRAPPER postgresql VALIDATOR postgresql_fdw_validator;
CREATE SERVER fdtest FOREIGN DATA WRAPPER postgresql OPTIONS (hostaddr
’127.0.0.1’, dbn
CREATE USER MAPPING FOR dblink_regression_test SERVER fdtest OPTIONS
(user ’dblink_regr
GRANT USAGE ON FOREIGN SERVER fdtest TO dblink_regression_test;
GRANT SELECT ON TABLE foo TO dblink_regression_test;
\set ORIGINAL_USER :USER
\c - dblink_regression_test
SELECT dblink_connect(’myconn’, ’fdtest’);
dblink_connect
----------------
1899
dblink_connect
OK
(1 row)
SELECT * FROM dblink(’myconn’,’SELECT * FROM foo’) AS t(a int, b text, c
text[]);
a | b | c
----+---+---------------
0 | a | {a0,b0,c0}
1 | b | {a1,b1,c1}
2 | c | {a2,b2,c2}
3 | d | {a3,b3,c3}
4 | e | {a4,b4,c4}
5 | f | {a5,b5,c5}
6 | g | {a6,b6,c6}
7 | h | {a7,b7,c7}
8 | i | {a8,b8,c8}
9 | j | {a9,b9,c9}
10 | k | {a10,b10,c10}
(11 rows)
\c - :ORIGINAL_USER
REVOKE USAGE ON FOREIGN SERVER fdtest FROM dblink_regression_test;
REVOKE SELECT ON TABLE foo FROM dblink_regression_test;
DROP USER MAPPING FOR dblink_regression_test SERVER fdtest;
DROP USER dblink_regression_test;
DROP SERVER fdtest;
DROP FOREIGN DATA WRAPPER postgresql;

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Ing. Marcos Luís Ortíz Valmaseda
PostgreSQL SysDBA && Rails Developer
BI and DWH Apprentice
Centro de Tecnologías de Almacenamiento y Análisis de Datos (CENTALAD)
Universidad de las Ciencias Informáticas (http://www.uci.cu)

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