postgresql fdw 安装使用

本地编译安装fdw插件

cd contrib/postgres_fdw
USE_PGX=1  make install

本地安装extension

postgres=# create extension if not exists postgres_fdw;
CREATE EXTENSION
postgres=# \dx
                               List of installed extensions
     Name     | Version |   Schema   |                    Description
--------------+---------+------------+----------------------------------------------------
 plpgsql      | 1.0     | pg_catalog | PL/pgSQL procedural language
 postgres_fdw | 1.0     | public     | foreign-data wrapper for remote PostgreSQL servers
(2 rows)

本地配置server

postgres=# create server postgres_fdwtest  FOREIGN data wrapper postgres_fdw  OPTIONS(host '127.0.0.1', port '5432', dbname 'postgres');
CREATE SERVER
postgres=# create user mapping for postgres server postgres_fdwtest options(user 'postgres',password 'postgres');
CREATE USER MAPPING

本地建外表

postgres=# create foreign table pg_fdw_test(id int,name text) server postgres_fdwtest options (table_name 'pg_fdw_test');
CREATE FOREIGN TABLE

远端建表

postgres=# create  table pg_fdw_test(id int,name text);
CREATE TABLE

本地更新，查询外表

postgres=# insert into pg_fdw_test values(1,'test');
INSERT 0 1
postgres=# select * from pg_fdw_test;
 id | name
----+------
  1 | test
(1 rows)

远端查询

postgres=# select * from pg_fdw_test;
 id | name
----+------
  1 | test
(1 row)

postgres=# drop foreign table pg_fdw_test;
DROP FOREIGN TABLE
drop server postgres_fdwtest CASCADE;