本文主要是介绍postgresql 中的postgres_fdw，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
两台主机，192.168.11.67192.168.11.70
67机器上的
[postgres@pg contrib]$ psql
psql (9.4.4)
Type "help" for help.postgres=# select * from pg_foreign_data_wrapper;fdwname | fdwowner | fdwhandler | fdwvalidator | fdwacl | fdwoptions
--------------+----------+------------+--------------+--------+------------dblink_fdw | 10 | 0 | 16965 | | postgres_fdw | 10 | 16968 | 16969 | |
(2 rows)postgres=# \dxList of installed extensionsName | Version | Schema | Description
--------------+---------+------------+--------------------------------------------------------------dblink | 1.1 | public | connect to other PostgreSQL databases from within a databaseplpgsql | 1.0 | pg_catalog | PL/pgSQL procedural languagepostgres_fdw | 1.0 | public | foreign-data wrapper for remote PostgreSQL servers
(3 rows)postgres=# create server server_remote_70 foreign data wrapper postgres_fdw options(host '192.168.11.70',port '5432',dbname 'postgres');
CREATE SERVER
postgres=# select * from pg_foreign_server ;srvname | srvowner | srvfdw | srvtype | srvversion | srvacl | srvoptions
------------------+----------+--------+---------+------------+--------+------------------------------------------------server_remote_70 | 10 | 16970 | | | | {host=192.168.11.70,port=5432,dbname=postgres}
(1 row)postgres=# \desList of foreign serversName | Owner | Foreign-data wrapper
------------------+----------+----------------------server_remote_70 | postgres | postgres_fdw
(1 row)--for后面的postgres是本地登录执行的用户名,option里存储的是远程的用户密码
postgres=# create user mapping for postgres server server_remote_70 options(user 'postgres',password 'postgres');
CREATE USER MAPPING
postgres=# select * from pg_user_mappings;umid | srvid | srvname | umuser | usename | umoptions
-------+-------+------------------+--------+----------+-----------------------------------17022 | 17021 | server_remote_70 | 10 | postgres | {user=postgres,password=postgres}
(1 row)postgres=# \dList of relationsSchema | Name | Type | Owner
--------+---------+---------------+----------public | a | table | postgrespublic | tbl_fdw | foreign table | postgres
(2 rows)
postgres=# CREATE FOREIGN TABLE tbl_fdw(id int) server server_remote_70 options (schema_name 'public',table_name 'tb1');
CREATE FOREIGN TABLE
postgres=# select * from tbl_fdw ;id
----123
(3 rows)70中的数据
postgres=# \d tb1Table "public.tb1"Column | Type | Modifiers
--------+---------+-----------id | integer | postgres=# select * from tb1;id
----123
(3 rows)
这篇关于postgresql 中的postgres_fdw的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
