建立拓展
create extension dblink;

建立連線
select dblink_connect(‘myconn’,‘dbname=dbname host=localhost user=username password=123456’);

執行跨庫查詢並與當前庫資料混合查詢
select * from manager.mediafile where personid in (select * from dblink(‘myconn’,‘select id from manager.person where statedm like ‘‘1%’’’) as t(a varchar));//

關閉連線
select dblink_disconnect(‘myconn’);

關閉拓展
drop extension dblink;