PostgreSQL中使用dblink实现跨库查询的方法

select dblink_get_connections()

select dblink_disconnect()

select dblink_disconnect('test')

select dblink_connect('test','host=localhost dbname=cbe_sta user=postgres password=lifc126820');

select dblink_connect('host=localhost dbname=cbe_userdata user=postgres password=lifc126820');

select A.id,A.code as poicode,A.cname,A.geo,A.x,A.y,A.s01,A.s02,A.s03,A.updatetime,A.tbcode,D.code,D.data,D.value,D.cname as colname,D.ifdata,D.sort from tb_test_poi A inner join ((select * from dblink('select poicode,code,data,value from tb_test_data_poi') as T1(poicode character varying(50),code character varying(50),data double precision,value character varying(500))) B inner join (select * from dblink('select cname,code as code1,ifdata,sort from tb_test_index_poi') as T2(cname character varying(200),code1 character varying(50),ifdata character varying(5),sort character varying(50))) C on B.code=C.code1) D on A.code=D.poicode;

CREATE OR REPLACE VIEW vw_test_poi AS
 SELECT a.id, a.code AS poicode, a.cname, a.geo, a.x, a.y, a.s01, a.s02, a.s03,
  a.updatetime, a.tbcode, d.code, d.data, d.value, d.cname AS colname,
  d.ifdata, d.sort
  FROM tb_test_poi a
  JOIN (( SELECT t1.poicode, t1.code, t1.data, t1.value
      FROM dblink('host=localhost dbname=cbe_userdata user=postgres password=lifc126820'::text, 'select poicode,code,data,value from tb_test_data_poi'::text) t1(poicode character varying(50), code character varying(50), data double precision, value character varying(500))) b
  JOIN ( SELECT t2.cname, t2.code1, t2.ifdata, t2.sort
      FROM dblink('host=localhost dbname=cbe_userdata user=postgres password=lifc126820'::text, 'select cname,code as code1,ifdata,sort from tb_test_index_poi'::text) t2(cname character varying(200), code1 character varying(50), ifdata character varying(5), sort character varying(50))) c ON b.code::text = c.code1::text) d ON a.code::text = d.poicode::text;