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| create EXTENSION dblink if not EXISTS;
select dblink_connect('dblinktest','host=192.168.8.201 dbname=hxtest user=postgres password=654321');
select dblink_get_connections();
select * from dblink('dblinktest','select gid,code from d_farmland;') as t_d_farmland(gid int,d_farmland varchar(20));
select dblink_disconnect('dblinktest');
select dblink_disconnect();
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