PostgreSQL 8.3beta4 Documentation | ||||
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dblink(text connstr, text sql [, bool fail_on_error]) dblink(text connname, text sql [, bool fail_on_error]) dblink(text sql [, bool fail_on_error])
If two arguments are present, the first is first assumed to be a specific connection name to use. If the name is not found, the argument is then assumed to be a valid connection string, of standard libpq format, e.g.: "hostaddr=127.0.0.1 dbname=mydb user=postgres password=mypasswd" If only one argument is used, then the unnamed connection is used.
select * from dblink('dbname=postgres','select proname, prosrc from pg_proc') as t1(proname name, prosrc text) where proname like 'bytea%'; proname | prosrc ------------+------------ byteacat | byteacat byteaeq | byteaeq bytealt | bytealt byteale | byteale byteagt | byteagt byteage | byteage byteane | byteane byteacmp | byteacmp bytealike | bytealike byteanlike | byteanlike byteain | byteain byteaout | byteaout (12 rows) select dblink_connect('dbname=postgres'); dblink_connect ---------------- OK (1 row) select * from dblink('select proname, prosrc from pg_proc') as t1(proname name, prosrc text) where proname like 'bytea%'; proname | prosrc ------------+------------ byteacat | byteacat byteaeq | byteaeq bytealt | bytealt byteale | byteale byteagt | byteagt byteage | byteage byteane | byteane byteacmp | byteacmp bytealike | bytealike byteanlike | byteanlike byteain | byteain byteaout | byteaout (12 rows) select dblink_connect('myconn','dbname=regression'); dblink_connect ---------------- OK (1 row) select * from dblink('myconn','select proname, prosrc from pg_proc') as t1(proname name, prosrc text) where proname like 'bytea%'; proname | prosrc ------------+------------ bytearecv | bytearecv byteasend | byteasend byteale | byteale byteagt | byteagt byteage | byteage byteane | byteane byteacmp | byteacmp bytealike | bytealike byteanlike | byteanlike byteacat | byteacat byteaeq | byteaeq bytealt | bytealt byteain | byteain byteaout | byteaout (14 rows)
A more convenient way to use dblink may be to create a view:
create view myremote_pg_proc as select * from dblink('dbname=postgres','select proname, prosrc from pg_proc') as t1(proname name, prosrc text);
Then you can simply write:
select * from myremote_pg_proc where proname like 'bytea%';