dblink_get_notify(3) [centos man page]

DBLINK_GET_NOTIFY(3)					  PostgreSQL 9.2.7 Documentation				      DBLINK_GET_NOTIFY(3)

NAME

       dblink_get_notify - retrieve async notifications on a connection

SYNOPSIS

       dblink_get_notify() returns setof (notify_name text, be_pid int, extra text)
       dblink_get_notify(text connname) returns setof (notify_name text, be_pid int, extra text)

DESCRIPTION

       dblink_get_notify retrieves notifications on either the unnamed connection, or on a named connection if specified. To receive notifications
       via dblink, LISTEN must first be issued, using dblink_exec. For details see LISTEN(7) and NOTIFY(7).

ARGUMENTS

       conname
	   The name of a named connection to get notifications on.

RETURN VALUE

       Returns setof (notify_name text, be_pid int, extra text), or an empty set if none.

EXAMPLES

	   SELECT dblink_exec('LISTEN virtual');
	    dblink_exec
	   -------------
	    LISTEN
	   (1 row)

	   SELECT * FROM dblink_get_notify();
	    notify_name | be_pid | extra
	   -------------+--------+-------
	   (0 rows)

	   NOTIFY virtual;
	   NOTIFY

	   SELECT * FROM dblink_get_notify();
	    notify_name | be_pid | extra
	   -------------+--------+-------
	    virtual	|   1229 |
	   (1 row)

PostgreSQL 9.2.7						    2014-02-17						      DBLINK_GET_NOTIFY(3)

DBLINK_FETCH(3) 					  PostgreSQL 9.2.7 Documentation					   DBLINK_FETCH(3)

NAME

       dblink_fetch - returns rows from an open cursor in a remote database

SYNOPSIS

       dblink_fetch(text cursorname, int howmany [, bool fail_on_error]) returns setof record
       dblink_fetch(text connname, text cursorname, int howmany [, bool fail_on_error]) returns setof record

DESCRIPTION

       dblink_fetch fetches rows from a cursor previously established by dblink_open.

ARGUMENTS

       conname
	   Name of the connection to use; omit this parameter to use the unnamed connection.

       cursorname
	   The name of the cursor to fetch from.

       howmany
	   The maximum number of rows to retrieve. The next howmany rows are fetched, starting at the current cursor position, moving forward.
	   Once the cursor has reached its end, no more rows are produced.

       fail_on_error
	   If true (the default when omitted) then an error thrown on the remote side of the connection causes an error to also be thrown locally.
	   If false, the remote error is locally reported as a NOTICE, and the function returns no rows.

RETURN VALUE

       The function returns the row(s) fetched from the cursor. To use this function, you will need to specify the expected set of columns, as
       previously discussed for dblink.

NOTES

       On a mismatch between the number of return columns specified in the FROM clause, and the actual number of columns returned by the remote
       cursor, an error will be thrown. In this event, the remote cursor is still advanced by as many rows as it would have been if the error had
       not occurred. The same is true for any other error occurring in the local query after the remote FETCH has been done.

EXAMPLES

	   SELECT dblink_connect('dbname=postgres');
	    dblink_connect
	   ----------------
	    OK
	   (1 row)

	   SELECT dblink_open('foo', 'select proname, prosrc from pg_proc where proname like ''bytea%''');
	    dblink_open
	   -------------
	    OK
	   (1 row)

	   SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
	    funcname |	source
	   ----------+----------
	    byteacat | byteacat
	    byteacmp | byteacmp
	    byteaeq  | byteaeq
	    byteage  | byteage
	    byteagt  | byteagt
	   (5 rows)

	   SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
	    funcname  |  source
	   -----------+-----------
	    byteain   | byteain
	    byteale   | byteale
	    bytealike | bytealike
	    bytealt   | bytealt
	    byteane   | byteane
	   (5 rows)

	   SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
	     funcname  |   source
	   ------------+------------
	    byteanlike | byteanlike
	    byteaout   | byteaout
	   (2 rows)

	   SELECT * FROM dblink_fetch('foo', 5) AS (funcname name, source text);
	    funcname | source
	   ----------+--------
	   (0 rows)

PostgreSQL 9.2.7						    2014-02-17							   DBLINK_FETCH(3)