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dblink_close
SELECT dblink_open(’foo’, ’select proname, prosrc from pg_proc’);
dblink_open
-------------
OK
(1 row)
SELECT dblink_close(’foo’);
dblink_close
--------------
OK
(1 row)
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dblink_get_connections
Name
dblink_get_connections — returns the names of all open named dblink connections
Synopsis
dblink_get_connections() returns text[]
Description
dblink_get_connections
returns an array of the names of all open named
dblink
connections.
Return Value
Returns a text array of connection names, or NULL if none.
Examples
SELECT dblink_get_connections();
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dblink_error_message
Name
dblink_error_message — gets last error message on the named connection
Synopsis
dblink_error_message(text connname) returns text
Description
dblink_error_message
fetches the most recent remote error message for a given connection.
Arguments
connname
Name of the connection to use.
Return Value
Returns last error message, or an empty string if there has been no error in this connection.
Examples
SELECT dblink_error_message(’dtest1’);
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dblink_send_query
Name
dblink_send_query — sends an async query to a remote database
Synopsis
dblink_send_query(text connname, text sql) returns int
Description
dblink_send_query
sends a query to be executed asynchronously, that is, without immediately
waiting for the result. There must not be an async query already in progress on the connection.
After successfully dispatching an async query, completion status can be checked with
dblink_is_busy
,and the results are ultimately collected with
dblink_get_result
.It is also
possible to attempt to cancel an active async query using
dblink_cancel_query
.
Arguments
connname
Name of the connection to use.
sql
The SQL statement that you wish to execute in the remote database, for example
select
*
from pg_class
.
Return Value
Returns 1 if the query was successfully dispatched, 0 otherwise.
Examples
SELECT dblink_send_query(’dtest1’, ’SELECT
*
FROM foo WHERE f1 < 3’);
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dblink_is_busy
Name
dblink_is_busy — checks if connection is busy with an async query
Synopsis
dblink_is_busy(text connname) returns int
Description
dblink_is_busy
tests whether an async query is in progress.
Arguments
connname
Name of the connection to check.
Return Value
Returns 1 if connection is busy, 0 if it is not busy. If this function returns 0, it is guaranteed that
dblink_get_result
will not block.
Examples
SELECT dblink_is_busy(’dtest1’);
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dblink_get_notify
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 and NOTIFY.
Arguments
connname
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)
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dblink_get_result
Name
dblink_get_result — gets an async query result
Synopsis
dblink_get_result(text connname [, bool fail_on_error]) returns setof record
Description
dblink_get_result
collects the results of an asynchronous query previously sent with
dblink_send_query
.If the query is not already completed,
dblink_get_result
will wait until
it is.
Arguments
connname
Name of the connection to use.
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 NO-
TICE, and the function returns no rows.
Return Value
For an async query(that is, a SQL statementreturning rows), the functionreturns therow(s) produced
by the query. To use this function, you will need tospecify the expected setof columns, as previously
discussed for
dblink
.
For an async command(that is, a SQL statement notreturning rows), the function returns a single row
with a single text column containing the command’s status string. It is still necessary to specify that
the result will have a single text column in the calling
FROM
clause.
Notes
This function must be called if
dblink_send_query
returned 1. It must be called once for each
query sent, and one additional time to obtain an empty set result, before the connection can be used
again.
When using
dblink_send_query
and
dblink_get_result
, dblink fetches the entire remote
query resultbefore returning any of it to the local queryprocessor. If the queryreturns a large number
of rows, this can result in transient memory bloat in the local session. It may be better to open such
2774
dblink_get_result
a query as a cursor with
dblink_open
and then fetch a manageable number of rows at a time.
Alternatively, use plain
dblink()
,whichavoids memory bloat by spooling large result sets todisk.
Examples
contrib_regression=# SELECT dblink_connect(’dtest1’, ’dbname=contrib_regression’);
dblink_connect
----------------
OK
(1 row)
contrib_regression=# SELECT
*
FROM
contrib_regression-# dblink_send_query(’dtest1’, ’select
*
from foo where f1 < 3’) AS t1;
t1
----
1
(1 row)
contrib_regression=# SELECT
*
FROM dblink_get_result(’dtest1’) AS t1(f1 int, f2 text, f3 text[]);
f1 | f2 |
f3
----+----+------------
0 | a
| {a0,b0,c0}
1 | b
| {a1,b1,c1}
2 | c
| {a2,b2,c2}
(3 rows)
contrib_regression=# SELECT
*
FROM dblink_get_result(’dtest1’) AS t1(f1 int, f2 text, f3 text[]);
f1 | f2 | f3
----+----+----
(0 rows)
contrib_regression=# SELECT
*
FROM
contrib_regression-# dblink_send_query(’dtest1’, ’select
*
from foo where f1 < 3; select
t1
----
1
(1 row)
contrib_regression=# SELECT
*
FROM dblink_get_result(’dtest1’) AS t1(f1 int, f2 text, f3 text[]);
f1 | f2 |
f3
----+----+------------
0 | a
| {a0,b0,c0}
1 | b
| {a1,b1,c1}
2 | c
| {a2,b2,c2}
(3 rows)
contrib_regression=# SELECT
*
FROM dblink_get_result(’dtest1’) AS t1(f1 int, f2 text, f3 text[]);
f1 | f2 |
f3
----+----+---------------
7 | h
| {a7,b7,c7}
8 | i
| {a8,b8,c8}
9 | j
| {a9,b9,c9}
10 | k
| {a10,b10,c10}
(4 rows)
2775
dblink_get_result
contrib_regression=# SELECT
*
FROM dblink_get_result(’dtest1’) AS t1(f1 int, f2 text, f3 text[]);
f1 | f2 | f3
----+----+----
(0 rows)
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dblink_cancel_query
Name
dblink_cancel_query — cancels anyactive query on the named connection
Synopsis
dblink_cancel_query(text connname) returns text
Description
dblink_cancel_query
attempts to cancel any query that is in progress on the named connection.
Note that this is not certain to succeed (since, for example, the remote query might already have
finished). A cancel request simply improves the odds that the query will fail soon. You must still
complete the normal queryprotocol, for example by calling
dblink_get_result
.
Arguments
connname
Name of the connection to use.
Return Value
Returns
OK
if the cancel request has been sent, or the text of an error message on failure.
Examples
SELECT dblink_cancel_query(’dtest1’);
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