dblink_exec
dblink_exec
dblink_exec - executes a command in a remote database
Synopsis
dblink_exec(text connname, text sql [, bool fail_on_error]) returns text dblink_exec(text connstr, text sql [, bool fail_on_error]) returns text dblink_exec(text sql [, bool fail_on_error]) returns text
Description
dblink_exec
executes a command (that is, any SQL statement
that doesn't return rows) in a remote database.
When two
text
arguments are given, the first one is first
looked up as a persistent connection's name; if found, the command
is executed on that connection. If not found, the first argument
is treated as a connection info string as for
dblink_connect
,
and the indicated connection is made just for the duration of this command.
Arguments
-
connname -
Name of the connection to use; omit this parameter to use the unnamed connection.
-
connstr -
A connection info string, as previously described for
dblink_connect. -
sql -
The SQL command that you wish to execute in the remote database, for example
insert into foo values(0,'a','{"a0","b0","c0"}'). -
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's return value is set to
ERROR.
Return Value
Returns status, either the command's status string or
ERROR
.
Examples
SELECT dblink_connect('dbname=dblink_test_standby');
dblink_connect
----------------
OK
(1 row)
SELECT dblink_exec('insert into foo values(21,''z'',''{"a0","b0","c0"}'');');
dblink_exec
-----------------
INSERT 943366 1
(1 row)
SELECT dblink_connect('myconn', 'dbname=regression');
dblink_connect
----------------
OK
(1 row)
SELECT dblink_exec('myconn', 'insert into foo values(21,''z'',''{"a0","b0","c0"}'');');
dblink_exec
------------------
INSERT 6432584 1
(1 row)
SELECT dblink_exec('myconn', 'insert into pg_class values (''foo'')',false);
NOTICE: sql error
DETAIL: ERROR: null value in column "relnamespace" violates not-null constraint
dblink_exec
-------------
ERROR
(1 row)