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$PostgreSQL: pgsql/contrib/dblink/doc/execute,v 1.4 2006/03/11 04:38:29 momjian Exp $
==================================================================
Name
dblink_exec -- Executes an UPDATE/INSERT/DELETE on a remote database
Synopsis
dblink_exec(text connstr, text sql [, bool fail_on_error])
dblink_exec(text connname, text sql [, bool fail_on_error])
dblink_exec(text sql [, bool fail_on_error])
Inputs
connname
connstr
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.
sql
sql statement that you wish to execute on the remote host, e.g.:
insert into foo values(0,'a','{"a0","b0","c0"}');
fail_on_error
If true (default when not present) 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 treated as a NOTICE, and the return value is set
to 'ERROR'.
Outputs
Returns status of the command, or 'ERROR' if the command failed.
Notes
1) dblink_open starts an explicit transaction. If, after using dblink_open,
you use dblink_exec to change data, and then an error occurs or you use
dblink_disconnect without a dblink_close first, your change *will* be
lost.
Example usage
select dblink_connect('dbname=dblink_test_slave');
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)
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