==================================================================
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)
