dblink question about duplicate connection

["francescoboccacci@xxxxxxxxx" <francescoboccacci@xxxxxxxxx>]

Dear all,
i have a question about dblink connection.I use it in a trigger function :


CREATE OR REPLACE FUNCTION setuser()
  RETURNS trigger AS
$BODY$

DECLARE

BEGIN
  IF (TG_OP = 'INSERT') THEN

     

     PERFORM dblink_connect('conn_test', 'dbname=database_test');



     PERFORM dblink_exec('conn_test','insert into users
      ......


Somentimes happend that an error accours in insert data and when i try to run 
new insert posgresql return and error like duplicate connection.
I would like to change my functions in this way:

CREATE OR REPLACE FUNCTION setuser()
  RETURNS trigger AS
$BODY$

DECLARE

BEGIN
  IF (TG_OP = 'INSERT') THEN

     If 'conn_test' exist  PERFORM dblink_disconnect('conn_test');
     else

     PERFORM dblink_connect('conn_test', 'dbname=database_test');



     PERFORM dblink_exec('conn_test','insert into users



How can write my new function?

Thanks


Francesco Boccacci

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