Re: dblink question please

Frankie Lam wrote:
> Does anyone know if there's a simple way that let dblink function calls in a
> plpgsql function wouldn't raise exception, in case there's sth wrong.
> (e.g. cannot connect to the remote host ......)

Not without hacking dblink.c.

At quick glance it looks like it might be reasonably safe to use
dblink_connect with the lines:

8<---------------------------------
if (PQstatus(persistent_conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(persistent_conn));
PQfinish(persistent_conn);
persistent_conn = NULL;
elog(ERROR, "dblink_connect: connection error: %s", msg);
}
8<---------------------------------

changed to something like (untested)

8<---------------------------------
if (PQstatus(persistent_conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(persistent_conn));
PQfinish(persistent_conn);
persistent_conn = NULL;
elog(NOTICE, "dblink_connect: connection error: %s", msg);
result_text = DatumGetTextP(DirectFunctionCall1(textin,
CStringGetDatum("ERROR")));
PG_RETURN_TEXT_P(result_text);
}
8<---------------------------------

It would be more complex if you want to not use the persistent connection.

HTH,

Joe