Thank you, i will try this, honestly i was checking if PGResult is NULL, when i trigger the exception i always get NULL so i did not any further but i will try this .....
Thank you Alvaro, i m afraid ereport seems to be the way, that it is complicated to catch this error code in the code of the caller. cause you have to use a callback etc etc
a query that triggers ereport(ERROR,....) should return a PGresult* that you pass to PQresultStatus(), which should indicate PGRES_FATAL_ERROR, so you then call PQresultErrorField(PGresult, PG_DIAG_SQLSTATE) to get back the SQLSTATE code.
-- john r pierce 37N 122W somewhere on the middle of the left coast