( resource result )
pg_last_oid() is used to retrieve the
OID assigned to an inserted row.
OID field became an optional field from PostgreSQL 7.2 and will
not be present by default in PostgreSQL 8.1. When the
OID field is not present in a table, the programmer must use
pg_result_status() to check for successful
To get the value of a SERIAL field in an inserted
row, it is necessary to use the PostgreSQL CURRVAL
function, naming the sequence whose last value is required. If the
name of the sequence is unknown, the pg_get_serial_sequence
PostgreSQL 8.0 function is necessary.
PostgreSQL 8.1 has a function LASTVAL that returns
the value of the most recently used sequence in the session. This avoids
the need for naming the sequence, table or column altogether.
This function used to be called pg_getlastoid().